Harrington Hoists and Cranes (N)ER Hoist - ((N)ER1) - Manual (Page 33)

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6.3.5 Motor Brake Unit Installation - After the brake is properly adjusted and inspected, carefully replace the
motor brake unit back into the hoist. Be sure to reseal the Motor Cover to motor frame surface using a
small bead of liquid (hi-temperature) sealant. Refer to
Section 6.3.2 and reassemble the parts in
reverse order of removal.
6.4 Load Chain
6.4.1 Lubrication and Cleaning – refer to Section 6.2.
6.4.2 Load Chain Replacement:
1)
CAUTION
The hoist must be properly powered and operational in order to perform the
following procedures.
2)
WARNING
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 odd number of
links so that both its end links have the same orientation. If the load chain is being replaced due to
damage or wear out, destroy the old chain to prevent its reuse.
3)
CAUTION
When replacing load chain, check for wear on mating parts, i.e. Load Sheave,
Chain Guides and Idle Sheaves, and replace parts if necessary.
4)
Remove all chain components including the Bottom Hook Set Assembly, Stoppers, Cushion Rubbers,
Chain Springs, Striker Plates, Chain Pin and End Wire (or End Suspender) from the chain for reuse on
new chain. Inspect and replace any damaged or worn parts.
5)
Using a C-link, attach the new chain to the end link of the old chain on the no-load side. The end link of
the new load chain should be connected so that the welded portions of the load chain's standing links
are oriented to the outside as they pass over the sheave. Refer to
Figure 6-4 .
6)
Operate the hoist down to move the chain though the hoist body. Stop when a sufficient amount of
new chain is accumulated on the load side.
7)
Single fall hoists - Attach the chain components (step 4 above) to the chain. Refer to Section 3.2 for
the proper locations.
8)
Double falls (030C, 050L) - Feed the end link on the load side of the new chain through the required
chain components (step 4 above) and the bottom hook’s Idle Sheave. Attach the remaining chain
components to the chain referring to
Section 3.2 for the proper locations. Connect the end link to the
top connection yoke with the chain pin, slotted nut and cotter pin. Ensure that chain remains free of
twists. Refer to
Figures 3-6 and 3-7 .
9)
WARNING
Make sure Stoppers, Cushion Rubbers, Chain Springs and Striker Plates are
properly installed. Refer to Section 3.2.
10)
After installation has been completed, perform steps outlined in Section 3.6 "Preoperational Checks
and Trial Operation".
6.5 Friction Clutch and Mechanical Load Brake with Friction Clutch
6.5.1 Friction Clutch (NER Models) – If abnormal operation or slippage occurs do NOT attempt to
disassemble or adjust the Friction Clutch. Replace the worn or malfunctioning Friction Clutch as an
assembly with a new, factory adjusted part.
6.5.2 Mechanical Load Brake with Friction Clutch (ER Models) – If abnormal operation or slippage occurs do
NOT attempt to disassemble or adjust the Mechanical Load Brake with Friction Clutch. Replace the
worn or malfunctioning Mechanical Load Brake with Friction Clutch as an assembly with a new, factory
adjusted part.