17
the small end of the pin. The small end of the pin is the end
opposite the end on which the three grooves are visible.
Place the hook block in the V-Block and drive the pin out
using the drift and a hammer or slow acting press.
To re-install the pin, the parts must be arranged the same as
they were when the pin was removed. To do this, use the
small end of the pin as a gage. First check the holes in the
hook block body and determine which hole is the largest.
Place the hook block body in the V-Block with the larger hole
on top. Next, check each end of the hole in the lower hook
chain block (624-775) and determine which end is the
largest. Place the chain in the slot of the chain and insert the
chain block, with the large hole on top, into the hook block
body. Align the holes in the hook block body with the hole in
the chain block and insert the small end of the pin in the
hole. Push the pin in by hand until it stops and then use a
hammer or slow acting press to drive the pin into position so
that the end of the pin is flush with the outside surface of the
hook block body.
REMOVAL AND INSTALLATION OF
LOAD CHAIN
Use only CM Star (
+
) Grade Load Chain and CM replacement parts. Use of
other chain and parts may be dangerous and voids factory warranty.
V
!!
WARNING
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.
V
!!
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.
V
!!
WARNING
Use of improper lower hook chain block pin as well as improper
installation of this pin can cause the pin to break and allow the
load to fall.
TO AVOID iNJURY AND PROPERTY DAMAGE:
Use only CM supplied, special high strength lower hook chain
block pin to attach the chain to the lower hook block and
install the pin as directed above.
1. Disconnect hoist from power supply.
2. Detach loose end chain from hoist frame. Remove loose
end block and stop block from the old load chain.
3. Using the following procedures (cutting chains) cut a por-
tion out of the second to last link (flat link) on the loose
side of the old chain to form a coupling link. The portion
removed should be centered on the weld and be 3/8"
long. Remove any burrs from the cut edges of the cou-
pling link. Discard the last link.
4. Connect the new chain to the old chain using the coupling
link. The coupling link should be a flat link and the first link
of the new chain should be an upstanding link. Be sure the
welds on the upstanding links are away from the liftwheel.
5. Re-energize power supply and operate hoist in the down
direction until approximately two and one-half (2-1/2') feet
of the new chain is hanging free on the loose end side.
Make sure that the last link of the new chain is an upstand-
ing link. Slide the stop block onto the new chain and attach
the loose end block to the chain using the load chain pin.
Next, attach the loose-end chain to the hoist frame using
the loose-end screw washer and plain washer.
Note: If hoist is equipped with a chain container, do
not attach the loose end chain to the hoist frame.
6. On single reeved units, remove the lower hook block from
the old chain and remove the coupling link. Reassemble
the hook block to the last link of the new chain. (See
above-lower hook block pin.)
On double reeved units, pull the new chain through the
hook block using the old chain and coupling link. Be sure
there are no twists in the chain and the first link of the new
chain is a flat link.
NOTE: Upstanding links in the hook block will
have weld towards the sheave.
Remove the coupling link and remove the old chain from
the dead end block at the hoist. Run the new chain up to
the dead end block making sure there is no twist in the
chain between the hook block and dead end block.
Attach the last link (flat link) of the new chain to the dead
end block.
If the hoist is completely disassembled when the new chin is
to be installed, the new chain should be placed over the lift-
wheel (with weld on upstanding links away from liftwheel).
Leave 2-1/2' of chain hanging free on the loose end side.
Refer to steps 5 and 6 above to complete the installation.
Note: On the double chain units, it will be necessary
to use a length of soft wire to pull the new chain
through the hook block in lieu of using the coupling
link and old chain as indicated.
If the starter chain method is not used, the chain can be
installed by partially disassembling the hoist. Remove the
loose-end chain, loose-end block and stop block from the
chain. Then, energize the hoist to carefully run the old chain
out of the hoist. Disconnect the hoist from the power supply
and remove the electric brake assembly. Rotate the brake
hub by hand, at the same time feeding the new chain into
and through liftwheel area with the hoist upside down or using
a soft wire to pull the chain up onto the liftwheel. Be sure that
the weld on the upstanding link is away from the liftwheel.
Refer to steps 5 and 6 above to complete the installation.
NOTE: On the double reeved units, it will be neces-
sary to use a length of soft wire to pull the new
chain through the hook block in lieu of using the
coupling link and old chain as indicated.
