Drive Pump - Genie Z-45/25 Service Manual

First Edition • Second Printing
11-2

Drive Pump

The drive pump is a bi-directional variable
displacement piston pump. The pump output is
controlled by the electronic displacement controller
(EDC), 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
Sundstrand-Sauer service center. Call Genie
Industries Service Department to locate your local
authorized service center.
How to Remove the Drive Pump
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.
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 the electrical connection at the
electronic displacement controller (EDC)
located on the drive pump.
Part No. 52709
2 Locate the two hydraulic tank valves at the
hydraulic tank through the access hole
underneath the turntable, then close the valves.
3 Tag and disconnect and plug the hydraulic
hoses from the drive and lift/steer pumps. Cap
the fittings on the pumps.
4 Support the pump with a lifting device and
remove the two drive pump mounting fasteners.
5 Carefully pull the drive pump out until the pump
coupler separates from the flex plate.
Genie Z-45/25 & Genie Z-45/25J
Section 7 • Repair Procedures
HYDRAULIC PUMPS
open closed
Component damage hazard. The
engine must not be started with
the hydraulic tank shutoff valves in
the position or component
CLOSED
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.
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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