Genie TMZ-50/30 Service Manual page 76

Section 4 • Repair Procedures
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PRIMARY BOOM COMPONENTS
How to
Remove the Slave Cylinder
The slave cylinder, via a closed-circuit hydraulic
loop, works in tandem with the master cylinder to
maintain the platform in a level condition through
the entire range of boom motion. The slave
cylinder, located at the platform end of the
extension boom, is equipped with counterbalance
valves to prevent movement in the event of a
hydraulic line failure.
Before cylinder removal is
considered to correct a
malfunction, bleed the slave
cylinder to be sure there is no air
in the closed loop hydraulic circuit.
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 Extend the boom approximately 1 foot / 30 cm.
2 Tag, disconnect and plug the slave cylinder
hydraulic hoses from the tee fittings on the jib
manifold, and connect them together using a
connector. Cap the fittings on the 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.
4 - 22
a
a
b
3 Remove the pin retaining fastener from
the slave cylinder rod end pivot pin. Do not
remove the pin.
4 Remove the external retaining rings from the
barrel end pivot pin.
5 Using a soft metal drift, remove the rod end
pivot pin.
6 Using a soft metal drift, remove the barrel end
pivot pin.
7 Carefully pull the cylinder out of the boom.
Component damage hazard.
Hoses can be damaged if they are
kinked or pinched.
How to Bleed the Slave Cylinder
1 Raise the boom to a horizontal position.
2 Activate the platform level function in both up
and down directions through two complete
platform leveling cycles to remove any air that
might be in the system.
The 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 boom motion. The master cylinder
is located inside the mid pivot.
TMZ-50/30
June 2005
REV B
b
platform level master cylinder
platform level slave cylinder
Part No. 65162