Coffing Hoists Concert Series Operating, Maintenance & Parts Manual Download Page 7

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1. Check the chain for overall wear or stretch by selecting an

unworn, unstretched length of chain (at the slack end for
example). Let the chain hang vertically with a light load
(about 20 pounds) on the chain to pull it taut. Use a large
caliper to measure the outside length of a convenient
number of links (about 12"). Measure the same number of
links in a used section of chain and calculate the percentage
increase in length of the worn chain.

2. If the length of the worn chain is more than 1½% longer than

the unused chain (0.015" per inch of chain measured), then
the chain should be replaced. If the chain is worn less than
1½%, check it at several more places along its length. If any
section is worn more than 1½%, the chain should be replaced.

Chain Replacement with Chain in Lifting Motor

1. With the unit hanging by the suspension hook (decals

upside down), run the load hook to its “UP” limit.

2. DISCONNECT LIFTING MOTOR FROM POWER SUPPLY

and remove the electrical cover.

3. Using a screwdriver, pry the spring guide plate out of the

slots in the limit switch nuts (See Figure 5). Turn the gold
nut back to about the center of the threaded shaft. Do not
disconnect the wires from the limit switches.

4. Remove the load block assembly from the old chain. On

double-chained lifting motors detach the chain from the
chain support and pull it through the load block assembly.

5. Make a “C” shaped chain link by grinding through the end

link on the load end of the old chain.

6. Using the “C” link, attach the new chain to the load end of

the old chain. Be sure that the welds of the upstanding links
of the new chain will face outward from the load sheave.
The end links must be oriented for attachment to the
dead-end shackle and the chain support (double-chained
only) without any twist in the chain. Note that the chain end
is attached to the shackle with a split link.

7. With the electrical cover off, connect the lifting motor to the

power supply. Be sure that the green ground wire is
properly grounded (See INSTALLATION, page 4).

8. Carefully jog the “UP” button and run the joined pieces of

chain into the lifting motor until about 15" of the new chain
comes out the other side.

9. DISCONNECT LIFTING MOTOR FROM POWER SUPPLY.

10. Remove the “C” link and the old chain. Remove the chain

stop from the old chain by prying off its retaining ring with a
flathead screwdriver. If attached, remove the old chain from
the shackle on the side of the lifting motor by opening up
the split link.

11. Attach the chain stop to the slack end of the new chain by

capturing the 12

link with the two stop halves positioned

with their tapered ends pointing towards the lifting motor.
Slide the sleeve over the halves and attach the retaining
ring. If you are not using a chain container, attach the slack
end of the new chain to the shackle on the side of the unit
using the split link. DO NOT allow twists in the chain.

12. Adjust the lower limit switch (See ADJUSTING LOWER

LIMIT, page 8).

13. Attach the load block on single-chained lifting motors using

a new load block screw or pin (See Figure 19). On double-
chained lifting motors, feed the chain through the load block
(welds of the upstanding links will be in towards the
sheave) and fasten the end of the chain to the chain
support using a new chain support pin (See Figure 19).
Be sure there are no twists in the chain.

14. Adjust the upper limit switch (See ADJUSTING UPPER

LIMIT, page 8).

Chain Replacement with No Chain in Lifting
Motor

1. DISCONNECT LIFTING MOTOR FROM POWER SUPPLY

and move lifting motor to a work table. Remove the electrical
cover, electrical panel and the electric brake assembly.

2. Detach the chain stripper from the bottom of the lifting motor.

3. Insert the new chain between the load sheave and the chain

guide. Feed the chain into the lifting motor by manually
turning the brake hub. Allow about 15" of chain below the
lifting motor on the slack end. Be sure the welds of the
upstanding links are out away from the load sheave and that
proper orientation is observed for attachment of the slack
end. Also be sure the load hook assembly (if already
attached to the chain) is toward the center of the lifting motor
or to your right looking from the transmission end.

4. Reinstall the chain stripper observing proper chain

alignment and avoiding any twist in the chain.

There are wires running through the lifting motor.
Carefully ease the lifting motor sections apart. Do not
jerk them apart.

Failure to follow proper lockout/tagout procedures
may present the danger of electrical shock.

TO AVOID INJURY:

Disconnect power and lockout/tagout disconnecting
means before removing cover or servicing this
equipment.

Failure to follow proper lockout/tagout procedures may
present the danger of electrical shock.

TO AVOID INJURY:

Disconnect power and lockout/tagout disconnecting
means before removing cover or servicing this
equipment.

Failure to follow proper lockout/tagout procedures
may present the danger of electrical shock.

TO AVOID INJURY:

Disconnect power and lockout/tagout disconnecting
means before removing cover or servicing this
equipment.