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

Service Manual - First Edition
10-2

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
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 main pump.
2 Close the two hydraulic tank valves located at
the main pump.
open
Part No. 29487
closed
Genie Z-45/22
Section 7 - Repair Procedures
3 Disconnect the hydraulic hoses from the pump
and cap them.
Bodily injury hazard. Spraying
hydraulic oil can perforate 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 and remove the two pump
mounting bolts. Carefully remove the pump.
Be sure to open the two hydraulic
tank valves and prime the pump
after installing the pump.
How to Prime the Pump
1 Gasoline/LPG models: Disconnect the ignition
coil wire and isolate it from ground.
Diesel models: Disconnect the wiring to the
injection pump fuel-on solenoid
2 Crank the engine with the starter motor for 15
seconds.
HYDRAULIC PUMPS
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