
CHECKING LIMIT SWITCH OPERATION IF HOIST IS
EQUIPPED
With hoists that are equipped with an adjustable screw limit
switch, the limit switch will automatically stop the hook at
any predetermined point when either hoisting or lowering.
Operate hoist over the entire length of its rated lift, checking
upper and lower limit switches for correct operation as follows:
1. Press (UP) control and raise the lower hook until
top of hook block is about one foot (305 mm) below
the hoist.
2. Cautiously continue raising the hook until the upper
limit switch stops the upward motion. The upper
limit switch is set at the factory to stop the hook
block 3 inches (76.2 mm) from bottom of the hoist
on all units with standard 10 foot (3m) lift except
Models AA and AA-2. Factory setting is 6 inches
(152.4 mm) for these models and for all other models
equipped with chain for lifts longer than 10 feet (3m).
3. If adjustment is necessary, see page 23.
4. Press (DOWN) control and cautiously lower hook
until lower limit switch stops the downward motion
From 7 to 11 chain links (depending on hoist model)
should be between the loose end link and the hoist
entry. See Figures 7 and 8.
5. If adjustment is necessary, see page 23.
NOTE: If the hoist is equippe with a chain
container/bag, reset the upper an lower limit
switches as in icate on page 23.
Un er no con ition shoul the hook block or loa
be permitte to come in contact with the chain
container/bag. If contact is ma e, the function of
the chain container can be interfere with an its
fasterners imperile .
NOTE: When chain bag is fille to capacity the
bag must be no more than 75% fille .
CONTROL CORD
Unless ordered on a special basis, the hoist is supplied with
a control cord that will position the control station approximately
4 feet above the lower hook when it is at the lower limit of the
lift. If this places the control station too close to the floor,
a “control cord alteration kit” (Part Number 28642) can be
obtained from CM for shortening the length of the control cord.
OPERATING INSTRUCTIONS
GENERAL
1. The Load-limiter is designed to slip on an excessive over-
load. An overload is indicated when the hoist will not raise the
load. Also, some clutching noise may be heard if the hoist is
loaded beyond rated capacity. Should this occur,
immediately release the (UP) control to stop the operation of
the hoist. At this point, the load should be reduced to the rated
hoist capacity or the hoist should be replaced with one of the
proper capacity. When the excessive load is removed, normal
hoist operation is automatically restored.
CAUTION: The Load-limiter is susceptible to overheating
and wear when slipped for extended periods. Under no
circumstance should the clutch be allowed to slip for
more than a few seconds.
Due to the above, a hoist equipped with a Load-limiter is not
recommended for use in any application where there is a
possibility of adding to an already suspended load to the
point of overload. This includes dumbwaiter (*see below)
installations, containers that are loaded in mid-air, etc.
(*) Refer to limitations on Page 3 concerning dumbwaiter
applications.
2. All hoists are equipped with an adjustable screw limit
switch, which automatically stops the hook at any pre-
determined point when either hoisting or lowering.
3. The control station used on two speed hoists is similar to
single speed unit, except that either of two definite
speeds may be selected by the operator in both hoisting
and lowering. Each control when partially depressed
provide SLOW speed and when fully depressed gives
FAST speed. Partial release of control returns hoist to
slow speed, while complete release allows hoist to stop.
Rated lifting speeds are shown on hoist identification
plate. SLOW speed is intended as a means of carefully
controlling or “spotting” the load, although the hoist may
be operated solely at this speed if desired. It is not
necessary to operate in the SLOW speed position as the
hoist will pick up a capacity load at FAST speed from a
standing start. In other words, it is not necessary to
hesitate at the slow position when moving control from
STOP to FAST position or vice versa.
4. If material being handled must be immersed in water,
pickling baths, any liquid, dusty or loose solids, use a
sling chain of ample length so that the hook is always
above the surface. Bearings in the hook block are
shielded only against ordinary atmospheric conditions.
HOIST
1. Before picking up a load, check to see that the hoist is
directly overhead.
2. WHEN APPLYING A LOAD, IT SHOULD BE DIRECTLY
UNDER HOIST OR TROLLEY. AVOID OFF CENTER
LOADING OF ANY KIND.
3. Take up a slack load chain carefully and start load easily
to avoid shock and jerking of hoist load chain. If there is
any evidence of overloading, immediately lower the load
and remove the excess load.
4. DO NOT allow the load to swing or twist while hoisting.
5. DO NOT allow the load to bear against the hook latch.
Allowing the hook block to run into the bottom of the hoist
when raising a load or allowing the chain to become taut
between the loose end screw and the frame when lowering
a load may break the chain and allow the load to drop.
TO AVOID IN URY:
Do not allow the hook block to contact the bottom of the
hoist or the loose end chain to become taut.
WARNING
!
Tying knots or loops to shorten the drop of the control station
will make the strain relief ineffective and the internal conductors
of the cord may break.
TO AVOID IN URY:
Shorten the control cord using the control cord alteration kit
and the instructions provided with the kit.
WARNING
!
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