Service and Repair Manual
November 2016
Hydraulic Pump
42
GS-2669 DC • GS-3369 DC • GS-4069 DC
Part No. 1272220GT
H ydr auli c Pump
5-1 H ydr aulic Pump
5-1
Hydraulic Pump
The hydraulic pump is a single section, gear-type
pump.
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications,
Hydraulic Hose and Fitting Torque
Specifications.
How t o T est t he Hydr aulic Pump
How to Test the Hydraulic Pump
1
Connect a 0 to 5000 psi / 0 to 350 bar
pressure gauge to test port #1 (TP1) on the
function manifold.
2
Remove the platform controls from the
platform and place the controls near the
function manifold on the tank side of the
machine.
3
Steer the machine fully to the right or left and
hold. Note the pressure reading on the
pressure gauge. Refer to Specifications,
Hydraulic Specifications
.
How t o R emove t he Hydr aulic Pump
How to Remove the Hydraulic
Pump
1
Tag, disconnect and plug the hydraulic hoses
on the pump. Cap the fittings on the pump.
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to
squirt or spray.
2
Remove the pump mounting bolts. Carefully
remove the pump.
Component damage hazard.
After replacing the hydraulic
pump, it is critical to return the lift
and drive speed settings to
original factory specifications.
Refer to Specifications,
Performance Specifications
.
