Platform Leveling Master Cylinder - Genie S-40 Service Manual

October 2013
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Platform Leveling
Master Cylinder
The master cylinder acts as a pump for the slave
cylinder. It is part of the closed circuit hydraulic
loop that keeps the platform level through the
entire range of boom motion. The master cylinder
is located at the base of the boom.
How to Remove the Platform
Leveling Master Cylinder
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 Section Two, Hydraulic Hose
and Fitting Torque Specifications.
1 Remove the turntable end cover to access the
master cylinder.
2 Raise the boom until the master cylinder
rod-end pivot pin is accessible.
3 Tag, disconnect and plug the master cylinder
hydraulic hoses. Cap the fittings on the
cylinder.
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.
Part No. 102521
4 Attach a lifting strap from an overhead crane to
the lug on the rod end of the master cylinder.
5 Remove the pin retaining fasteners from the
master cylinder barrel-end pivot pin.
6 Place a rod through the barrel-end pivot pin and
twist to remove the pin.
7 Remove the pin retaining fastener from the rod-
end pivot pin.
8 Use a soft metal drift to remove the pin.
9 Remove the master cylinder from the machine.
S-40 • S-45
Section 4 • Repair Procedures
BOOM COMPONENTS
Crushing hazard. The master
cylinder could become unbalanced
and fall if it is not properly attached
to the overhead crane.
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