Platform Leveling Master Cylinder - Genie Z-30/20N Service Manual

April 2016
4-5
Platform Leveling Master
Cylinder
The platform leveling master cylinder acts as a
pump for the slave cylinder. It is part of the
closed-loop hydraulic circuit that keeps the platform
level through the entire range of primary boom
motion. The platform leveling master cylinder is
located inside the upper mid-pivot at the pivot end
of the primary boom.
How to Remove the Platform
Leveling Master Cylinder
Bodily injury hazard. This
procedure requires specific repair
skills, lifting equipment and a
suitable workshop. Attempting
this procedure without these skills
and tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications, Hydraulic Hose and Fitting Torque
Specifications.
1 Raise the secondary boom until both the rod
end and barrel-end pivot pins of the master
cylinder are accessible.
Part No. 139378
Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
Primary Boom Components
2 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.
3 Attach an overhead crane or similar lifting
device to the master cylinder.
4 Remove the pin retaining fasteners from the
master cylinder barrel-end pivot pin. Use a soft
metal drift to remove the pin.
Crushing hazard. The master
cylinder could become
unbalanced and fall if not
properly attached to the
overhead crane.
5 Remove the pin retaining fastener from the
rodend pivot pin.
6 Place a rod through the rod-end pivot pin and
twist to remove the pin.
7 Remove the master cylinder from the
machine.
Crushing hazard. The master
cylinder could become
unbalanced and fall if not
properly attached to the
overhead crane.
Service Manual
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