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Komatsu WD600-6 Wheel Dozer Service Repair Manual (SN 55001 and up)

Service Repair Manual

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Komatsu WD600-6 Wheel Dozer Service Repair Manual (SN 55001 and up)

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  1. SEN04979-04 WD600-6 WHEEL DOZER 55001 SERIAL NUMBERS and up

  2. 100 Index SEN04981-04 Table of contents Table of contents 1 00 Index and foreword 100 Index Composition of shop manual......................................................................................................................... Table of contents........................................................................................................................................... 200 Foreword and general information Safety notice ................................................................................................................................................. How to read the shop manual....................................................................................................................... Explanation of terms for maintenance standard............................................................................................ Handling of electric equipment and hydraulic component............................................................................. Handling of connectors newly used for engines............................................................................................ How to read electric wire code...................................................................................................................... Precautions when carrying out operation...................................................................................................... Method of disassembling and connecting push-pull type coupler................................................................. Standard tightening torque table ................................................................................................................... Conversion table ........................................................................................................................................... SEN04981-04 2 4 SEN04982-00 2 7 9 11 20 23 26 29 32 36 01 Specification 100 Specification and technical data Specification dimension drawing................................................................................................................... Specifications................................................................................................................................................ Weight table .................................................................................................................................................. Table of fuel, coolant and lubricants.............................................................................................................. SEN04984-00 2 3 6 8 10 Structure, function and maintenance standard 100 Engine and cooling system Engine mount and transmission mount......................................................................................................... Damper ......................................................................................................................................................... Cooling system.............................................................................................................................................. Cooling fan pump.......................................................................................................................................... Cooling fan motor.......................................................................................................................................... 201 Power train, Part 1 Power train.................................................................................................................................................... Power train system diagram.......................................................................................................................... Torque converter and transmission piping diagram ...................................................................................... Torque converter........................................................................................................................................... Modulation clutch.......................................................................................................................................... Torque converter regulator valve................................................................................................................... Transmission................................................................................................................................................. Transfer......................................................................................................................................................... Transmission control valve............................................................................................................................ ECMV............................................................................................................................................................ Main relief valve and torque converter relief valve........................................................................................ Lubrication relief valve .................................................................................................................................. 202 Power train, Part 2 Torque converter oil cooler............................................................................................................................ Torque converter oil filter............................................................................................................................... Drive shaft..................................................................................................................................................... Center support .............................................................................................................................................. Axle............................................................................................................................................................... Differential..................................................................................................................................................... Limited slip differential................................................................................................................................... Final drive...................................................................................................................................................... 300 Steering system Steering piping diagram ................................................................................................................................ Steering column ............................................................................................................................................ SEN04986-00 2 4 6 10 18 SEN04987-00 2 3 4 6 15 16 18 38 40 42 49 51 SEN04988-00 2 3 5 8 10 14 23 28 SEN04989-00 2 4 00-100 4 WD600-6

  3. 100 Index SEN04981-04 Table of contents Joystick steering lever linkage....................................................................................................................... Joystick EPC valve........................................................................................................................................ Lock valve...................................................................................................................................................... Steering valve................................................................................................................................................ Rotary valve................................................................................................................................................... Steering control valve.................................................................................................................................... 14 Two-way restrictor valve................................................................................................................................ 30 Stop valve...................................................................................................................................................... 31 Steering pump ............................................................................................................................................... 32 Steering cylinder............................................................................................................................................ 46 Emergency steering piping diagram.............................................................................................................. 47 Diverter valve................................................................................................................................................. 48 Emergency steering pump............................................................................................................................. 56 400 Brake system Brake piping diagram..................................................................................................................................... Brake............................................................................................................................................................. Brake valve.................................................................................................................................................... Accumulator charge valve............................................................................................................................. 16 EPC relief valve............................................................................................................................................. 22 Accumulator (for brake)................................................................................................................................. 24 Slack adjuster................................................................................................................................................ 26 Parking brake ................................................................................................................................................ 30 Parking brake solenoid valve......................................................................................................................... 32 Emergency parking brake release valve ....................................................................................................... 34 Brake cooling pump....................................................................................................................................... 35 500 Undercarriage and frame Axle mount..................................................................................................................................................... Center hinge pin............................................................................................................................................ 601 Hydraulic system, Part 1 Hydraulic piping diagram............................................................................................................................... Work equipment control lever linkage ........................................................................................................... Hydraulic tank................................................................................................................................................ Work equipment pump .................................................................................................................................. 602 Hydraulic system, Part 2 Control valve.................................................................................................................................................. CLSS............................................................................................................................................................. 16 Functions and operation by valve.................................................................................................................. 20 Accumulator (for PPC circuit)........................................................................................................................ 30 Triple pump.................................................................................................................................................... 31 700 Work equipment Work equipment linkage................................................................................................................................ Cutting edge and end bit ............................................................................................................................... Work equipment lubrication........................................................................................................................... Hydraulic cylinder.......................................................................................................................................... 10 800 Cab and its attachments ROPS cab...................................................................................................................................................... Air conditioner................................................................................................................................................ 901 Electrical system, Part 1 Machine monitor system................................................................................................................................ Machine monitor............................................................................................................................................ 902 Electrical system, Part 2 Work equipment control system .................................................................................................................... Transmission controller system..................................................................................................................... 28 903 Electrical system, Part 3 Electric transmission control.......................................................................................................................... Engine starting/stopping circuit...................................................................................................................... Parking brake circuit...................................................................................................................................... 5 6 7 8 11 SEN04990-00 2 4 8 SEN04991-00 2 7 SEN04992-00 2 4 6 8 SEN04993-00 2 SEN04994-00 2 5 7 SEN04995-00 2 4 SEN04996-01 2 8 SEN04997-00 2 SEN04998-01 2 4 7 00-100 5 WD600-6

