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Figure 8
HOIST CAPACITY
TOP HOOK and BOTTOM HOOK
X-Normal
1/8 Ton
0.906 inch
1/4 Ton
0.906 inch
NOTE: Maximum permissible throat opening of hook with
latch fully retracted.
Figure 9
NOTE: Excessive hook throat opening or twist indicates abuse
or overloading of the hoist. If such deformation is discovered,
inspect hoist, chain, and all supporting members very carefully
for additional indications of excessive hoist loading.
Do not attempt repair of a hook by heat
treating, bending, or attaching anything by welding.
Such procedures will weaken and may cause failure of
the hook.
OPERATING THE HOIST
Before beginning a work shift, an
operator should test the pushbutton station, limit
switches and brake control. If not functioning properly,
they should be replaced or repaired before putting
hoist in service.
Allow the hoist to come to a full stop before changing
direction. Rapidly reversing or catching a falling load can
overload the hoist system and cause a failure in the hoist
and/or chain, resulting in injury or property damage.
If the hoist is connected to a manual trolley, move the hoist
by pushing on the suspended load. Move an unloaded hoist
by pulling on the empty hook. Do NOT move the hoist by
pulling on the pendant cord.
8
The brake mechanism must be kept clean and free from
dirt, water, and oil. Never allow oil to penetrate the brake
mechanism. Always keep your hoist clean, and store in a
clean, dry location.
Follow this general procedure for hoisting loads:
1.
Secure the upper hook to the supporting structure.
2.
Place load sling or chain in the centre of the bottom
hook, making sure the safety latch is secure.
Never load the hook in front of the safety latch.
See Figure 10.
X-Limit
1 inch
1 inch
3.
Avoid lifting one load with two hoists. If this is
unavoidable, apply equal weight to both hoists and use
hoists with the proper lift capacity. Capacity of each
hoist must be equal to the total load to be lifted.
4.
Press the UP button and remove all slack in load chain.
Increase tension in the load chain until the hoist is
about to raise the load.
5.
Check again that the load is properly slung, directly
under the hoist, and will not suddenly swing or twist.
6.
Raise the load an inch or two above the ground and
stop. Observe load for a few moments, looking for
signs that the load or hoist system is unstable, or other
indications that there is a problem.
7.
Check that the chain is not twisted at the bottom hook.
All welds should face the same direction (see Figure
14). For hoists with two or more falls of chain, make
sure the bottom hook is not turned over. This may
cause the chain to twist.
8.
Raise load to the travelling height. Raise only to the
height necessary to safely clear all obstacles.
9.
Lower load at destination. If both UP and DOWN
commands must be used during lowering, pause
for a moment between each reversal of load direction.
10. Slowly allow weight to shift from hoist to ground or new
support. Do not approach load until all tension is out of
chain and load is stable.
Figure 10
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