17
P/N: 192047082 (REV AD) 627NH
March 2022
VARIABLE SPEED ELECTRIC CHAIN HOIST WITH
OPTION
Method #1
a. Disconnect hoist from power supply.
b. Detach loose end of load chain from hoist frame (see Figure 8).
Also, on single-reeved models, detach the lower hook block
from the load chain. On double-reeved models E, H, R, & RR,
unfasten the dead end side of load chain. On triple-reeved
Models R and RRT, detach the load chain from the lower hook
block.
c. Continue to disassemble the hoist and inspect the liftwheel,
chain guides, motor housing and gear housing which, if worn or
damaged, may cause premature failure of the new chain. Parts
can be easily identified by accessing the online Parts List (see
page 2).
d. If the liftwheel pockets, particularly the ends, are worn or
scored, replace liftwheel. If chain guides and housing are worn,
cracked or damaged, these parts should also be replaced.
e. Reassemble hoist with the new load chain inserted over the
liftwheel. Position chain with the weld on upstanding links away
from liftwheel and leave only one foot of chain hanging free on
loose end side. Make sure the last chain link is an upstanding
link. On double-reeved models, make sure the new load chain
has an even number of links. On triple-reeved models, make
sure the new chain has an odd number of links. This will
prevent twist in chain. To simplify handling when reassembling
the hoist, a short undamaged piece of the old chain may be
used as a “starter chain.” Position this piece of chain in exactly
the same manner as explained above for the “new chain” and
complete the reassembly of the hoist.
f. Attach the loose end link to chain and connect it to the hoist
frame with the loose end screw, washer and lock washer (see
Figure 8).
BE CERTAIN THERE IS NO TWIST.
NOTE: RRS USES CHAIN BLOCK ON LOOSE END. CHAIN IS
NOT SECURED TO THE HOIST.
CAUTION: For double-reeved models, be sure to disconnect one
of the loose end links from the load chain before attaching it to
the hoist.
g. For single-reeved models, attach the hook block to load chain
and proceed to step K.
h. For double-reeved models, run the hoist (UP) until only 3 feet
(0.9 m) in chain remains on dead end side. This will minimize
the chance of introducing a twist between hook block and
hoist. Allow the chain to hang free to remove twists.
i. Using a wire as a starter, insert the chain, flat link first, into
lower hook block (upstanding links will have weld toward
sheave) and pull through. Insert last link into slot in dead end
block, making certain that no twist exists in the reeving at any
point. Assemble dead end pin, washer and cotter pin as shown
in Figure 7.
j. Adjust limit switches as described in Table 10. If the new chain
is longer than the old, check to be sure limit switch will allow
for new length of lift. In the event maximum adjustment does
not allow entire length of lift, check with CM for modification, if
necessary.
k. For triple-reeved models, run the hoist (UP) until only 4 feet
(1.2 m) of chain remains on the dead end side. This will
minimize the chance of introducing a twist between the hook
block and hoist. Allow the chain to hang free to remove twists.
Using a wire as a starter, insert the chain, upstanding link first,
into lower hook block (upstanding links will have welds toward
sheave) and pull through. Using a wire as a starter, insert the
chain, upstanding link first, into the outboard cloverleaf of
the hanger. Make sure there are no twists between the hook
block and then pull the chain through. In the sheave hanger,
the upstanding links will have the welds toward the sheaves.
Run the chain down to the hook block and, making sure there
are no twists between the sheave hanger and the hook block,
insert the end of the chain into the recess in the top of the hook
block. Slide the dead end screw, with flat sides vertical, through
the hole in the top of the hook block. Place the lock washer and
nut on the threaded end of the dead end screw. Use an Allen
wrench to hold the head of the dead end screw stationary and
rotate the nut to tighten. To properly tighten the nut, apply a
torque of 45-55 lb-ft (61-74.6 N•m) while holding the head of
the dead end screw stationary. Also, when tightening the dead
end screw, hold it firmly in position and torque from the nut end
to avoid damaging the screw and/or chain.
Do not allow hook block to hit hoist or allow load chain to become
taut between loose end screw and frame. Serious damage will
result. If hook block should inadvertently hit the hoist, inspect the
hoist frames, load chain and hook block for damage before
further use.
Method #2
Treat the old load chain in hoist as a “starter chain” and proceed
with steps from Method #1, a, b, c and h through k. If a starter chain
is used, the loose end link (two links required for double-reeved
models) can serve as a temporary coupling link to connect the
starter chain in the hoist and the new load chain to be installed.
Then, under power, reeve the new load chain through the liftwheel
area, replacing the starter chain in unit. Run enough chain through to
attach loose end link to hoist frame.
Method #3
a. Proceed with Steps 1a, b & c from Method #1.
b. Then, carefully run the load chain out of the hoist.
c. Disconnect hoist from power supply.
d. Remove the electric brake assembly.
e. Rotate the brake hub by hand, at the same time feeding the
load chain into and through liftwheel area with hoist upside
down or using a wire to pull the load chain up onto the liftwheel
as explained in Method #1, step 1f.
f. Refer to Method #1 steps g through j above to complete
the installation.
NOTE: Check limit switch operation after installing load chain.
ORDERING INSTRUCTIONS
The following information must accompany all correspondence
orders for replacement parts:
1. Hoist model number from identification plate
2. Serial number of the hoist stamped below identification plate
3. Voltage, phase, hertz from the identification plate
4. Length of lift
5. Part number of part from online parts list (see page 2)
6. Number of parts required
7. Part name from online parts list (see page 2)
NOTE:
When ordering replacement parts, it is recommended that
consideration be given to the need for also ordering such items as
gaskets, screws and straps, etc. These items may be damaged
or lost during disassembly or just unfit for future use because of
deterioration from age or service.
