Drive Pump - Genie S-40 Service Manual

Section 4 • Repair Procedures
HYDRAULIC PUMPS
6-2

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 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 2, Hydraulic Hose
and Fitting Torque Specifications.
1 Disconnect the electrical connection at the
electro-proportional controller located on the
drive pump.
4 - 22
2 Models with hydraulic tank shut-off valves:
Locate the two hydraulic tank valves at the
hydraulic tank through the access hole
underneath the turntable. Close the valves.
Models without hydraulic tank shut-off
valves: Remove the drain plug from the
hydraulic tank and completely drain the tank
into a suitable container. See capacity
specifications.
3 Tag and disconnect and plug the hydraulic
hoses from the drive and function pumps.
Cap the fittings on the pumps.
Genie S-40 and Genie S-45
open closed
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.
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.
January 2005
REV A
Part No. 102521