Genie S-80, Service And Repair Manual

Page: 42 / 305

Service and Repair Manual October 2016
Platform Components
26 S-80 • S-85 • S-80X Part No. 1269074
2-2
Platform Leveling 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 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 (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.
How t o R emove t he Pl atf or m Leveling Slave C yli nder
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 Remove the pin retaining fastener from the
slave cylinder rod-end pivot pin. Use a soft
metal drift to drive the rod-end pivot pin out.
Crushing hazard. The jib boom
could fall when the slave cylinder
rod-end pivot pin is removed if
not properly supported.
5 Remove the external snap rings from the
barrel-end pivot pin.
6 Use a soft metal drift to drive the barrel-end
pivot pin out.
7 Carefully pull the cylinder out of the primary
boom to access the hydraulic hoses.
8 Tag, disconnect and plug the hydraulic hoses
from the slave cylinder. 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 t o Bleed t he Sl ave C ylinder
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.