  4. 100 Index SEN04981-04 Table of contents Sensor........................................................................................................................................................... VHMS controller related................................................................................................................................ Electric lever (Work equipment).................................................................................................................... 11 31 37 20 Standard value table 100 Standard service value table Standard service value table for engine........................................................................................................ Standard service value table for chassis....................................................................................................... SEN05044-00 2 3 30 Testing and adjusting 101 Testing and adjusting, Part 1 Tools for testing, adjusting, and troubleshooting........................................................................................... Sketches of special tools............................................................................................................................... Measuring engine speed............................................................................................................................... Measuring exhaust gas color........................................................................................................................ Measuring exhaust temperature ................................................................................................................... Adjusting valve clearance ............................................................................................................................. Testing compression pressures..................................................................................................................... Measuring blow-by pressure......................................................................................................................... Measuring engine oil pressure...................................................................................................................... Testing EGR valve and bypass valve drive oil pressure ............................................................................... Measuring intake air (boost) pressure........................................................................................................... Handling fuel system equipment................................................................................................................... Releasing residual pressure in fuel system................................................................................................... Testing fuel pressures................................................................................................................................... Testing return rate and leakage..................................................................................................................... Bleeding air from fuel circuit.......................................................................................................................... Testing leakage in fuel system...................................................................................................................... Handling reduced cylinder mode operation................................................................................................... Handling no-injection cranking operation...................................................................................................... Handling controller voltage circuit ................................................................................................................. Replacing and adjusting alternator and air conditioner compressor belt tension.......................................... Adjusting modulation clutch speed sensor and speed sensor...................................................................... Measuring directional lever and gear shift lever (Steering wheel specification)............................................ Testing and adjusting power train oil pressure.............................................................................................. Flushing procedure for torque converter and transmission hydraulic circuit................................................. Method of moving machine when transmission valve is broken................................................................... Moving method of machine disabled by short-to-power failure in work equipment potentiometer................ Adjusting steering stop valve ........................................................................................................................ 102 Testing and adjusting, Part 2 Measuring operating effort of AJSS lever (AJSS specification) .................................................................... Testing and adjusting AJSS lever angle sensor and frame angle sensor (AJSS specification).................... Testing and adjusting steering stopper bolt (AJSS specification).................................................................. Testing and adjusting steering wheel (Steering wheel specification) ............................................................ Testing steering oil pressure ......................................................................................................................... Bleeding air from steering cylinder circuit ..................................................................................................... Testing hydraulic drive fan............................................................................................................................. Bleeding air from hydraulic drive fan circuit .................................................................................................. Measuring brake pedal.................................................................................................................................. Measuring brake performance...................................................................................................................... Testing and adjusting accumulator charge pressure..................................................................................... Testing wheel brake oil pressure................................................................................................................... Measuring wear of wheel brake disc............................................................................................................. Bleeding air from wheel brake circuit............................................................................................................ Releasing residual pressure in brake accumulator circuit............................................................................. Testing parking brake performance............................................................................................................... Measuring parking brake oil pressure........................................................................................................... SEN05045-01 3 8 9 11 12 14 16 19 20 21 23 24 24 25 26 29 31 32 32 33 34 35 37 38 52 54 56 58 SEN05046-00 3 4 6 8 10 14 15 18 20 21 22 24 26 27 28 29 30 00-100 6 WD600-6

  5. 100 Index SEN04981-04 Table of contents Testing wear of parking brake disc ................................................................................................................ 33 Method of releasing parking brake manually................................................................................................. 34 Measuring and adjusting work equipment control lever ................................................................................ 35 Measuring work equipment oil pressure........................................................................................................ 36 Bleeding air from work equipment circuit....................................................................................................... 41 Moving machine for removing operator cab.................................................................................................. 42 Preparations for work on troubleshooting of electric system......................................................................... 44 Procedure for testing diodes.......................................................................................................................... 48 103 Testing and adjusting, Part 3 Machine monitor-based adjustment at replacement, disassembly and assembly, and additional installation for each sensor and controller........................................................................ Special functions of machine monitor (EMMS).............................................................................................. 104 Testing and adjusting, Part 4 VHMS controller initial setting procedure ...................................................................................................... Precautions for replacing VHMS controller.................................................................................................... 24 Pm-clinic inspection table.............................................................................................................................. 30 SEN05047-02 2 5 SEN05048-01 2 40 Troubleshooting 100 Failure code table and fuse locations Failure codes list............................................................................................................................................ Fuse locations ............................................................................................................................................... 14 200 General information on troubleshooting Points to remember when troubleshooting.................................................................................................... Sequence of events in troubleshooting ......................................................................................................... Testing before troubleshooting ...................................................................................................................... Classification and procedures of troubleshooting.......................................................................................... Information contained in troubleshooting table.............................................................................................. Phenomena looking like troubles and troubleshooting Nos........................................................................... Connection table for connector pin numbers................................................................................................. 10 T- branch box and T- branch adapter table ................................................................................................... 46 301 Troubleshooting by failure code (Display of code), Part 1 Failure code [1500L0] (TORQFLOW transmission: Double meshing) .......................................................... Failure code [15B0NX] (Transmission filter: Clogged)................................................................................... Failure code [15SAL1] (ECMV F clutch: When command current is OFF, fill signal is ON).......................... Failure code [15SALH] (ECMV F clutch: When command current is ON, fill signal is OFF)......................... Failure code [15SBL1] (ECMV R clutch: When command current is OFF, fill signal is ON).......................... 10 Failure code [15SBLH] (ECMV R clutch: When command current is ON, fill signal is OFF)......................... 12 Failure code [15SEL1] (ECMV (1): When command current is OFF, fill signal is ON) .................................. 14 Failure code [15SELH] (ECMV (1): When command current is ON, fill signal is OFF) ................................. 16 Failure code [15SFL1] (ECMV (2): When command current is OFF, fill signal is ON) .................................. 18 Failure code [15SFLH] (ECMV (2): When command current is ON, fill signal is OFF) ................................. 20 Failure code [15SGL1] (ECMV (3): When command current is OFF, fill signal is ON).................................. 22 Failure code [15SGLH] (ECMV (3): When command current is ON, fill signal is OFF)................................. 24 Failure code [15SHL1] (ECMV (4): When command current is OFF, fill signal is ON).................................. 26 Failure code [15SHLH] (ECMV (4): When command current is ON, fill signal is OFF)................................. 28 Failure code [15W0NT] (Transmission modulation clutch: Overheating) ...................................................... 30 Failure code [2F00MA] (Parking brake: Malfunction).................................................................................... 31 Failure code [2G42ZG] (Front accumulator: Low oil pressure) ..................................................................... 34 302 Troubleshooting by failure code (Display of code), Part 2 Failure code [2G43ZG] (Rear accumulator: Low oil pressure)...................................................................... Failure code [A000N1] (or VHMS_LED display: “n2” o “01”) (Engine: Overrun).......................................... Failure code [AA1ANX] (Air cleaner: Clogging)............................................................................................. Failure code [AB00L6] (Alternator: Signal disagrees with operating state of engine) ................................... 10 Failure code [AB00MA] (Alternator: Malfunction).......................................................................................... 12 Failure code [B@BAZG] (Engine oil pressure: Low error)............................................................................. 14 Failure code [B@BAZK] (Engine oil: Low level)............................................................................................ 15 Failure code [B@BCNS] (Engine coolant temperature: Overheating)........................................................... 16 SEN05049-00 2 SEN05050-00 2 3 4 5 6 8 SEN05051-00 2 4 6 8 SEN05052-00 4 6 8 00-100 7 WD600-6

