Genie Z-34/22IC, Руководство по обслуживанию

Страница: 90 / 185

4 - 18 Z-34/22 IC Part No. 128267
July 2007 Section 4 • Repair Procedures
REV A PRIMARY BOOM COMPONENTS
4-3
Primary Boom Lift Cylinder
The lift cylinder raises and lowers the primary
boom. The lift cylinder is equipped with
counterbalance valves to prevent movement in the
event of a hydraulic line failure.
How to Remove the Primary
Boom Lift Cylinder
Bodily injury hazard. This
procedure requires specific repair
skills, lifting equipment and a
suitable workshop. Attempting this
procedure without these skills and
tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
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 Raise the primary boom enough to access the
primary boom lift cylinder rod-end pivot pin.
2 Raise the secondary boom enough to access
the primary boom lift cylinder barrel-end
pivot pin.
3 Attach a lifting strap from an overhead crane to
the primary boom for support. Do not apply any
lifting pressure.
4 Place a block of wood across the upper
secondary boom to support the cylinder when
the rod-end pivot pin is removed.
5 Attach a lifting strap from a second overhead
crane or other similar lifting device to the
primary boom lift cylinder.
6 Remove the rear turntable cover.
7 Place a 4x4 inch / 10 x 10 cm block between
the lower compression arms and the cross
member of the upper secondary boom.
Carefully lower the secondary boom onto the
block.
Crushing hazard. Keep hands
away from the block and all
moving parts when lowering the
secondary boom.
8 Remove the pin retaining fasteners from the
primary boom lift cylinder rod-end pivot pin. Use
a soft metal drift to remove the pin.
Crushing hazard. The primary
boom could fall when the primary
boom lift cylinder rod-end pivot pin
is removed if not properly
supported by the overhead crane.
9 Lower the rod end of the cylinder onto the
blocks that were placed on the upper
secondary boom.
10 Remove the pin retaining fasteners from the
upper compression arm pivot pin (same side of
machine as the primary boom lift cylinder
barrel-end pivot pin retaining fasteners).