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Stihl MS 440/044 Chainsaw. SECTION: Tools and Equipment ISSUED: 02-2011 REVISED: ##-####. Objectives. To provide an understanding of the following Specifications Use Maintenance Safety. STIHL MS 440/044 20” Bar Chain 33 cutting teeth Carbide tipped HD air filter with pre-filter.

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Stihl MS 440/044 Chainsaw

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Stihl MS 440/044 Chainsaw

SECTION: Tools and Equipment

ISSUED: 02-2011 REVISED: ##-####

  • To provide an understanding of the following
    • Specifications
    • Use
    • Maintenance
    • Safety
STIHL MS 440/044

20” Bar


33 cutting teeth

Carbide tipped

HD air filter with pre-filter

2 stroke engine

5.2 horse power

50:1 pre mix

Spark plug

Bosch WSR6 F or NGK BPMR 7A

Idle RPM-2,500

Max RPM-13,500

  • Vertical ventilation
  • Forcible entry
  • Cutting timber and brush
  • Cutting lumber
    • Shoring operations
control lever positions
Control Lever Positions
  • Stop
  • Run
  • Half choke
  • Choke

Interlock and throttle must be depressed

to switch from run to half choke or choke

  • Chain brake
    • Manual and inertia operated
  • Decompression valve
    • Allows for an easier and quicker start
  • Chain catch
    • Reduces risk of operator contact with chain should it break or derail
  • Chain tensioner
    • Allows for chain tension adjustment
starting procedures
Starting Procedures
  • Ground starting method
    • Place saw on ground
    • Disengage chain break
    • Ensure control lever is in choke position
    • Hold handle firmly with left hand
starting procedures1
Starting Procedures
  • Place foot firmly in handle
  • Pull starter grip
  • Repeat until engine fires
  • Adjust control lever to half choke
  • Pull starter grip until saw starts and runs
starting procedures2
Starting Procedures
  • Quickly depress interlock and throttle
    • Places saw in run position
  • Do not pull start rope to its full extension
starting procedures3
Starting Procedures
  • Drop starting method
    • Ensure brake is disengaged
    • Ensure control lever is in choke
    • Hold handle with left hand
    • Hold starter grip with right hand
starting procedures4
Starting Procedures
  • Raise saw slightly above waist
  • Let saw drop in a controlled manner
    • Pulling starter grip
  • Repeat until saw fires
  • Adjust master control valve to half choke
starting procedures5
Starting Procedures
  • Continue to drop and pull starter grip until saw fires and runs
  • Quickly squeeze throttle and interlock
    • Puts saw in run position
  • Do not pull start rope to its full extension
  • Disengage brake
    • Rest tip of the saw’s bar on ground or roof
    • With left hand, keep thumb on handle
    • Pull back on the chain brake to disengage
  • Stopping the Chain
    • Release throttle to bring saw to idle
    • Engage chain brake with back of left hand while holding handle
  • Turn saw off by raising control lever to the stop (top) position
  • Always place saw in ready to run position when placing back into service
    • Brake disengaged, throttle trigger interlock depressed and the control lever in the choke position
maintenance basic
  • Refuel after use
  • Refill chain bar oil whenever you refuel
  • Adjust chain tension ensuring the chain can slide across the bar
    • Approximately 1/16” gap between bar and chain
  • Rotate guide bar when chain is removed to extend bar life
  • Inspect chain for damage
    • Replace when 3 consecutive teeth or 6 total teeth are missing or when a tie strap is broken
  • Saw may need a complete tear down to ensure it is thoroughly cleaned of all dirt and debris
    • Pay extra attention to the cooling fins. Over time they can accumulate “gunk” and cause the saw to overheat.
maintenance advanced
  • Recommended tools
    • Scrench
      • Stihl combination wrench
    • Stihl flathead screwdriver
    • Larger flathead screwdriver
    • Stihl provided torques style wrench
    • Cleaning solvent or WD-40
air filter system
Air Filter System
  • Set master control lever to full choke
  • Open the twist lock above and remove the carburetor box cover
air filter system1
Air Filter System
  • Remove filters and check outer butterfly position
    • Ensure its closed
  • Separate filter components
  • Clean filters by using compressed air
    • Blowing from the inside out
  • In case of stubborn dirt, wash filters with warm soapy water
    • Rinse from the inside out
  • Let air dry

Outer Butterfly

Felt Prefilter

HD Filter

Standard Filter

clutch and chain assembly
Clutch and Chain Assembly
  • Unscrew the nuts and remove chain sprocket cover
    • Note side of stamped serial numbers or graphics on chain bar
  • Bar must be flipped when re-installed

