CM LODESTAR Manual De Funcionamiento, Mantenimiento Y Piezas página 51

ASSEMBLY INSTRUCTIONS (CONTINUED)
Use of commercial or other manufacturers' 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.
NOTE: When installing load chain in Models E, H, R, RR, E-2,
H-2, R-2 and RR-2 by either of the "starter chain" methods, two
loose end connecting links (627-743) must be used.
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, whereas Method 3 requires only partial
disassembly.
Method #1
1. Disconnect hoist from power supply.
2. Remove back frame cover and disengage the limit switch guide
plate from the traveling nuts, see page 16 or 17.
3. 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. On double reeved models E, H, R, RR,
E-2, H-2, R-2, and RR-2, unfasten the dead end side of the
load chain. On triple reeved Models RT, RRT, RT-2 and RRT-2,
detach the load chain from the lower hook block.
4. Continue to disassemble the hoist and inspect the liftwheel,
chain guides, motor housing and gear housing which if worn or
damaged could cause early failure of the new chain. Parts can
be easily identified by referring to pages 51 thru 85.
5. If the liftwheel pockets, in particular the ends, are worn or
scored excessively, replace the liftwheel. If chain guides and
housing are worn or cracked, these parts should be replaced.
6. 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 that the
new load chain has an even number of links. On triple reeved
models, make sure that 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.
7. 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 SURE THERE IS NO TWIST.
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 load chain before attaching
to hoist frame.
8. For single reeved models, attach the hook block to load chain.
9. For double reeved models, run the hoist p (UP) until only 3 feet
(.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. 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 sure
that no twist exists in the reeving at any point. Assemble dead
end pin, washer and cotter pin as shown in Figure 7.
10. For triple reeved models, run the hoist p(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 lockwasher 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 (61Nm) to 55
pound feet (74.6 Nm) while holding the head of the dead end
screw stationary.
Also, when tightening this dead end screw, it should be
held firmly in position and torqued from the nut end to avoid
damaging the screw and/or chain.
11. Adjust limit switches as described on pages 16 and 17. 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 necessary.
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 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 1a, b, c and f thru k above.
Method #3
1. First proceed with Steps 1a, b, c above.
2. Then, carefully run the load chain out of the hoist.
3. Disconnect hoist from power supply.
4. Remove the electric brake assembly.
5. Rotate the brake hub by hand, at the same time feeding the
load chain through the liftwheel area with hoist upside down
or by using a wire to pull the load chain up onto the liftwheel.
Position the chain on the liftwheel as explained in Step 1f.
6. Refer to Steps 1g thru k above to complete the installation.
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(ENGLISH)
P/N: 83874 (REV. 627-T) September 2016