Main Function Pump - Genie Z-25/8 Service Manual

Section 7 • Repair Procedures
HYDRAULIC PUMPS
5 Tag and disconnect the power cables from the
auxiliary power unit.
Electrocution hazard. Contact with
electrically charged circuits could
result in death or serious injury.
Remove all rings, watches and
other jewelry.
6 Tag, disconnect and plug the hydraulic hoses
from 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.
7 Remove the auxiliary power unit mounting
fasteners. Carefully remove the auxiliary power
unit.
8 Remove the pump mounting bolts. Remove the
pump from the electric motor.
7 - 24 Genie Z-20/8N & Genie Z-20/8 & Genie Z-25/8
6-2

Main Function Pump

How to Test the Main Function
Pump
The main function pump has 2 sections. One
section is used for boom and steer functions, and
when driving the output of both sections are
combined.
When removing a hose assembly
or fitting, the O-ring on the fitting
and/or hose end must be replaced
and then torqued to specification
during installation.
Refer to Section Two, Hydraulic
Hose and Fitting Torque
Specifications.
1 Disconnect and plug the high pressure
hydraulic hose from the section closest to the
electric motor on the main function 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 345 bar) pressure
gauge to the high pressure port on the pump.
First Edition • Third Printing
Part No. 41314