Boom Lift Cylinder - Genie GTH-636 Service Manual

June 2007
REV C
1-3

Boom Lift Cylinder

How to Remove a Lift Cylinder
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 Attach an overhead 10 ton / 10,000 kg crane to
the boom. Support the boom. Do not apply any
lifting pressure.
2 Tag, disconnect and plug the two larger
hydraulic hoses at the lift cylinder and manifold.
Cap the fittings.
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.
Component damage hazard.
Hoses can be damaged if they are
kinked or pinched.
3 Remove the fasteners securing the lift cylinder
pivot pin to the chassis.
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
Section 4 • Repair Procedures
4 Use a soft metal drift to remove the pivot pin.
Crushing hazard. The boom will
fall if not properly supported when
the pivot pin is removed from the
machine.
5 Using the overhead crane, raise the boom to a
horizontal position.
6 Attach a lifting strap from an overhead crane to
the lift cylinder. Support the cylinder. Do not
apply any lifting pressure.
7 Remove the fasteners securing the lift cylinder
collar to the boom. Remove the collar.
8 Remove the cylinder from the machine.
Crushing hazard. The cylinder will
fall if not properly supported when
removed from the machine.
BOOM COMPONENTS
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