  6. 100 Index SEN04981-04 Table of contents Failure code [B@BCZK] (Coolant: Low level)............................................................................................... Failure code [B@C7NS] (Brake oil: Overheating)......................................................................................... Failure code [b@CENS] (Torque converter oil: Overheating)....................................................................... Failure code [B@CENS] (Torque converter oil: Overheating)....................................................................... Failure code [B@GAZK] (Battery electrolyte: Low level) .............................................................................. Failure code [B@HANS] (Hydraulic oil: Overheating)................................................................................... Failure code [CA111] (Abnormality in engine controller)............................................................................... Failure code [CA115] (Engine Ne or Bkup speed sensor error).................................................................... Failure code [CA122] (Charge (boost) pressure sensor high error).............................................................. Failure code [CA123] (Charge (boost) pressure sensor low error)............................................................... Failure code [CA131] (Throttle sensor high error)......................................................................................... Failure code [CA132] (Throttle sensor low error).......................................................................................... Failure code [CA135] (Engine oil pressure sensor high error)...................................................................... Failure code [CA141] (Engine oil pressure sensor low error) ....................................................................... Failure code [CA144] (Coolant temperature sensor high error).................................................................... Failure code [CA145] (Coolant temperature sensor low error) ..................................................................... Failure code [CA153] (Charge (boost) temperature sensor high error) ........................................................ Failure code [CA154] (Charge (boost) temperature sensor low error).......................................................... Failure code [CA187] (Sensor power supply 2 low error) ............................................................................. Failure code [CA212] (Engine oil temperature sensor high error)................................................................. Failure code [CA213] (Engine oil temperature sensor low error).................................................................. Failure code [CA221] (Atmospheric pressure sensor high error).................................................................. Failure code [CA222] (Atmospheric pressure sensor low error)................................................................... Failure code [CA227] (Sensor power supply 2 high error)............................................................................ 303 Troubleshooting by failure code (Display of code), Part 3 Failure code [CA234] (Engine overspeed).................................................................................................... Failure code [CA238] (Ne speed sensor power supply error)....................................................................... Failure code [CA263] (Fuel temperature sensor high error) ......................................................................... Failure code [CA265] (Fuel temperature sensor low error)........................................................................... Failure code [CA271] (PCV1 Short circuit).................................................................................................... Failure code [CA272] (PCV1 Disconnection)................................................................................................ Failure code [CA273] (PCV2 Short circuit).................................................................................................... Failure code [CA274] (PCV2 Disconnection)................................................................................................ Failure code [CA322] (Injector #1 open/short error)...................................................................................... Failure code [CA323] (Injector #5 open/short error)...................................................................................... Failure code [CA324] (Injector #3 open/short error)...................................................................................... Failure code [CA325] (Injector #6 open/short error)...................................................................................... Failure code [CA331] (Injector #2 open/short error)...................................................................................... Failure code [CA332] (Injector #4 open/short error)...................................................................................... Failure code [CA342] (Calibration code inconsistency) ................................................................................ Failure code [CA351] (Injectors drive circuit error)........................................................................................ Failure code [CA352] (Sensor power supply 1 low error) ............................................................................. Failure code [CA386] (Sensor power supply 1 high error)............................................................................ Failure code [CA431] (Idle validation switch error) ....................................................................................... Failure code [CA432] (Idle validation action error)........................................................................................ Failure code [CA441] (Battery voltage low error).......................................................................................... Failure code [CA442] (Battery voltage high error)......................................................................................... Failure code [CA449] Common rail pressure high error 2............................................................................. Failure code [CA451] (Common rail pressure sensor high error) ................................................................. Failure code [CA452] (Common rail pressure sensor low error)................................................................... Failure code [CA553] (Common rail pressure high error 1).......................................................................... Failure code [CA554] (Common rail pressure sensor in range error)........................................................... Failure code [CA559] (Supply pump pressure very low error 1)................................................................... Failure code [CA689] (Engine Ne speed sensor error)................................................................................. Failure code [CA731] (Engine Bkup speed sensor phase error)................................................................... Failure code [CA757] (All continuous data lost error) ................................................................................... Failure code [CA778] (Engine Bkup speed sensor error) ............................................................................. Failure code [CA1228] (EGR valve servo error 1) ........................................................................................ 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 53 54 56 58 60 62 SEN05053-00 3 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 40 41 41 42 44 45 46 48 52 54 55 56 58 00-100 8 WD600-6

  7. 100 Index SEN04981-04 Table of contents Failure code [CA1625] (EGR valve servo error 2)......................................................................................... 59 Failure code [CA1626] (Bypass valve solenoid current high error) ............................................................... 60 Failure code [CA1627] (Bypass valve solenoid current low error)................................................................. 62 Failure code [CA1628] (Bypass valve servo error 1)..................................................................................... 63 Failure code [CA1629] (Bypass valve servo error 2)..................................................................................... 64 Failure code [CA1631] (Bypass valve lift sensor high error).......................................................................... 66 Failure code [CA1632] (Bypass valve lift sensor low error)........................................................................... 68 Failure code [CA1633] (KOMNET datalink timeout error) ............................................................................. 69 304 Troubleshooting by failure code (Display of code), Part 4 Failure code [CA2185] (Throttle sensor supply voltage high error)............................................................... Failure code [CA2186] (Throttle sensor power supply low error).................................................................. Failure code [CA2249] (Supply pump pressure very low error 2).................................................................. Failure code [CA2271] (EGR valve lift sensor high error) ............................................................................. Failure code [CA2272] (EGR valve lift sensor low error)............................................................................... 10 Failure code [CA2351] (EGR valve solenoid operation short circuit) ............................................................ 12 Failure code [CA2352] (EGR valve solenoid operation disconnect).............................................................. 14 Failure code [CA2555] (Intake heater relay disconnection error).................................................................. 15 Failure code [CA2556] (Intake heater relay short circuit error)...................................................................... 16 Failure code [D191KA] (AJSS neutral safety relay: Disconnection).............................................................. 18 Failure code [D191KB] (AJSS neutral safety relay: Short circuit).................................................................. 20 Failure code [D198KA] (Transmission oil pressure bypass solenoid: Disconnection)................................... 22 Failure code [D198KB] (Transmission oil pressure bypass solenoid: Short circuit) ...................................... 23 Failure code [D198KY] (Transmission oil pressure bypass solenoid: Short circuit with power supply line) .. 24 Failure code [D5ZHKA] (Terminal C signal: Disconnection).......................................................................... 26 Failure code [D5ZHKB] (Terminal C signal: Short circuit).............................................................................. 28 Failure code [D5ZHKZ] (Terminal C signal: Disconnection or short circuit)................................................... 30 Failure code [D5ZHL6] (Terminal C signal: Signal does not match engine running or stopped state) .......... 32 Failure code [DA80L4] (Auto grease controller: ON/OFF signals disagree).................................................. 34 Failure code [DAF3KK] (Machine monitor: Low source voltage (input))........................................................ 36 Failure code [DAF5KP] (5V power source output voltage defective) ............................................................ 38 Failure code [DAFRKR] (CAN communication with machine monitor: Defective communication (Abnormality in target component system))............................................................................................. 40 Failure code [DAQ0KK] (Transmission controller: Low source voltage)........................................................ 42 Failure code [DAQ0KT] (Transmission controller: Abnormality in controller) ................................................ 44 Failure code [DAQ2KK] (Transmission controller load power supply line: Low source voltage (input))........ 46 Failure code [DAQ9KQ] (Transmission controller model selection: Disagreement of model selection signals)............................................................................................... 48 Failure code [DAQRKR] (CAN communication with transmission controller: Defective communication (Abnormality in target component system))............................................................................................. 50 Failure code [DAQRMA] (Transmission controller CAN communication: Malfunction) ................................. 52 305 Troubleshooting by failure code (Display of code), Part 5 Failure code [DB2RKR] CAN communication from engine controller: Defective communication (Abnormality in target component system).............................................................................................. Failure code [DB90KK] Work equipment controller: Low source voltage (input)........................................... Failure code [DB90KT] (Work equipment controller: Abnormality in controller) ............................................ Failure code [DB92KK] Work equipment controller load power supply line: Low source voltage (input) ...... 10 Failure code [DB95KX] (Work equipment controller power supply output: Out of input signal range) .......... 12 Failure code [DB99KQ] (Work equipment controller model selection: Disagreement of model selection signals)............................................................................................... 14 Failure code [DB9RKR] CAN communication with work equipment controller: Defective communication (Abnormality in target component system)..................................................... 16 Failure code [DB9RMA] (Work equipment controller CAN communication: Malfunction) ............................. 18 Failure code [DB9RMC] (CAN communication with transmission controller: Defective operation)............... 20 Failure code [DBB0KK] (or VHMS_LED display: “n9” o “01”) VHMS controller: Low source voltage (input) ...................................................................................................................... 22 Failure code [DBB0KQ] (or VHMS_LED display: “nF” o “11”) (VHMS controller: Disagreement of model selection signals) ................................................................. 24 SEN05054-00 4 6 7 8 SEN05055-00 4 6 8 00-100 9 WD600-6

