Secondary Boom Lift Cylinder - Genie TMZ-50/30 Service Manual

Section 4 • Repair Procedures
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SECONDARY BOOM COMPONENTS
5-2

Secondary Boom Lift Cylinder

How to Remove the
Secondary Boom Lift Cylinder
The secondary boom lift cylinder raises and lowers
the secondary boom. The secondary boom lift
cylinder is equipped with a counterbalance valve to
prevent movement in the event of a hydraulic line
failure.
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 secondary boom to a horizontal
position.
2 Disconnect the battery pack from the machine.
Electrocution hazard. Contact with
electrically charged circuits could
result in death or serious injury.
Remove all rings, watches and
other jewelry.
3 Attach a lifting strap of suitable capacity from an
overhead 5 ton / 5000 kg crane to the mid pivot.
4 Attach a lifting strap of suitable capacity from an
overhead crane to the rod end of the secondary
boom lift cylinder.
5 Remove the pin retaining fasteners from the lift
cylinder rod-end pivot pin.
4 - 26
6 Use a soft metal drift to remove the lift cylinder
rod-end pivot pin.
Crushing hazard. The cylinder
may fall if not properly supported
when the pivot pin is removed.
7 Lower the cylinder onto the turntable.
8 Tag, disconnect and plug the hydraulic hoses
on the lift 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.
9 Remove the fasteners securing the ground
control box to the control box mount.
10 Lay the ground control box off to the side.
Component damage hazard. Use
caution when removing the ground
control box so as not to damage
the wire harness or connectors.
11 Remove the pin retaining fasteners from the lift
cylinder barrel-end pivot pin.
12 Place a rod through the barrel-end pivot pin and
twist to remove the pin. Remove the cylinder
from the machine.
Crushing hazard. The lift cylinder
may become unbalanced and fall
if not properly supported when
removed from the machine.
TMZ-50/30
June 2005
REV B
Part No. 65162