Checklist D Procedures; Inspect The Mast Assembly For Wear - Terex Genie GR -12 Service Manual

Section 3 • Scheduled Maintenance Procedures

Checklist D Procedures

D-1
Inspect the Mast Assembly
for Wear
Genie specifications require that this procedure
be performed every 1000 hours or annually,
whichever comes first.
Detection of excessive or unusual wear in the mast
assembly is essential for safe machine operation.
An unsafe working condition exists if the mast
assembly has excessive wear and/or does not
operate smoothly, free of hesitation and binding.
1 Remove the mast covers.
a
b
GR-15 shown
a mast cover
b idler wheel
c spacer
3 - 28
2 Raise the platform until approximately
4 inches / 10 cm of each column is visible.
3 GR-12 and GR-15: Visually inspect the top of
each column for clearance between the roller
wheels and the adjacent column surface.
GR-20: Visually inspect the top of each column
for clearance between the slider block and the
adjacent column surface.
Result: There should be an equal amount of
distance between the roller wheel/slider block
and the column on each side.
Note: If mast inspection results in a measurement
that is not within specification, refer to Repair
procedure 3-2, How to Adjust the Glide Pads.
4 Loosen but do not remove the adjustment nut
on the sequencing cable located at the top of
the first column.
5 Raise the platform approximately 3 feet / 1 m
above the top of the drive chassis.
c
6 Place a jack stand on the top of the battery
cover, centered under the platform. Adjust the
jack stand height to 24 inches / 60 cm.
7 Lower the platform onto the jack stand just
enough to take the weight off the lifting chains.
GR • QSR • QSW
September 2009
Crushing hazard. Keep hands
clear of the jack stand when
lowering the platform.
Part No. 84700
REV D