Coffing Hoists Concert Series Operating, Maintenance & Parts Manual page 7

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.
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.
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.
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.
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.
For more information contact: Sievert Crane and Hoist, (708) 771-1600, parts@sievertelectric.com, www.sievertcrane.com
11. Attach the chain stop to the slack end of the new chain by
capturing the 12 th 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
Refer to Figure 3.
1. DISCONNECT LIFTING MOTOR FROM POWER SUPPLY
and move lifting motor to a work table. Do not remove the
electrical cover.
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.
2. Lay the lifting motor on its side and remove the four screws
that attach the sheave housing to the gear housing (See
Figure 10, Ref. No. 2).
3. Carefully pull the sheave housing and motor assembly loose
from the gear housing.
There are wires running through the lifting motor.
Carefully ease the lifting motor sections apart. Do not
jerk them apart.
4. Turn the two lifting motor sections at right angles and
remove the chain guide screws and the nearest chain guide
(Ref. No. 1, Figure 3).
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Figure 3 — Chain Replacement with No Chain in Lifting
Motor
7
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853
Suspension Hook
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