Genie Z-51/30J, Service And Repair Manual

Page: 59 / 144

October 2020
Part No. 1268553GT Z®-51/ 31J 49
Service and Repair Manual
Hydraulic Pumps
7-2
Drive Pump
The drive pump is a bi-directional variable
displacement piston pump. The pump output is
controlled by the electro-proportional controller,
located on the pump. The only adjustment that
can be made to the pump is the neutral or null
adjustment. Any internal service to the pump
should only be performed at an authorized Eaton
Hydraulics center. Call Genie Service Department
to locate your local authorized service center.
How to Remove the Drive
Pump
NOTICE
Component damage hazard. The
work area and surfaces where
this procedure will be performed
must be clean and free of debris
that could get into the hydraulic
system and cause severe
component damage. Dealer
service is recommended.
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.
1 Disconnect the electrical connectors at the
electrical proportional controller located on the
drive pump.
2 Locate the two hydraulic tank valves at
the hydraulic tank through the access hole
underneath the turntable. Close the valves.
NOTICE
Component damage hazard.
The engine must not be started
with the hydraulic tank shut-off
valves in the closed position or
component damage will occur.
If the tank valves are closed,
remove the key from the key
switch and tag the machine
to inform personnel of the
condition.
3 Tag and disconnect and plug the hydraulic
hoses from the drive and lift/steer pumps. Cap
the fittings on the pumps.
WARNING
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.
4 Support the pump with a lifting device and
remove the two drive pump mounting fasteners.