User Manual
P/N: 192047082 (REV AA) 627NH January 2018
16
INSPECTING THE LOAD CHAIN:
The chain must be inspected at regular intervals, with
a minimum of once annually. As the frequency of use
increases, the time intervals between inspections must be
reduced. During inspection, the chain must be examined
along their entire length, including the hidden parts. If the
lifting equipment is frequently used with a constant lifting
distance or in other words the switch from upward to
downward often takes place in the same area, a particularly
thorough inspection and lubrication is required in that area.
Worn chain can be an indication of worn hoist components.
For this reason, the hoist’s chain guides, hook blocks
and liftwheel (sprocket) should be examined for wear and
replaced as necessary when replacing chain.
1. Check to see if chain is dirty or poorly lubricated.
2. Clean the chain with a non-caustic/non-acid type solvent
and make a link by link inspection for wear or cracks in
the links, twisted or deformed links. Chain with any one
of these defects must be replaced.
3. Slack the portion of the chain that normally passes over
the liftwheel (sprocket) or idler sprocket on multi-reeved
hoist. Examine the chain links for wear ( see gure 10).
If the wire diameter anywhere on the link measures less
than 90% of the nominal wire diameter, the chain must
be replaced.
Figure 10. Chain Wear Areas
Table 9. Chain Dimensions
Models P D
A, AA, B, C, E, F, H
.745" (18.9mm) .250" (6.3mm)
Figure 11. Gaging Load Chain Wear
4. Based upon ASME B30.16, 2012 chain should also
be checked for elongation. Select an unworn,
un-stretched length of the chain (at the slack end for
example).Suspend the chain vertically under tension
and using a knife blade caliper type gauge, measure the
outside length of any convenient number of links, 11 is
recommended. Measure the same number of links in the
used sections and calculate the percentage in increased
length. The chain should be replaced if the length of the
used portion is more than 2% longer than the unused
portion of the chain. Also, if the pitch of any individual
link has elongated by more than 5%,the chain should
be replaced.
Figure 12. Chain Embossing
Use only Star (*) grade load chain and original
replacement parts. Use of other chain and parts
may be dangerous and voids factory warranty.
IMPORTANT: Do not use replaced chain for other purposes
such as lifting or pulling. Load chain may break suddenly
without visual deformation. For this reason, cut replaced
chain into short lengths to prevent use after disposal.
Use of commercial or other manufacturer’s chain and parts to
repair CM hoists may cause load loss.
TO AVOID INJURY:
Use only CM supplied replacement load chain and parts. Chain
and parts may look alike, but CM chain and parts are made of
specic material or processed to achieve specic properties.
P = Nominal Pitch
D = Nominal Wire Diameter