  8. 100 Index SEN04981-04 Table of contents Failure code [DBB3KK] (or VHMS_LED display: “n9” o “05”) VHMS controller battery power supply: Low source voltage (input)........................................................ Failure code [DBB5KP] (or VHMS_LED display: “n9” o “04”) (VHMS controller 5 V power supply output: Low output voltage)............................................................ Failure code [DBB6KP] (or VHMS_LED display: “n9” o “02”) (VHMS controller 24 V power supply output: Low output voltage).......................................................... Failure code [DBB7KP] (or VHMS_LED display: “n9” o “03”) (VHMS controller 12 V power supply output: Low output voltage).......................................................... Failure code [DBBQKR] (or VHMS_LED display: “n8” o “02”) VHMS controller CAN communication: Defective communication (Abnormality in target component system) .................................................... Failure code [DD15LD] (t switch (Panel switch 1): Switch is kept pressed for long time)........................... Failure code [DD16LD] (U switch (Panel switch 2): Switch is kept pressed for long time).......................... Failure code [DD17LD] (< switch (Panel switch 3): Switch is kept pressed for long time)............................ Failure code [DD18LD] (> switch (Panel switch 4): Switch is kept pressed for long time)............................ 306 Troubleshooting by failure code (Display of code), Part 6 Failure code [DDA7L4] (RPM set ON/OFF switch: ON-OFF signals disagree ............................................. Failure code [DDA8KB] (RPM set idle-up/down selector switch (idle-up): Short circuit)............................... Failure code [DDA9KB] (RPM set idle-up/down selector switch (idle-down): Short circuit).......................... Failure code [DDB6L4] (Parking brake switch (Neutralizer): ON/OFF signals disagree).............................. Failure code [DDD1LD] (Pitch operation switch: Switch is kept pressed for long time)................................ Failure code [DDDBKA] (Traction adjustment dial: Disconnection) .............................................................. Failure code [DDDBKB] (Traction adjustment dial: Short circuit).................................................................. Failure code [DDE5MA] (Emergency steering drive switch: Malfunction)..................................................... Failure code [DDK4KA] (AJSS FNR switch: Disconnection)......................................................................... Failure code [DDK4KB] (AJSS FNR switch: Short circuit)............................................................................ Failure code [DDK5L4] (AJSS shift-up/down switch: ON/OFF signals disagree) ......................................... Failure code [DDK6KA] (FNR lever switch: Disconnection).......................................................................... Failure code [DDK6KB] (FNR lever switch: Short circuit) ............................................................................. Failure code [DDP5KA] (Lock detection pressure switch of steering lock lever: Disconnection).................. Failure code [DDT0L4] (Shift mode selector switch: ON/OFF signals disagree) .......................................... Failure code [DDW9LD] (Kick-down switch: Switch is kept pressed for long time)....................................... Failure code [DDWLLD] (Hold switch: Switch is kept pressed for long time)................................................ Failure code [DF10KA] (Transmission shift lever switch: Disconnection)..................................................... Failure code [DF10KB] (Transmission shift lever switch: Short circuit)......................................................... Failure code [DGE5KX] (or VHMS_LED display: “n4” o “01”) (Atmospheric temperature sensor: Out of input signal range) ................................................................ Failure code [DGF1KA] (Transmission oil temperature sensor: Disconnection)........................................... Failure code [DGF1KB] (Transmission oil temperature sensor: Short circuit)............................................... 307 Troubleshooting by failure code (Display of code), Part 7 Failure code [DGH2KX] (Hydraulic oil temperature sensor: Out of input signal range)................................ Failure code [DGR2KA] (Rear brake oil temperature sensor: Disconnection).............................................. Failure code [DGR2KX] (Rear brake oil temperature sensor: Out of input signal range) ............................. Failure code [DGT1KA] (Torque converter oil temperature sensor: Disconnection) ..................................... Failure code [DGT1KB] (Torque converter oil temperature sensor: Short circuit)......................................... Failure code [DGT1KX] (Torque converter oil temperature sensor: Out of input signal range)..................... Failure code [DGT4KA] (or VHMS_LED display: “n3” o “12”) (Exhaust gas temperature sensor (F): Disconnection)............................................................................ Failure code [DGT4KB] (or VHMS_LED display: “n3” o “11”) (Exhaust gas temperature sensor (F): Short circuit)............................................................................... Failure code [DGT5KA] (or VHMS_LED display: “n3” o “22”) (Exhaust gas temperature sensor (R): Disconnection)........................................................................... Failure code [DGT5KB] (or VHMS_LED display: “n3” o “21”) (Exhaust gas temperature sensor (R): Short circuit)............................................................................... Failure code [DH21KA] (Work equipment pump oil pressure sensor: Disconnection).................................. Failure code [DH21KB] (Work equipment pump oil pressure sensor: Short circuit) ..................................... Failure code [DHE5KB] (or VHMS_LED display: “n3” o “32”) (Blow-by pressure sensor: Short circuit)...... Failure code [DHE5KY] (or VHMS_LED display: “n3” o “31”) (Blow-by pressure sensor: Short circuit with power supply line)............................................................. 26 28 30 32 34 36 38 40 42 SEN05056-00 4 6 8 10 14 16 18 20 22 24 26 30 32 34 36 38 40 42 44 46 48 50 SEN05057-00 4 6 8 10 11 12 14 16 18 20 22 24 26 28 00-100 10 WD600-6

