Hydraulic Pumps; Function Pumps - Genie S-100 Service And Repair Manual

March 2017
9-1

Function Pumps

There are three hydraulic pumps connected to
the engine. There is one variable displacement
pump that is used for drive functions and two fixed
displacement pumps attached to the drive pump
that are used for all other machine functions.
How to Remove the
Function Pumps
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 Specifications, Hydraulic
Hose and Fitting Torque Specifications.
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
closed
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.
Part No. 1268494
closed
position or component
S-100 • S-105 • S-120 • S-125
Section 3 • Repair Procedures

Hydraulic Pumps

2 Tag, disconnect and plug the hydraulic hoses
from the 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.
3 Support the function pumps with an overhead
crane or other suitable lifing device.
4 Remove the pump mounting bolts. Carefully
remove the pumps.
Crushing hazard. The function
pumps may become unbalanced
and fall when the mounting
bolts are removed if they are not
properly supported.
Component damage hazard.
Be sure to open the two hydraulic
tank valves and prime the pumps
after installing the pumps.
See 9-2, How to Prime the Pumps.
3 - 71