Genie GR-12 Service Manual page 64

Section 4 • Repair Procedures
MAST COMPONENTS
How to Assemble the Mast
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.
1 Thoroughly clean all columns.
2 Secure the number 1 column to the work table
and lay the chains out on the floor.
Do not allow the chains to become
twisted or dirty.
3 Apply a generous amount of Boe-lube wax to
the inside and outside channels of each
column.
4 Slide the number 2 column into the number 1
column.
5 Lay the number 2 column chains on the floor.
Do not allow the chains to become
twisted or dirty.
6 Lay the number 1 column chains inside the
number 2 column.
7 Slide the number 3 column into the number 2
column.
8 When the number 3 column is almost all the
way in, guide the number 1 column chains into
the chain tension rocker on the number 3
column.
9 Install the adjustment nuts on the number 1
column chains. Tighten the adjustment nuts
until the lifting chains have equal tension and
the chain tension rocker is centered in the
inspection hole in the column.
4 - 16
10 Lay the number 3 column chains on the floor.
11 Lay the number 2 column chains inside the
number 3 column.
12 Follow steps 4 through 11 for each remaining
column and the carriage.
13 After all the columns are assembled, the idler
wheel assemblies can be installed.
14 Remove the tension from the lifting chains on
the number 2 column by pushing the number 3
column towards the top of the mast.
15 Install the idler wheel assembly in the top of the
number 2 column. Tighten the mounting
fasteners.
16 Repeat steps 14 and 15 for each remaining
idler wheel assembly.
17 Confirm that all of the idler wheel axle mounting
fasteners are flush with the column.
18 Install the mast assembly on the drive chassis.
Adjust the lifting chains. See 3-3, How to Adjust
the Lifting Chains.
GR-12 • GR-15 • GR-20
November 2005
Do not allow the chains to become
twisted or dirty.
Confirm that all idler wheels rotate
smoothly with no excessive side
movement, or rub on the inside of
the column. Replace worn shims if
necessary.
Component damage hazard. The
roller wheels may be damaged if
the idler wheel axle mounting
fasteners are not flush with the
column.
Part No. 84700
REV B