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Hydraulic Pumps. Operation and Inspection. Gear Pumps. Designed using 2 gears Fluid is forced around the outside of the gears Positive displacement type Most inefficient Rugged design. Gear Pump Identification. Has 2 shafts, 1 exposed and the other hidden

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hydraulic pumps

Hydraulic Pumps

Operation and Inspection

gear pumps
Gear Pumps
  • Designed using 2 gears
  • Fluid is forced around the outside of the gears
  • Positive displacement type
  • Most inefficient
  • Rugged design
gear pump identification
Gear Pump Identification
  • Has 2 shafts, 1 exposed and the other hidden
  • Drive shaft off center of the housing
gear pump inspection
Gear Pump Inspection
  • Measure distance between end plates (wear plates) and gears
  • Measure distance between gears and housing
  • Measure distance between gear teeth (backlash)
  • Visual inspection of gears
vane pump
Vane Pump
  • Uses a rotor with several sliding vanes inside to pressurize the fluid
  • Rides on a cam ring
  • Rotation can be reversed by flipping the cam ring over
  • Inlet and outlet in the rear housing
vane pump identification
Vane Pump Identification
  • Is usually square housing
  • Shaft is in the center of the housing
vane pump inspection
Vane Pump Inspection
  • Distance between rotor and end plate
  • Distance between rotor and front plate
  • Clearance of vanes in rotor
  • Wear patterns on cam ring
piston pumps
Piston Pumps
  • Uses a round cylinder housing with cylinders in it to pressurize the fluid
  • Each cylinder has a piston
  • Each piston is connected to a swash plate
piston pump operation1
Piston Pump Operation
  • Most piston pumps have a swash plate that can be moved, which varies the amount of fluid pumped each revolution
piston pump identification
Piston Pump Identification
  • May be round or square
  • Can be determined by identification tag
  • Most piston pumps require 2 filters
  • Usually have a small line (case drain) attached to the outside of the pump
piston pump inspection
Piston Pump Inspection
  • Piston to cylinder clearance is tight (.001 - .002) to increase efficiency
  • Scoring in the bore indicates the pump is ruined
  • Sealing surfaces on the rear of the rotating cylinder must seat properly with no scoring
piston pump inspection1
Piston Pump Inspection
  • Shaft bearings can go bad and will ruin the shaft
  • Shaft seals need to be pliable
other piston pumps
Other Piston Pumps
  • John Deere uses a radial piston pump where the cylinder housing does not move
  • Around the outside of the housing are pistons that are moved up by a cam
  • This type is used on a closed center system