Hydraulic Pumps; Hydraulic Pump - Genie GTH-1048 Service Manual

March 2015
6-1

Hydraulic Pump

How to Test the Function Pump
Note: When removing a hose assembly or fitting,
the fitting and/or hose end must be torqued to
specification during installation. Refer to Section 2,
Hydraulic Hose and Fitting Torque Specifications.
1 Tag, disconnect and plug the high pressure
hydraulic hose from the primary function
manifold. Cap the fitting on the main valve.
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.
Note: The high pressure hose is the smaller of the
two hoses.
2 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to the high pressure hose disconnected
in step 1.
3 Hold the manual fuel shut-off lever on the
engine in the closed position.
Part No. 123701
Hydraulic Pump
4 Observe the pressure gauge while cranking the
engine in one second intervals.
Result: If the pressure gauge reads
3190 psi / 220 bar, immediately stop. The pump
is good.
Result: If the pressure fails to reach
3190 psi / 220 bar, the pump needs to be
adjusted OR or the pump or pump coupling is
faulty and will need to be serviced or replaced.
5 Remove the pressure gauge and install the high
pressure hose onto the pump. Torque to
specification. Refer to Section 2, Specifications .
GTH-1048 • GTH-1056
Section 4 • Repair Procedures
Component damage hazard.
There is no relief valve in the
hydraulic pump and the pump can
be damaged if the pressure is
allowed to exceed specification.
When testing the pump, crank the
engine in one second intervals
until the correct pressure is
confirmed. Do not over-pressurize
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.
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