13. Attach the bottom block on single-chained hoists using a
new load block screw (See Figure 23). On double-chained
hoists, 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 23). 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 Hoist
Refer to Figures 4 and 5.
1. DISCONNECT HOIST FROM POWER SUPPLY and move
hoist to a work table. Do not remove the electrical cover.
2. Lay the hoist on its side and remove the four screws that
attach the sheave housing to the gear housing
(See Figure 12, Ref. No. 2).
3. Carefully pull the sheave housing and motor assembly loose
from the gear housing.
4. Turn the two hoist sections at right angles and remove the
chain guide screws and the nearest chain guide (Ref. No. 1,
Figure 5).
5. Remove the two chain guide plate screws (Ref. No. 2) and
the nearest chain guide plate. Be careful not to lose the two
spacers that are between the chain guide plates.
NOTE: Inspect chain guides and load sheave for wear,
replace as needed.
6. Lay the new chain over the load sheave. Allow about 15" of
chain below the hoist on the slack end (See Figure 4). 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 dead end. Also be sure the load hook assembly (if
already attached to the chain) is toward the center of the hoist
or to your right as you face the load sheave.
7. Replace the chain guide plate and the chain guide. Grease
the splined shafts that project from both the housing and
the motor.
8. Place the motor coupling on the splined shaft and carefully
fit the two hoist sections together. Be sure the dead-end nut,
the top hook and the chain support (double-chained hoists
only) are all in place. On single-chained hoists, the hook
shank goes in the center hole; on double-chained hoists, it
goes in the off-center hole (See Figure 4). Be careful not to
pinch any of the wiring. Turn the hoist on its side and replace
the four screws and tighten securely.
9. Follow steps 11 through 14 in the previous section, CHAIN
REPLACEMENT WITH CHAIN IN HOIST, to complete the
chain replacement procedure.
LIMIT SWITCH ADJUSTMENT
IMPORTANT: Before placing hoist in operation, check the limit
switch adjustment. Limit switches are provided to protect the
hoist against damage resulting from overtravel or to allow setting
the hook travel within the factory-set limits of travel. The standard
limit switch is designed for lifts of 50 ft or less on single-chained
hoists and 25 ft or less on the 2 ton, double-chained models. The
long lift limit switch allows for the maximum amount of lift, which
is 134 ft on 1/2 ton and under models, 143 ft on the 1 ton
models, and 71 ft on the 2 ton models.
The upper and lower limit switch adjusting nuts are color-coded
gold and silver respectively. Each limit nut has 10 slots for fine
adjustment, and the increment of adjustment is such that one
slot is equivalent to approximately one link of chain travel with
the standard limit switch. Movement of the limit switch nuts
toward or away from each other increases or decreases the
hook travel respectively.
Adjusting Upper Limit (Gold Nut)
Refer to Figure 3.
1. Suspend the hoist. For single chain models raise the load
block until there is a minimum clearance of 2" from the hoist
housing and the top of the block. Double chain models
require a minimum clearance of 1" from the chain support to
the top of the load block.
2. DISCONNECT HOIST FROM POWER SUPPLY and
remove the electrical cover.
3. With a screwdriver, pry the spring guide plate out of the slots
in the limit switch nuts.
4. Turn the slotted gold nut toward its limit switch until the
switch “clicks” then turn two slots farther. Release the spring
guide plate and be sure it slips back into the slots in both
limit switch nuts. Do not disturb the silver slotted nut if it has
been set previously.
8
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853
Figure 5 — Chain Replacement with No Chain in Hoist
1
2
There are wires running through the hoist. Carefully
ease the hoist sections apart. Do not jerk them apart.
Single-chained
Hoist
Double-chained
Hoist
Chain Support
Figure 4 — Chain Replacement Diagram
TON
TON
Dead-End
Screw
Slack End
Load End
