Section 4 • Repair Procedures
REV A
June 2007
4 - 50
GS-2668 RT • GS-3268 RT
Part No. 112657
Hydraulic Pump
8-1
Hydraulic Pump
The hydraulic pump is a 2-section, gear-type
pump. Pump number 1 is the pump section which
is closer to the engine and pump number 2 is the
pump section that is farther from the engine. Each
section of the pump has its own relief valve in the
function manifold.
Note: When removing a hose assembly or fitting,
the O-ring on the fitting and/or hose must be
replaced and then torqued to specification during
installation. Refer to Section 2,
Hydraulic Hose and
Fitting Torque Specifications.
How to Test the Hydraulic Pump
1 Tag, disconnect and plug the high pressure
hydraulic hoses from both sections of the
hydraulic 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 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the high pressure port on each section
of the pump.
3
Gasoline/LPG models:
Disconnect the ignition
coil wire from the center of the ignition coil.
Diesel models:
Hold the manual fuel shutoff
lever clockwise in the closed position.
4 Turn the key switch to ground control and pull
out the red Emergency Stop button to the on
position at both the ground and platform
controls.
5 Observe the pressure gauge while cranking the
engine. Immediately stop if the pressure
reaches or exceeds 3000 psi / 206 bar in either
one of the gauges.
Result: If both of the pressure gauges read
3000 psi / 206 bar, immediately stop. The pump
is good.
Result: If pressure fails to reach
3000 psi / 206 bar in one or both sections of the
pump, one of the pump sections or the pump
coupling is bad and will need to be serviced or
replaced.
6 Remove the pressure gauges and connect the
hydraulic hoses.
Summary of Contents for GS-2668 RT
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