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Capstan Hoist Operating Instructions
Before Hoisting (cont.)
2. NEVER exceed the capacity of any component of the hoisting system, including rope, blocks,
and rigging.
ALWAYS check the weight rating for single blocks. Single blocks will be subject to greater forces.
As an example, if a single block is used to lift a load weighing 400 pounds; it must be rated for a
minimum of 880 pounds.
Why? The 400 pound load is pulling down on the block from one side. At the same time the hoist
has to pull 400 pound from the other side to lift the load.
The 400 pound load plus the 400 pound pull from the hoist equals an 800 pounds downward load
on the block.
Friction will also add additional load on the block. A rule of thumb for friction is ten percent (10%) of
the load, so this would be an additional 80 pounds. The block in this example would need to have a
capacity of over 880 pounds.
3. ALWAYS use the right equipment for your situation.
Confirm the adequacy of the rated capacity for the hoist, rope, blocks, and rigging before use.
Inspect all load components for damage prior to use and replace or repair all damaged components.
Never overload the hoist.
Unlike a block and tackle, when operating a capstan, the operator can’t “feel” the weight. This makes
lifting loads nearly effortless on the operator. Because of this, the operator must know what the
weight of the object or the force to pull the cable will be before starting the job.
4. ONLY the operator should handle the rope and operate the foot control.
5. ONLY competent and properly trained employees should operate the hoist.
As with any piece of equipment, safe and effective operation depends on the proper training of
personnel. Each operator should be properly trained by their employer regarding their policies and
procedures for hoisting, including proper rigging procedures for the loads and to stop operation
immediately and secure the load in the event of a safety related issue.
To prevent SERIOUS INJURY or DEATH: NEVER exceed the capacity of any component of the
hoisting system, including rope, blocks, and rigging. The lowest capacity rating of any component
of the lifting system is the MAXIMUM capacity for that system.
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WARNING
