Product Manual

9
7.0 Load Chain and Bottom Hook
7.1 Load Chain Inspection (all models)
Over time, the load chain will wear or elongate.
This can cause damage to the hoist, breakage, or
non-engagement of the load sheave.
Do not operate the hoist with a
twisted, kinked or damaged load chain. Do not
splice the load chain. Check the chain for
excessive wear or stretch. Failure to comply
may cause serious injury.
1. Test the hoist under load in both the lifting and
lowering directions, observing the operation of
chain and sprockets. Chain should feed
smoothly into and away from the sprockets.
2. If the chain binds, jumps, or is noisy, make sure
it is clean and properly lubricated. If the trouble
persists, inspect the chain and mating parts for
wear, distortion, or other damage.
3. Clean the chain before inspection. Examine for
gouges, nicks, weld splatter, corrosion, and
distorted links. Slacken the chain and move
adjacent links to one side, looking for wear at
the contact points. If you see wear or suspect
stretching, measure the chain as follows:
• Select an unworn, unstretched length of
chain (i.e. at the slack end).
• Suspend the chain vertically under tension
and, using a caliper type gauge, measure
the outside length of several links about 12
to 24 inches.
• Measure the same number of links in used
sections and calculate the percentage of
the increase in length.
4. If the length of used chain exceeds 2-1/2
percent of the unused chain, replace the chain.
(See “Load Limits” on page 13 for specific link
measurements.)
Do not add to the load chain.
Replace the entire chain. Failure to comply may
cause serious injury.
7.2 Load Chain Removal (all models)
Remove the old load chain as follows while
referring to Figure 11:
1. Remove the cotter pin (A) and the chain anchor
pin (C) on the chain anchor (D), allowing the
end of the chain to fall free.
2. Pull the hand chain (Fig. 5) until the load chain
is completely removed from the gear assembly.
7.3 Attaching Load Chain to Load Chain
Sprocket (all models)
Install the new load chain onto the load chain
sprocket as follows, referring to Figure 10:
1. Position the hoist body upside down, so that
the outlets for the load chain are showing.
2. Insert the load chain (B) into outlet (C) until
resistance from the sprocket grooves is felt, so
that the chain will wind up and back over the
sprocket. Welds in the chain must face away
from the sprocket. Make sure the first link
inserted is parallel to the side plates.
3. Rotate the hand chain wheel clockwise in the
“lift”/U direction, or pull the hand chain in the
same direction, so that the load chain falls into
the sprockets and comes out from the outlet
(D). If the load chain does not engage, rotate
the hand chain wheel counterclockwise in the
“lower”/D direction and perform the operation
again. The load sprocket is not visible from the
outlets and the load chain cannot be guided
into it, so several attempts may be required
before the load chain engages.
Figure 10
Referring to Figure 11:
4. Insert one end of the chain link (B) into the
chain anchor (D).
5. Insert the chain anchor pin (C) through the
chain anchor (D) and chain link (B) and secure
with the cotter pin (A).
Figure 11