3-26
GTH-5519
Part No. 1272852
September 2016
Section 3 • Repair Procedures
6-2
Hydrostatic Transmission
Pump
How to Test the Hydrostatic
Transmission Pump
Note: Perform this procedure on a firm, level
surface, with the boom in the stowed position and
service brake pedal engaged.
1 Connect a 0 to 8700 psi / 0 to 600 bar pressure
gauge to port TP2 (hydrostatic transmission
high pressure test port).
2 Connect a 0 to 870 psi / 0 to 60 bar pressure
gauge to port TP3 (hydrostatic transmission
boost pressure test port).
3 Start the engine.
Result: the pressure gauge connected to test
port TP3 reads 360 psi / 25 bar.
Pressure is not within specification.
Contact Genie Service Department.
4 Increase the engine speed to 1200 rpm.
5 Engage forward or reverse gear.
Result: the pressure gauge connected to test
port TP2 reads 725 psi / 50 bar.
Pressure is not within specification.
Adjust the high pressure relief valve "
a
" located
above the pump.
6 Increase the engine speed to maximum rpm.
Result: the pressure gauge on test port TP2
reads 7180 psi / 495 bar.
Pressure is not within specification.
Adjust the high pressure relief valve "
b
" located
above the pump.
7 While observing the pressure gauge connected
to test port TP3, operate the engine between
1200 rpm and maximum rpm.
Result: the pressure gauge on test port TP3
does not go below 360 psi / 25 bar.
Pressure is not within specification.
Contact Genie Service Department.
HYDRAULIC PUMPS
b
a