  9. 100 Index SEN04981-04 Table of contents Failure code [DHT2L6] (Transmission filter clogging sensor: Signal disagrees with operating state of engine)..................................................................................... 30 Failure code [DHT8KX] (or VHMS_LED display: “n5” o “33”) (Steering oil pressure sensor: Out of input signal range) ........................................................................ 32 Failure code [DHTBKA] (Modulation clutch oil pressure sensor: Disconnection).......................................... 34 Failure code [DHTBKB] (Modulation clutch oil pressure sensor: Short circuit) ............................................. 36 Failure code [DHU2KX] (or VHMS_LED display: “n7” o “11”) (Front brake oil pressure sensor (F): Out of input signal range).............................................................. 38 Failure code [DHU3KX] (or VHMS_LED display: “n7” o “12”) (Rear brake oil pressure sensor (R): Out of input signal range).............................................................. 40 Failure code [DK30KA] (AJSS lever angle sensor: Disconnection)............................................................... 42 Failure code [DK30KY] (AJSS lever angle sensor: Short circuit with power supply line).............................. 44 308 Troubleshooting by failure code (Display of code), Part 8 Failure code [DK59KA] (Lift EPC lever potentiometer (Main): Disconnection).............................................. Failure code [DK59KY] (Lift EPC lever potentiometer (Main): Short circuit with power supply line) ............. Failure code [DK59L8] (Lift EPC lever potentiometer (Main): Analog signals disagree)............................... 10 Failure code [DK5AKA] (Lift EPC lever potentiometer (Sub): Disconnection)............................................... 13 Failure code [DK5AKY] (Lift EPC lever potentiometer (Sub): Short circuit with power supply line) .............. 16 Failure code [DK5BKA] (Tilt & pitch EPC lever potentiometer (Main): Disconnection).................................. 19 Failure code [DK5BKY] (Tilt & pitch EPC lever potentiometer (Main): Short circuit with power supply line). 22 Failure code [DK5BL8] (Tilt & pitch EPC lever potentiometer (Main): Analog signals disagree)................... 24 Failure code [DK5CKA] (Tilt & pitch EPC lever potentiometer (Sub): Disconnection)................................... 27 Failure code [DK5CKY] (Tilt & pitch EPC lever potentiometer (Sub): Short circuit with power supply line).. 30 Failure code [DKD0KA] (Frame angle sensor: Disconnection) ..................................................................... 32 Failure code [DKD0KY] (Frame angle sensor: Short circuit with power supply line)..................................... 34 Failure code [DKD0KZ] (AJSS lever and frame angle sensor: Disconnection or short circuit) ..................... 36 Failure code [DLFAKA] (Modulation clutch output shaft speed sensor: Disconnection)................................ 38 Failure code [DLFALC] (Modulation clutch output shaft speed sensor: Speed signals disagree) ................. 40 Failure code [DLT3KA] (Transmission output shaft speed sensor (2): Disconnection) ................................. 42 Failure code [DLT3LC] (Transmission output shaft speed sensor (2): Speed signals disagree)................... 44 Failure code [DLT4KB] (Transmission output shaft speed sensor (1): Short circuit)..................................... 46 Failure code [DLT4KX] (Transmission output shaft speed sensor (1): Out of input signal range)................. 48 Failure code [DV00KB] (Alarm buzzer: Short circuit) .................................................................................... 50 Failure code [DW4PKA] (Blade raise EPC solenoid: Disconnection)............................................................ 52 Failure code [DW4PKB] (Blade raise EPC solenoid: Short circuit) ............................................................... 53 Failure code [DW4PKY] (Blade raise EPC solenoid: Short circuit with power supply line) ........................... 54 Failure code [DW4QKA] (Blade lower EPC solenoid: Disconnection)........................................................... 56 Failure code [DW4QKB] (Blade lower EPC solenoid: Short circuit).............................................................. 57 Failure code [DW4QKY] (Blade lower EPC solenoid: Short circuit with power supply line).......................... 58 Failure code [DW4RKA] (Tilt & pitch EPC solenoid: Disconnection)............................................................. 60 Failure code [DW4RKB] (Tilt & pitch EPC solenoid: Short circuit)................................................................. 61 Failure code [DW4RKY] (Tilt & pitch EPC solenoid: Short circuit with power supply line) ............................ 62 Failure code [DW4SKA] (Tilt & pitch EPC solenoid: Disconnection)............................................................. 64 Failure code [DW4SKB] (Tilt & pitch EPC solenoid: Short circuit)................................................................. 65 Failure code [DW4SKY] (Tilt & pitch EPC solenoid: Short circuit with power supply line)............................. 66 Failure code [DW7BKA] (Fan reverse solenoid: Disconnection)................................................................... 68 Failure code [DW7BKB] (Fan reverse solenoid: Short circuit)....................................................................... 70 Failure code [DW7BKY] (Fan reverse solenoid: Short circuit with power supply line) .................................. 72 309 Troubleshooting by failure code (Display of code), Part 9 Failure code [DWM1KA] (Work equipment neutral lock solenoid: Disconnection)........................................ Failure code [DWM1KB] (Work equipment neutral lock solenoid: Short circuit)............................................ Failure code [DWM1KY] (Work equipment neutral lock solenoid: Short circuit with power supply line)........ Failure code [DWN7KA] (Blade float magnet detent solenoid: Disconnection)............................................. 10 Failure code [DWN7KB] (Blade float magnet detent solenoid: Short circuit)................................................. 12 Failure code [DWN7KY] (Blade float magnet detent solenoid: Short circuit with power supply line) ............ 14 Failure code [DWNFKA] (Modulation clutch cut-off release solenoid: Disconnection).................................. 16 Failure code [DWNFKB] (Modulation clutch cut-off release solenoid: Short circuit)...................................... 18 Failure code [DWNFKY] (Modulation clutch cut-off release solenoid: Short circuit with power source line).. 20 SEN05058-00 3 6 SEN05059-00 4 6 8 00-100 11 WD600-6

