14
10001921 REV AC
July 2019
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.
REMOVAL AND INSTALLATION OF LOAD CHAIN
Improper installation (reeving) of the load chain can result
in a dropped load.
TO AVOID INJURY/DAMAGE:
• Verify use of proper size and type of hoist load chain
for specific hoist.
• Install load chain properly as indicated below.
USE ONLY CM EN (formerly DIN) OR STAR (
) GRADE LOAD
CHAIN AND CM REPLACEMENT PARTS. USE OF OTHER CHAIN
AND PARTS MAY BE DANGEROUS AND VOIDS FACTORY
WARRANTY.
Hoist load chain can be installed by any one of several methods.
The first method is recommended when replacing severely worn
load chain and requires disassembling the hoist. Method 2 does
not require hoist disassembly and is the recommended method
for initial installation of load chain. Method 3 requires only partial
disassembly.
Method #1
a. Disconnect hoist from power supply.
b. Remove back frame cover and disengage the limit switch
guide plate from the traveling nuts, see page 16 or 17.
c. Detach loose end of load chain from hoist frame, see Figure
3. Also, on single reeved models, detach the lower hook block
from the load chain. On double reeved models R & RR unfasten
the dead end side of load chain.
d. 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.
e. If the liftwheel pockets, in particular the ends, are worn or
scored, replace liftwheel. If chain guides and housing are worn,
cracked or damaged these parts should also be replaced.
f.
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. On double reeved models, make certain that
the new load chain is free of twists.
g. Attach the loose end link to chain and connect it to the hoist
frame with the loose end screw, washer and lockwasher, see
Figure 3. BE CERTAIN THERE IS NO TWIST.
h. For single reeved models, attach the hook block to load chain
and proceed to step K.
i.
For double reeved models, run the hoist (UP) until only 914.4
mm (36” Inches) of 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.
j.
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 3.
k.
Adjust limit switches as describe in Table 3, page 16. 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.
Do not allow hook block to hit hoist or allow load chain to
become taut between loose end screw and frame or else seri-
ous damage will result. If hook block should inadvertently hit
the hoist-the hoist frames, load chain and hook block should
be inspected 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 thru 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 together 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.
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.
Method #3
a. First 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 thru j above to complete
the installation.
