Drive Pump - Genie Z80/60 Service Manual

Section 4 • Repair Procedures
HYDRAULIC PUMPS
7-2

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. Any internal service
to the pump should only be performed at an
authorized Sauer-Danfoss service center. Contact
the 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.
Note: 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 2, Hydraulic Hose and
Fitting Torque Specifications.
1 Disconnect the wire harness at the electronic
displacement controller (EDC), located on the
drive pump.
4 - 62
2 Models without hydraulic tank shutoff
valves: Remove the drain plug from the
hydraulic tank and completely drain the tank
into a suitable container. Refer to Section 2,
Specifications .
Models with hydraulic tank shutoff valves:
Close the two hydraulic tank valves located at
the hydraulic tank.
Component damage hazard. The
engine must not be started with
the hydraulic tank shutoff 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, disconnect and plug the hydraulic hoses at
the drive and function pumps. Cap the fittings
on the pumps.
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.
Z-80/60
June 2011
REV B
open closed
Part No. 88619