Service Manual May 2018
Mast Components
82 GR
™
• QS
™
R • QS
™
W Part No. 1275811GT
10 Lay the number 3 column chains on the floor.
Note: Do not allow the chains to become twisted or
dirty.
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.
Note: 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.
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.
nent damage hazard.
The roller wheels may be
damaged if the idler wheel axle
mounting fasteners are not flush
with the column.
18 Install the mast assembly on the drive chassis.
Adjust the lifting chains. Refer to Repair
Procedure, How to Adjust the Lifting Chains.
10-2
Glide Pads
Glide pads, used on the GR-12, GR-15, QS-12R,
QS-15R, QS-12W and QS-15W, and wear pads
used on the GR-20, QS-20R and QS-20W, are
used to provide a uniform fit between the columns
as the mast extends and retracts. Over time, it may
be necessary to adjust the glide pads to ensure
good machine performance.
Wear pads are not adjustable and do not require
servicing on the GR-20, QS-20R and QS-20W.
How to Adjust the Glide Pads
1 Locate the upper and lower glide pad
adjustment bolts below each upper roller bolt,
on both sides of each column.
2 Hold the glide pad adjustment bolt and loosen
the lock nut on all glide pads.
3 Turn the glide pad adjustment bolt clockwise
until the glide pad makes contact with the
column. Adjust the glide pads on both sides of
all columns. Be sure the sides of the columns
are even to within 1/8 inch / 3 mm of each
other.
4 On the number 1 column, secure the upper
and lower glide pad bolts on both sides of the
mast. Hold the glide pad adjustment bolt and
torque the lock nut to 12 in-lbs / 1.35 Nm. Be
sure the glide pad bolt does not turn.
5 Repeat step 4 for the upper and lower glide
pads on both sides of the each column of the
mast, Start with the number 2 column and
work toward the carriage.
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