Genie Z-34/22IC, Service Manual

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4 - 6 Z-34/22 IC Part No. 128267
July 2007 Section 4 • Repair Procedures
REV A
Platform Components
2-1
Platform Leveling Slave Cylinder
The slave cylinder and the rotator pivot are the
two primary supports for the platform. The slave
cylinder keeps the platform level through the
entire range of primary boom motion. It operates in
a closed-circuit hydraulic loop with the master
cylinder. The slave cylinder is equipped with
counterbalance valves to prevent movement in
the event of a hydraulic line failure.
How to Remove the Platform
Leveling Slave Cylinder
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or the
hose end must be replaced. All connections must
be torqued to specification during installation.
Refer to Section 2,
Hydraulic Hose and Fitting
Torque Specifications.
Note: Before cylinder removal is considered, bleed
the slave cylinder to be sure there is no air in the
closed loop.
1 Extend the boom until the slave cylinder
barrel-end pivot pin is accessible.
2 Raise the boom slightly and place blocks under
the platform for support. Lower the boom until
the platform is resting on the blocks.
3 Remove the pin retainer fastener from the
rod-end pivot pin.
4 Remove the external snap ring from the
barrel-end pivot pin.
5 Use a soft metal drift to remove the rod-end
pivot pin.
6 Use a soft metal drift to remove the barrel-end
pivot pin.
7 Carefully pull the cylinder out of the boom.
8 Tag and disconnect the hydraulic hoses from
the slave cylinder and connect them together
with a connector. 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.
How to Bleed the Slave Cylinder
1 Raise the jib boom to a horizontal position.
2 Activate the platform level toggle switch up and
down through two platform leveling cycles to
remove any air that might be in the system.