  10. 100 Index SEN04981-04 Table of contents Failure code [DX16KA] (Fan pump EPC solenoid: Disconnection)............................................................... Failure code [DX16KB] (Fan pump EPC solenoid: Short circuit).................................................................. Failure code [DX16KY] (Fan pump EPC solenoid: Short circuit with power supply line).............................. Failure code [DXA1KA] (Pump PC-EPC solenoid: Disconnection)............................................................... Failure code [DXA1KB] (Pump PC-EPC solenoid: Short circuit) .................................................................. Failure code [DXF0KA] (AJSS EPC solenoid: Disconnection)...................................................................... Failure code [DXF0KB] (AJSS EPC solenoid: Short circuit)......................................................................... Failure code [DXH1KA] (Lockup ECMV solenoid: Disconnection)................................................................ Failure code [DXH1KB] (Lockup ECMV solenoid: Short circuit)................................................................... Failure code [DXH1KY] (Lockup ECMV solenoid: Short circuit with power supply line)............................... Failure code [DXH4KA] (1st clutch ECMV solenoid: Disconnection)............................................................ Failure code [DXH4KB] (1st clutch ECMV solenoid: Short circuit)................................................................ Failure code [DXH4KY] (1st clutch ECMV solenoid: Short circuit with power supply line) ........................... 310 Troubleshooting by failure code (Display of code), Part 10 Failure code [DXH5KA] (2nd clutch ECMV solenoid: Disconnection)........................................................... Failure code [DXH5KB] (2nd clutch ECMV solenoid: Short circuit) .............................................................. Failure code [DXH5KY] (2nd clutch ECMV solenoid: Short circuit with power supply line).......................... Failure code [DXH6KA] (3rd clutch ECMV solenoid: Disconnection)............................................................ Failure code [DXH6KB] (3rd clutch ECMV solenoid: Short circuit)............................................................... Failure code [DXH6KY] (3rd clutch ECMV solenoid: Short circuit with power supply line)........................... Failure code [DXH7KA] (R clutch ECMV solenoid: Disconnection).............................................................. Failure code [DXH7KB] (R clutch ECMV solenoid: Short circuit).................................................................. Failure code [DXH7KY] (R clutch ECMV solenoid: Short circuit with power supply line).............................. Failure code [DXH8KA] (F clutch ECMV solenoid: Disconnection)............................................................... Failure code [DXH8KB] (F clutch ECMV solenoid: Short circuit).................................................................. Failure code [DXH8KY] (F clutch ECMV solenoid: Short circuit with power supply line).............................. Failure code [DXHHKA] (4th clutch ECMV solenoid: Disconnection)........................................................... Failure code [DXHHKB] (4th clutch ECMV solenoid: Short circuit)............................................................... Failure code [DXHHKY] (4th clutch ECMV solenoid: Short circuit with power supply line)........................... Failure code [DXHJKA] (RH pitch REAR EPC solenoid: Disconnection)...................................................... Failure code [DXHJKB] (RH pitch REAR EPC solenoid: Short circuit)......................................................... Failure code [DXHJKY] (RH pitch REAR EPC solenoid: Short circuit with power supply line)..................... Failure code [DXHKKA] (RH pitch FORWARD EPC solenoid: Disconnection)............................................. Failure code [DXHKKB] (RH pitch FORWARD EPC solenoid: Short circuit) ................................................ Failure code [DXHKKY] (RH pitch FORWARD EPC solenoid: Short circuit with power supply line)............ Failure code [DXHPKA] (Modulation clutch solenoid: Disconnection).......................................................... Failure code [DXHPKB] (Modulation clutch solenoid: Short circuit).............................................................. Failure code [DXHPKY] (Modulation clutch solenoid: Short circuit with power source line)......................... Failure code [DXHPMA] (Modulation clutch solenoid: Malfunction).............................................................. Failure code [F@BBZL] (or VHMS_LED display: “n3” o “38”) (Blow-by pressure: High error).................... Failure code [F@BYNR] (or VHMS_LED display: “n3” o “62”) (Exhaust gas temperature (F): Abnormal heat)....................................................................................... Failure code [F@BYNS] (or VHMS_LED display: “n3” o “61”) (Exhaust gas temperature (F): Overheat) .. Failure code [F@BZNR] (or VHMS_LED display: “n3” o “72”) (Exhaust gas temperature (R): abnormal heat)....................................................................................... Failure code [F@BZNS] (or VHMS_LED display “n3” o “71”) (Exhaust gas temperature (R): Overheat) ... 400 Troubleshooting of electrical system (E-mode) Before carrying out troubleshooting of electrical system............................................................................... Information in troubleshooting table.............................................................................................................. E-1 Engine does not start.............................................................................................................................. E-2 Wiper does not operate.......................................................................................................................... E-3 Windshield washer does not operate ..................................................................................................... E-4 Headlamp, clearance lamp, tail lamp, and license lamp do not light up or go off................................... E-5 Working lamp does not light up or go off................................................................................................ E-6 Step lamp does not light up or go off...................................................................................................... E-7 Turn signal lamp and hazard lamp do not light up or go off.................................................................... E-8 Brake lamp does not light or it keeps lighting up.................................................................................... E-9 Backup lamp does not light or it keeps lighting up. ................................................................................ 22 23 24 25 26 27 28 29 30 32 34 36 38 SEN05060-00 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 35 36 37 38 39 40 42 44 46 48 50 52 54 56 SEN05061-00 2 5 6 16 24 30 46 54 56 66 70 00-100 12 WD600-6

  11. 100 Index SEN04981-04 Table of contents E-10 Backup buzzer does not sound or it keeps sounding. .......................................................................... 74 E-11 Horn does not sound or it keeps sounding............................................................................................ 78 E-12 Alarm buzzer does not sound or it keeps sounding.............................................................................. 82 E-13 Air conditioner does not operate or stop............................................................................................... 84 E-14 Electric priming pump does not operate or does not stop automatically............................................... 86 500 Troubleshooting of hydraulic and mechanical system (H-mode) Method of using troubleshooting chart .......................................................................................................... Table of failure modes and causes................................................................................................................ H-1 Machine does not start ........................................................................................................................... 10 H-2 Torque converter lockup is not switched (engine stalls) ......................................................................... 12 H-3 Torque converter lockup is not turned on................................................................................................ 13 H-4 Travel speed is slow, thrusting force is weak, uphill traveling power is weak, and gear is not shifted.... 14 H-5 Shocks are large at the times of starting and shifting gear..................................................................... 16 H-6 Time lag is large at the times of starting and shifting gear...................................................................... 18 H-7 Torque converter oil temperature is high ................................................................................................ 20 H-8 Steering does not turn [machine with steering wheel] ............................................................................ 21 H-9 Steering does not turn [machine with AJSS]........................................................................................... 22 H-10 Turning, response of steering is poor [machine with steering wheel]................................................... 23 H-11 Turning, response of AJSS is poor [machine with AJSS] ..................................................................... 24 H-12 Steering is heavy [machine with steering wheel].................................................................................. 25 H-13 When machine turns, it shakes or makes large shocks [machine with steering wheel] ....................... 26 H-14 When machine turns, it shakes or makes large shocks [machine with AJSS]...................................... 27 H-15 Wheel brake does not work or does not work well ............................................................................... 28 H-16 Wheel brake is not released or it drags................................................................................................ 29 H-17 Parking brake does not work or does not work well ............................................................................. 30 H-18 Parking brake is not released or it drags (including emergency release system)................................. 31 H-19 Blade does not rise............................................................................................................................... 32 H-20 Blade speed is low or rising force of lift is insufficient........................................................................... 33 H-21 When rising, blade comes to move slowly at specific height................................................................ 34 H-22 Lift cylinder cannot hold down blade (Blade floats)............................................................................... 34 H-23 Hydraulic drifts of blade occur often...................................................................................................... 34 H-24 Blade wobbles during operation ........................................................................................................... 34 H-25 Blade does not tilt and pitch.................................................................................................................. 35 H-26 Blade speed is low or tilt and pitch force is insufficient......................................................................... 36 H-27 Bucket comes to operate slowly in the midst of tilt and pitch................................................................ 37 H-28 Tilt & pitch cylinder cannot hold down blade......................................................................................... 37 H-29 Hydraulic drifts of blade occur often...................................................................................................... 37 H-30 Blade wobbles during travel when loaded (Work equipment valve is set to “HOLD”)........................... 37 H-31 During operation of machine, engine speed lowers remarkably or engine stalls.................................. 38 H-32 Large shocks are made when work equipment starts and stops.......................................................... 38 H-33 When work equipment circuit is relieved singly, other work equipment moves .................................... 38 H-34 Fan speed is abnormal (Fan sound and vibration are abnormally large or engine overheats)............. 39 600 Troubleshooting of engine (S-mode) Method of using troubleshooting chart .......................................................................................................... S-1 Engine does not start easily.................................................................................................................... S-2 Engine does not start.............................................................................................................................. S-3 Engine does not pick up smoothly.......................................................................................................... 12 S-4 Engine stops during operation ................................................................................................................ 13 S-5 Engine does not rotate smoothly (Hunting occurs)................................................................................. 14 S-6 Engine lacks output (or lacks power)...................................................................................................... 15 S-7 Exhaust smoke is black (Incomplete combustion).................................................................................. 16 S-8 Oil is consumed much (or exhaust gas color is blue) ............................................................................. 18 S-9 Engine oil becomes contaminated quickly.............................................................................................. 19 S-10 Fuel consumption is excessive............................................................................................................. 20 S-11 Coolant contains oil (blows back or reduces)........................................................................................ 21 S-12 Oil pressure drops................................................................................................................................. 22 S-13 Oil level rises (Water, fuel in oil)............................................................................................................ 24 S-14 Coolant temperature rises too high (Overheating)................................................................................ 26 SEN05062-00 4 6 SEN05063-00 2 6 8 00-100 13 WD600-6

