Drive Hydraulic Pump - Genie Z-45/22 Service Manual

Section 7 - Repair Procedures
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HYDRAULIC PUMPS
How to Remove the
Lift/Steer Pump
1 Close the two hydraulic tank valves located at
the hydraulic tank.
open
Component damage hazard. The
engine must not be started with
the hydraulic tank shutoff valves
in the
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.
2 Disconnect and plug the lift/steer pump
hydraulic hoses. Cap the fittings.
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.
3 Remove the pump mounting bolts. Carefully
remove the pump.
Component damage hazard.
Be sure to open the two hydraulic
tank valves and prime the pump
after installing the pump.
7 - 38
closed
position or
CLOSED
Genie Z-45/22
Service Manual - Second Edition
9-2

Drive Hydraulic Pump

The drive hydraulic 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.
How to Remove the Drive
Hydraulic 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.
1 Disconnect the electrical connection at the
electronic displacement controller (EDC)
located on the drive pump.
2 Close the two hydraulic tank valves located at
the hydraulic tank.
open
Component damage hazard. The
engine must not be started with
the hydraulic tank shutoff valves
in the
CLOSED
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.
closed
position or
Part No. 32960