Terex Genie Z-33/18, Service And Repair Manual

Page: 35 / 117

January 2020
Part No. 1268514GT Z
®
-33/18 3-13
Section 3 • Repair Procedures
Platform Components
The slave cylinder and the platform mount are
the two primary supports for the platform. The
slave cylinder keeps the platform level through
the entire range of primary boom motion. It
operates in a closed loop hydraulic circuit with the
master cylinder. The slave cylinder is equipped
with counterbalance valves to prevent platform
movement in the event of a hydraulic line failure.
Before cylinder removal is considered, 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 2,
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.
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
.
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.
WARNING
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.
WARNING
Crushing hazard . The slave
cylinder could fall if not properly
supported.
1 Raise the primary boom to a horizontal
position.
2 Move the platform level toggle switch up and
down - holding it in each position for at least 2
seconds - through two platform leveling cycles
to remove any air that might be in the system.