  12. 100 Index SEN04981-04 Table of contents S-15 Abnormal noise is made....................................................................................................................... S-16 Vibration is excessive........................................................................................................................... S-17 Air cannot be bled from fuel circuit....................................................................................................... 27 28 30 50 Disassembly and assembly 100 General information on disassembly and assembly How to read this manual ............................................................................................................................... Coating materials list..................................................................................................................................... Special tools list............................................................................................................................................. Sketches of special tools............................................................................................................................... 201 Engine and cooling system, Part 1 Removal and installation of engine assembly............................................................................................... Removal and installation of radiator assembly.............................................................................................. Removal and installation of air aftercooler.................................................................................................... Removal and installation of cooling fan and fan motor assembly ................................................................. Removal and installation of damper assembly.............................................................................................. Disassembly and assembly of damper assembly......................................................................................... Removal and installation of fuel tank assembly ............................................................................................ Removal and installation of engine hood assembly...................................................................................... Removal and installation of bulkhead assembly ........................................................................................... 202 Engine and cooling system, Part 2 Removal and installation of fuel supply pump assembly............................................................................... Removal and installation of cylinder head assembly .................................................................................... Removal and installation of fuel injector assembly ....................................................................................... Removal and installation of engine front seal ............................................................................................... Removal and installation of engine rear seal ................................................................................................ 301 Power train, Part 1 Removal and installation of parking brake assembly.................................................................................... Removal and installation of torque converter and transmission assembly ................................................... 302 Power train, Part 2 Disassembly and assembly of torque converter assembly........................................................................... Disassembly and assembly of transmission assembly ................................................................................. Disassembly and assembly of transfer assembly......................................................................................... Disassembly and assembly of parking brake assembly................................................................................ 303 Power train, Part 3 Removal and installation of front axle assembly........................................................................................... Removal and installation of rear axle assembly............................................................................................ Removal and installation of center support assembly................................................................................... Disassembly and assembly of center support assembly .............................................................................. Disassembly and assembly of differential assembly..................................................................................... 304 Power train, Part 4 Removal and installation of final drive carrier assembly ............................................................................... Disassembly and assembly of final drive carrier assembly........................................................................... Removal and installation of front final drive brake assembly ........................................................................ Disassembly and assembly of final drive assembly...................................................................................... 400 Brake system Disassembly and assembly of brake assembly ............................................................................................ Removal and installation of brake valve assembly ....................................................................................... Disassembly and assembly of accumulator and charge valve assembly ..................................................... Disassembly and assembly of slack adjustor assembly ............................................................................... 500 Undercarriage and frame Removal and installation of center hinge pin ................................................................................................ Removal and installation of counterweight assembly ................................................................................... 600 Hydraulic system Removal and installation of hydraulic tank assembly.................................................................................... Removal and installation of hydraulic pump assembly ................................................................................. SEN05141-00 2 4 7 11 SEN05142-00 2 6 11 12 14 16 20 22 24 SEN05143-01 2 8 24 28 31 SEN05144-00 2 4 SEN05145-00 2 29 56 71 SEN05146-00 2 4 6 8 12 SEN05147-00 2 4 5 7 SEN05148-00 2 10 11 14 SEN05149-00 2 9 SEN05150-00 2 4 00-100 14 WD600-6

  13. 100 Index SEN04981-04 Table of contents Removal and installation of control valve assembly...................................................................................... Disassembly and assembly of control valve assembly.................................................................................. 10 Removal and installation of steering valve assembly.................................................................................... 15 Disassembly and assembly of hydraulic cylinder assembly.......................................................................... 16 700 Work equipment Removal and installation of work equipment assembly................................................................................. 800 Cab and its attachments Removal and installation of operator's cab assembly.................................................................................... Removal and installation of operator's cab glass (stuck glass)..................................................................... Removal and installation of floor frame assembly......................................................................................... 14 Disassembly and assembly of operator’s seat assembly.............................................................................. 17 Removal and installation of air conditioner unit assembly............................................................................. 50 900 Electrical system Removal and installation of engine controller assembly................................................................................ Removal and installation of transmission controller assembly ...................................................................... Removal and installation of loader controller assembly ................................................................................ Removal and installation of VHMS controller assembly................................................................................ Removal and installation of machine monitor assembly................................................................................ 8 SEN05151-00 2 SEN05152-00 2 6 SEN05153-00 2 4 4 5 6 90 Diagrams and drawings 100 Hydraulic diagrams and drawings Power train hydraulic circuit diagram............................................................................................................. Brake hydraulic circuit diagram ..................................................................................................................... 200 Electrical diagrams and drawings Air conditioner electrical circuit diagram........................................................................................................ Electrical circuit diagram (1/10)..................................................................................................................... Electrical circuit diagram (2/10)..................................................................................................................... Electrical circuit diagram (3/10)..................................................................................................................... Electrical circuit diagram (4/10)..................................................................................................................... Electrical circuit diagram (5/10)..................................................................................................................... 13 Electrical circuit diagram (6/10)..................................................................................................................... 15 Electrical circuit diagram (7/10)..................................................................................................................... 17 Electrical circuit diagram (8/10)..................................................................................................................... 19 Electrical circuit diagram (9/10)..................................................................................................................... 21 Electrical circuit diagram (10/10)................................................................................................................... 23 Connector list and stereogram ...................................................................................................................... 25 SEN05004-00 2 3 SEN05005-02 3 5 7 9 11 00-100 15 WD600-6

  14. SEN04981-04 WD600-6 Wheel dozer Form No. SEN04981-04 ©2011 KOMATSU All Rights Reserved Printed in Japan 08-11 00-100 16

  15. 201 Engine and cooling system, Part 1 Removal and installation of engine assembly SEN05142-00 Removal and installation of engine assembly Removal k Stop the machine on level ground and set the frame lock bar. k Lower the work equipment to the ground completely and stop the engine. Apply the parking brake and put the blocks under the wheels. k Disconnect the negative terminal (–) of the battery before starting with the work. 3. 4. Remove air hose (2). Remove komaclone hose and tube assembly (3). Disconnect dust indicator hoses (4). Remove air cleaner (5). Disconnect connector E15 (6). Disconnect wiring harness (7). Remove air cleaner bracket (8). [*1] 1 [*2] 5. 6. 7. 8. 9. [*3] 1. Remove the radiator assembly, referring to “Removal and installation of radiator assembly”. Overall view of machine right side q 2. Open the bulkhead cover to remove cover (1) of the air cleaner. 10. Remove bracket and heat insulation cover (9) assembly. 50-201 2 WD600-6

