Genie GR-12 Service Manual page 66

Section 4 • Repair Procedures
MAST COMPONENTS
How to Inspect the Lifting Chains
Inspection
Wear
Rust and Corrosion
Tight Joints
4 - 18
Procedure
Count out 16 chain links
and measure pin to pin
centerline dimension with
a steel measuring tape.
Note: Measure a section
of chain that moves over
the idler wheels.
Visually inspect the
chains for rust and
corrosion.
Visually inspect the
chains for lubrication.
Inspect chain link joints
for easy movement.
GR-12 • GR-15 • GR-20
Inspection Failure
When the length of the
16 links (pin to pin)
measure more than 8.25
1
inches / 21 cm for / inch
2
/ 12.7mm chain or 10.31
5
inches / 26.1 cm for /
8
inch / 15.9 mm chain.
Eviden
ce of rust or
corrosion.
When external surfaces
are not protected with a
layer of oil.
Joints that do not flex
freely or are binding.
November 2005
REV B
Inspection Remedy
Replace both chains
on that column.
Replace entire chain.
Do not repair just
the
affected portion of the
chain.
Remove chain and
inspect for cracked plates
(see inspection of
cracked plates). If no
cracks are found,
lubricate chain with motor
oil (SAE 40) and install
chain.
Lubricate chain with
motor oil (SAE 40W).
If rust and corrosion is
found, refer to Failure
Remedy for rust and
corrosion.
If link plates or pins are
bent or deformed,
replace entire chain.
Replace both chains on
that column. Do not
repair just the affected
portion of the chain.
Continued to the next page
Part No. 84700