Genie Z-51/30J, Service And Repair Manual

Page: 31 / 144

October 2020
Part No. 1268553GT Z®-51/ 31J 21
Service and Repair Manual
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 (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications, H
ydraulic 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 Tag, disconnect and plug the hydraulic hoses
from the slave cylinder at the unions and
connect them together using a connector.
Connect the hoses from the cylinder together
using a connector.
WARNING
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
.
5 Remove the pin retaining fastener from the
slave cylinder rod-end pivot pin. Do not remove
the pin.
6 Remove the external snap rings from the slave
cylinder barrel-end pivot pin. Do not remove the
pin.
7 Place a block under the slave cylinder for
support. Protect the cylinder rod from damage.
8 Use a soft metal drift to drive the rod-end pivot
pin out.
WARNING
Crushing hazard. The platform
could fall when the slave cylinder
rod-end pivot pin is removed if
not properly supported.
NOTICE
Component damage hazard.
The slave cylinder rod may
become damaged if it is allowed
to fall if not properly supported
by the lifting device.
9 Use a soft metal drift and drive the barrel-end
pin out.
10 Carefully pull the cylinder out of the primary
boom.
Platform Controls