Genie GRC-12 Service Manual

Section 4 • Repair Procedures
REV A
September 2016
Part No. 227123 GRC 4 - 41
28 Carefully collapse the mast assembly.
29 Attach a lifting strap from an overhead crane to
the lift cylinder. Working from the lower half of
the mast assembly, carefully slide the lift
cylinder into the mast assembly, aligning the
rod ends of the cylinder, to the cylinder mast
mounting brackets at the upper half of the mast
assembly.
Crushing hazard. The lift cylinder
could become unbalanced and fall
if not properly supported.
Note: During installation, the overhead crane strap
will need to be carefully adjusted for proper
balancing.
30 Working at the upper half of the mast assembly,
securely install the lift cylinder nylock nuts onto
the lift cylinder. Torque to 300 ft-lbs / 406 Nm.
31 Working from the lower half of the mast
assembly, install the mast cylinder pin into the
mounting holes of the number 1 mast and the
lift cylinder.
32 Install the hair pin clips onto each side of the
mast cylinder pin.
33 Securely install the lift cylinder retaining bolt
onto the lower cylinder block. Do not over
tighten the bolt.
34 Using the appropriate fasteners, install the limit
switch assembly onto the lower half of the mast
assembly. Do not over tighten the fasteners.
Refer to Illustration 10.
35 Securely install the hydraulic lift hose onto the
lift cylinder. Refer to the note below for torque
specifications.
Note: When installing 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.
10-2
Wear Pads
Wear pads on the GRC-12 are used to provide a
uniform fit between the mast sections, as the mast
assembly extends and retracts. Over time, it may
be necessary to replace the wear pads to ensure
good machine performance.
How to Replace Wear Pads
1 See 10-1, How to Remove the Mast Assembly
and How to Disassemble a Mast.
2 See 10-1, How to Assemble a Mast.
MAST COMPONENTS

Genie GRC-12 Specifications

General

Brand	Genie
Model	GRC-12
Category	Lifting Systems
Language	English