Stamped Serial #

chain and bar removal
Chain and Bar Removal
  • Loosen chain by turning tensioning screw counterclockwise
  • Once chain starts to sag on the bottom of the bar, remove the bar and chain

Chain Tensioning Screw

chain and bar cleaning
Chain and Bar Cleaning
  • Use parts cleaner to thoroughly clean chain and bar
  • Inspect chain and determine if it needs to be out of service.
    • 3 missing teeth in a row
    • 6 missing teeth total
    • 1 broken link
  • Use a small screwdriver to remove debris from the bar chain guide
  • Use compressed air to blow excess solvent from the chain and bar and dry with a rag
powerhead cleaning
Powerhead Cleaning
  • Remove the inner side mounting plate by removing the screw adjacent to the tensioning screw
  • Remove the chain catcher with the Stihl torx wrench
powerhead cleaning1
Powerhead Cleaning
  • Removing the E clip from the crank shaft using small screwdriver
  • Remove clutch drum assembly
  • Place the needle cage in a cap full of bar oil to lube

Clutch Drum

Rim Sprocket

Needle Cage



powerhead cleaning2
Powerhead Cleaning
  • Use compressed air to blow as much debris off of the powerhead
  • Remove the two cover plates using the Stihl torx wrench
  • Use the parts cleaner to further clean the powerhead
    • Use caution with the solvent avoiding the carburetor intake
  • Clean thoroughly
  • Use compressed air to blow off any excess solvent and dry with a rag
powerhead cleaning3
Powerhead Cleaning
  • Clean all parts using the parts cleaner
  • Use compressed air to blow off excess solvent and dry with a rag
  • Set aside once cleaned and try to keep everything organized
chainsaw reassembly
Chainsaw Reassembly
  • Now reassemble the powerhead in reverse order
  • Starting with the following
    • 2 cover plates
    • Clutch drum assembly
      • When installing the clutch drum, rotate and apply slight pressure until the oil pump drive spring engages the slot on the outside diameter of the drum
      • There should be a noticeable connection when the drum catches and drops into place
      • The slot on the drum is identified with a mark located on the face of the drum
chainsaw reassembly1
Chainsaw Reassembly
  • Continue reassembling in the following order
    • Chain catcher
    • Inner side plate
    • Bar and chain
    • Sprocket cover
    • Air filter
    • Carburetor box cover
chainsaw reassembly2
Chainsaw Reassembly
  • Replace bar and chain
  • Ensure the bar is flipped to the opposite side from where it was initially assembled
    • This will help with wear over time
  • Ensure the chain is properly seated in the bar and sprocket
chainsaw reassembly3
Chainsaw Reassembly
  • Apply tension to the chain by turning the chain tension screw clockwise
    • Take some of the sag out of the chain
  • Install the sprocket cover and finger tighten the two nuts
chainsaw reassembly4
Chainsaw Reassembly
  • Adjust the tension of the chain
  • Appropriate tension has been applied when:
    • With a gloved hand, pull the chain upward from the middle of the bar to create a gap equal to the width of a nickels edge being exposed between the chain and bar
    • With the chain brake off, the chain can be spun around the bar
  • Use the Scrench to finish tightening the sprocket cover nuts until snug
    • Do not over tighten
chainsaw reassembly5
Chainsaw Reassembly
  • Refuel with 2 stroke pre-mix 50:1 fuel
  • Top off bar oil
  • Test Run
    • Ensure adequate chain lubrication by running at full throttle and aiming saw towards the ground
    • A light spray pattern of oil should begin to form on the ground
      • Adjust if necessary
  • Re-adjust chain tension if necessary
  • Place back into service in the “Ready Run Position”
chainsaw maintenance
Chainsaw Maintenance
  • Refer to Stihl Owner’s Manual for further maintenance needs
  • Always wear proper PPE when operating chainsaws.
    • Minimum- helmet, eye protection, gloves, and hearing protection while performing maintenance
  • Avoid cutting overhead and inline with body
  • Maintain a firm grip at all times
  • Cut at full throttle
  • Common reactive forces when cutting
    • Kickback
      • Occurs when saw chain near upper quadrant of bar nose contacts a solid object causing the saw to fling up and back in an uncontrolled arc
    • Pushback
      • Occurs when the chain on the top of the bar is suddenly stopped or caught, driving the saw straight back into the operator
    • Pull in
      • Occurs when the chain on the bottom of the bar is suddenly stopped or caught, causing the saw to be pulled forward
  • Let the saw cool before refueling