39
REMOVAL AND INSTALLATION OF LOAD
CHAIN
USE ONLY CM 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, where as
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
12 or 13.
c) Detach loose end of load chain from hoist frame, see
Figure 7. Also, on single reeved models, detach the
lower hook block from the load chain (see pg. 24).
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 pre-
mature failure of the new chain. Parts can be easily
identified by referring to pages 27 thru 40.
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 7.
BE CERTAIN THERE IS NO TWIST
.
h) For single reeved models, attach the hook block to
load chain (see Page 23) and proceed to step K.
i) For double reeved models, run the hoist
ជ
(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 blook (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.
k) Adjust limit switches as describe in Table 6, page 12.
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.
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.
WARNING
USE OF COMMERICAL OR OTHER
MANUFACTURER’S CHAIN AND PARTS TO REPAIR CM
HOISTS MAY CAUSE LOAD LOSS.
TO AVOID INJURY:
Use only CM supplied replacement load chain and parts.
Chain and parts may look alike, but CM chain and parts are
made of specific material or processed to achieve specific
properties.
WARNING
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.
WARNING
Do not allow hook block to hit hoist or allow load
chain to become taut between loose end screw and
frame or else serious 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.
!
!
!
Summary of Contents for Entertainment-Lodestar B
Page 49: ...46 NOTES ...
Page 83: ......
