Harrington Hoists and Cranes AHM Hoist - Manual (Page 37)

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7.2 Load Chain
7.2.1 Lubrication and Cleaning
 Clean the chain with an acid-free cleaning solution. The load chain should be kept clean and
lubricated.
 Lubrication - Clean and lubricate the load chain per Section 6.0 at least once every 3 months for
normal usage. Clean and lubricate more frequently for heavier usage or severe conditions.
7.2.2 Replacement
1)

An air supply line must be connected to the hoist in order to perform the
following procedures.
2)

Be certain that the replacement chain is obtained from Harrington and is the
exact size, grade and construction as the original chain. The new load chain must have an even
number of links so that the end links are oriented 90° from each other.
3)
Remove the Bottom Hook Complete Set and Button Head Screw connecting the no-load end of
the chain to the hoist body. Keep the Bottom Hook Complete Set and Button Head Screw for
reuse on new chain. Carefully operate the hoist in the down direction to remove old chain.
4)

When replacing load chain, check for wear on mating parts, i.e. Load Sheave,
Chain Guides, Bottom Hook Complete Set and replace parts if necessary. If the load chain is
being replaced due to damage or wear out, destroy the old chain to prevent its reuse.
5)

Invert the hoist such that the chain separator openings are facing up and tilt
the hoist approximately 30° as shown in Figure 7-2. Insert the chain into the chain separator on the
no-load side opening making certain that the first link is a standing link and that its weld is facing
away from the centerline of the hoist.
6)

Operate the hoist as slowly as possible in the down direction to catch the Load
Chain and pull it through the hoist. Make sure the chain feeds smoothly while operating the hoist.
If binding occurs, stop and reverse the hoist direction to the back the chain out. Reinsert the chain
again while gradually operating hoist controls. Continue until a sufficient quantity of Chain is fed
through the hoist to attach the Bottom Hook Complete Set.
7) Ensure that of the Chain remains free of twists and attach the no-load end of the chain to the hoist
body with the Flat Washer and Button Head Screw. Reinstall the Bottom Hook Complete Set.
Torque the Button Head Screw to 26 in-lbs (2.9 Nm). and the Bottom Hook’s Socket Bolts to 95 in-
lbs (10.7 Nm). Refer to Figure 7-3.
8) After installation has been completed, perform steps outlined in Section 3.14 “Pre-operational
Checks and Trial Operation".