Hydraulic Pumps; Auxiliary Pump - Genie Z-25/8 Service Manual

First Edition • Third Printing
6-1

Auxiliary Pump

How to Test the Auxiliary Pump
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 and plug the high pressure
hydraulic hose from the auxiliary pump at the
function manifold.
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.
2 Connect a 0 to 5000 psi (0 to 345 bar) pressure
gauge to the high pressure port from the pump.
3 Turn the key switch to ground control and pull
out the Emergency Stop button to the
position.
Part No. 41314
ON
Genie Z-20/8N & Genie Z-20/8 & Genie Z-25/8
Section 7 • Repair Procedures

Hydraulic Pumps

4 Activate any function using auxiliary power.
Result: If the pressure gauge reads 3500 psi
(241 bar), immediately stop. The pump is good.
Result: If pressure fails to reach 3500 psi
(241 bar), the internal relief valve setting is
incorrect or the pump is bad and will need to be
serviced or replaced.
5 Remove the pressure gauge and reconnect the
hydraulic hose.
How to Remove the Auxiliary
Pump
1 Open both battery trays and disconnect the
battery packs from the machine.
2 Support the ground controls side battery tray
with a forklift or suitable lifting device.
3 Remove the retaining fasteners that attach the
roller stop blocks to the battery pack tray
slides. Remove the roller stop blocks.
4 Carefully slide the battery tray out of the
chassis.
Crushing hazard. If the battery
tray is not properly supported, it
may become unbalanced and fall
when it is removed from the
machine.
7 - 23