CM Lodestar A, Operating, Maintenance & Parts Manual

Page: 16 / 128

16
00001996 (REV AC) 627NH October 2014
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.
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.
Do not allow the hook block to contact the bottom of the
hoist or the loose end chain to become taut.
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 equipped with a chain container/
bag, reset the upper and lower limit switches as
indicated on page 23.
Under no condition should the hook block or load
be permitted to come in contact with the chain
container/bag. If contact is made, the function of
the chain container can be interfered with and its
fasterners imperiled.
NOTE: When chain bag is fi lled to capacity the bag
must be no more than 75% fi lled.
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 fl oor, a “control cord alteration kit” (Part Number
28642) can be obtained from CM for shortening the length of
the control cord.
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 INJURY:
Shorten the control cord using the control cord alteration kit
and the instructions provided with the kit.
OPERATING INSTRUCTIONS
GENERAL
1. The Load-limiter is designed to slip on an excessive
overload. 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.
It 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
predetermined 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 defi nite
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 identifi cation
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.