Platform Components; Platform Leveling Slave Cylinder - Genie S-40 Service Manual

Section 4 • Repair Procedures

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 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: Before cylinder removal is considered, bleed
the slave cylinder to be sure there is no
air in the closed loop.
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 2, Hydraulic Hose and Fitting
Torque Specifications.
1 Extend the primary boom until the slave cylinder
barrel-end pivot pin is accessible.
2 Raise the primary boom slightly and place
blocks under the platform for support.
3 Lower the primary boom until the platform is
resting on the blocks just enough to support the
platform.
Note: Do not rest the entire weight of the boom on
the blocks.
4 Protect the slave cylinder rod from damage.
4 - 8
S-40 Models:
5 Tag, disconnect and plug the hydraulic hoses
from the slave cylinder at the union located
near the platform rotate counterbalance valve
manifold and connect them together using a
connector. Cap the fittings on the cylinder.
S-45 Models:
6 Tag, disconnect and plug the slave cylinder
hoses at the union.
7 Pull the slave cylinder hoses through the
platform rotator.
8 Remove the pin retaining fastener from
the slave cylinder rod-end pivot pin. Do not
remove the pin.
9 Remove the external retaining fastener from the
barrel-end pivot pin.
10 Use a soft metal drift to drive the rod-end pivot
pin out.
11 Use a soft metal drift and drive the barrel-end
pin out.
12 Carefully pull the cylinder out of the boom.
How to Bleed the Slave Cylinder
Note: Do not start the engine. Use auxiliary power
for this procedure.
1 Raise the primary boom to a horizontal position.
2 Move the platform level toggle switch up and
down through two platform leveling cycles to
remove any air that might be in the system.
S-40 • S-45
October 2013
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.
Component damage hazard. Hoses
can be damaged if they are kinked
or pinched.
Part No. 102521