7 - 20
DPL-25S • DPL-30S • DPL-35S Super Series
Part No. 40462
September 2016
Section 7 - Repair Procedures
MAST ASSEMBLY
4-5
How to Inspect the Lifting Chains
Inspection Failure
When the length of the
16 links (pin to pin)
measure more than 8.25
inches for
1
/
2
inch chain
or 10.31 inches for
5
/
8
inch chain.
Inspection Remedy
Replace both chains on
that column section.
Replace entire chain. Do
not repair just the
affected portion of the
chain.
Procedure
Count out 16 chain links
and measure pin to pin
centerline dimension with
a steel tape.
Note: Be sure to
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.
Evidence of rust or
corrosion.
When external surfaces
are not protected with a
layer of oil.
Joints that do not flex
freely or are bound up.
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 re-install
chain.
Lubricate chain with
motor oil (SAE 40).
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.
Inspection
Wear
Rust and Corrosion
Tight Joints
