Terex Genie Z-34/22DC, Service Manual

Page: 62 / 188

April 2016 Service Manual
Platform Components
Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22
• Z-34/22N
49
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,
Hydraulic Hose and Fitting Torque
Specifications.
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 Tag and disconnect the hydraulic hoses to the
slave cylinder at the union and connect them
together with a connector. Cap the fittings on
the cylinder hoses.
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 Remove the external snap rings from the
rod-end pivot pin. Do not remove the pin.
5 Remove the external snap rings from the
barrel-end pivot pin.
6 Place a block of wood under the barrel of the
slave cylinder for support.
7 Use a soft metal drift to remove the rod-end
pivot pin.
Crushing hazard. The platform
could fall if not properly
supported.
8 Use a soft metal drift to remove the barrel-end
pivot pin.
9 Carefully pull the cylinder with hydraulic hoses
out of the boom.
How to Bleed the Slave Cylinder
1 Raise the jib 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.