  16. 201 Engine and cooling system, Part 1 Removal and installation of engine assembly SEN05142-00 11. Disconnect drive shaft (10). a Remove the bottom mounting bolt as shown below. 1) Pull pin (11) out of a location near the engine mount, which is situated in the front right side, and then push in forcing screw (B). 2) Turn forcing screw (B) for deburring and then remove the bottom mounting bolt of the drive shaft. [*4] 16. Disconnect fuel supply hose (16). 17. Disconnect connector EP1 (17) and EP2 (18). 18. Disconnect clamps (19) and (20). 19. Disconnect 2 fuel hoses (21). 12. Remove cover (12). 13. Disconnect connector E16 (13). 14. Loosen the adjustment bolt of air conditioner compressor (14) and then remove air condi- tioner compressor belt (15). 15. Remove air conditioner compressor (14). a Don't disconnect the air conditioner hose. [*5] Left side q 20. Disconnect torque converter cooler (TC) cool- ant tubes (22) and (23). a Connection: O-ring 21. Disconnect coolant tube (24). a Replacement of gasket (G) 22. Disconnect heater hose (25). 50-201 3 WD600-6

  17. 201 Engine and cooling system, Part 1 Removal and installation of engine assembly SEN05142-00 a 23. Disconnect starting motor terminal (26). 24. Disconnect connector ER1 (27). 25. Disconnect connector ER2 (28). 26. Disconnect connector ER3 (29). 27. Disconnect wiring harnesses (30). 28. Disconnect grounding wire ER06 (31). 29. Disconnect engine grounding wire (32). 30. Remove engine mount bolts (33) and (34). [*6] Front right side and left side lifting hooks are provided in the bottom. 31. Lift and remove engine assembly (35), using T- shaped lifting tool [1]. a Confirm that the wirings and hoses are disconnected properly, and sling the engine assembly slowly. 4 Engine assembly: 3,200 kg a F: Rear side lifting hook 50-201 4 WD600-6

  18. 201 Engine and cooling system, Part 1 Removal and installation of engine assembly SEN05142-00 Installation q Carry out installation in the reverse order to removal. [*1] 3 Air hose clamp: 10.5 ± 0.5 Nm {1.07 ± 0.05 kgm} [*2] 3 Komaclone tube assembly hose clamp: 5.9 ± 0.49 Nm {0.6 ± 0.05 kgm} [*3] 3 Air cleaner band: 12.8 – 17.7 Nm {1.3 – 1.8 kgm} [*4] 3 Drive shaft assembly mounting bolt: 107 – 127 Nm {10.9 – 13.0 kgm} [*5] a Adjust the air conditioner compressor belt ten- sion, referring to “Adjusting air conditioner compressor belt tension” in Testing and adjust- ing. [*6] 3 Engine mount bolt: 824 – 1030 Nm (84 – 105 kgm) Target: 927 Nm (94.5 kgm) Refilling with coolant Add coolant through the coolant filler to the specified level. Run the engine to increase coolant temperature and then confirm the cool- ant level again. 5 Coolant: 160 l l q 50-201 5 WD600-6

  19. 201 Engine and cooling system, Part 1 Removal and installation of radiator assembly SEN05142-00 Removal and installation of radiator assembly Removal k Park the machine on flat ground and set the safety bar to the frame. k Lower the work equipment to the ground completely and stop the engine. Apply the parking brake and put the blocks under the wheels. k Loosen the filler cap of the hydraulic tank gradually to release the residual pressure from the hydraulic tank. 7. Disconnect connector G05 (5) and disconnect the clip of the wiring harness. 1 1. Remove cover (1). 8. 9. 10. Remove reservoir tank (9). Disconnect right and left chains (6). Disconnect hoses (7) and (8). 2. Drain the engine coolant. 6 Coolant: 160 l l 3. Remove the engine hood and covers, referring to “Removal and installation of engine hood assembly”. 11. Disconnect hoses (10). 12. Remove covers (11) and (12). a Take care in this operation not to damage the aftercooler core. 4. 5. 6. Remove cover (2). Disconnect cover (3). Disconnect 2 hoses (4) from the reservoir tank. 50-201 6 WD600-6

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  21. 201 Engine and cooling system, Part 1 Removal and installation of radiator assembly SEN05142-00 13. Remove right and left side bars (13). 14. Remove cover and frame assembly (14). a Take care in this operation not to damage the aftercooler core. 17. Disconnect fan drain hose (19), fan inlet hose (20) and fan outlet hose (21). 18. Remove clamp (22). 19. Disconnect connectors G06 (23) and GR1 (24) situated in the rear left side of the radiator. 20. Disconnect clamp (30). a BB: Back buzzer 15. Disconnect air conditioner hose clamps (15) from radiator guard (16). 16. Open radiator grille (17) and remove 3 fan guards (18). 21. Remove 3 mounting bolts of left side and then open fan motor and support assembly (25).[*1] 50-201 7 WD600-6

  22. 201 Engine and cooling system, Part 1 Removal and installation of radiator assembly SEN05142-00 22. Fix fan motor and support assembly (25) in the manner shown below. 1) Remove pin (51) from the hinged portion of fan motor and support assembly (25). 2) Remove lock pin (52) and then fix the assembly to the bracket (BKT) using lock pin (52). 25. Lift and float the radiator guard and fan assem- bly (28). a (B): The mounting bolt position in the rear side of the radiator. 4 Radiator guard and fan assembly: 650 kg 26. Disconnect sponge (29). 23. Remove right and left mounting bolts (26). a Leave a counter mark (M) to the position. 24. Remove the cover of section (A) and remove right and left mounting bolts (27). a The mounting bolt is provided in the rear side of the radiator, too. 50-201 8 WD600-6

  23. 201 Engine and cooling system, Part 1 Removal and installation of radiator assembly SEN05142-00 27. Lift radiator guard and fan assembly (28) slowly. 28. Take out radiator guard and fan assembly (28) while avoiding contact against tube (C) of the aftercooler. 34. Disconnect connectors (36) from the radiator outlet. a Replacement of gasket (G) a When disconnecting the outlet at the con- nection with radiator hose (38) (it takes more than an hour) 1) Loosen right and left side clamps (37) and then push radiator hose (38) all the way in the radiator. a Hose (38) is disconnected later (as the radiator assembly is lifted up). [*5] 35. Disconnect air conditioner condenser assem- bly (40) directing bracket (39) outward. a Remove the air conditioner hose clamp prior to the above operation. 36. Lift radiator assembly (41) temporarily and remove right and left side mounting bolts (42). [*6] 37. Disconnect hose (38) (noted in the foregoing) while the radiator assembly being lifted up. 29. Disconnect aeration hose (30). 30. Loosen radiator hose clamps (31) and (32). [*2] 31. Loosen air hose clamp (33). 32. Disconnect air tube (34). 33. Remove air hose (35). [*3] [*4] 50-201 9 WD600-6

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