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And finally, listen (while hoist operates) for unusual sounds which may indicate trouble.
Thorough Examination
The chain block must be subject to periodic thorough examination in compliance with
national statutory regulations including on initial use or following installation.
Reports of thorough examination can be based on statutory maximum intervals or via a
written examination scheme based on risks and hazards associated with use.
Any parts that are deemed unserviceable are to be replaced with new parts before the unit
is returned to service. It is very important that the unserviceable parts are destroyed to prevent
possible future use as a repair item and are properly disposed of.
The hooks and load chains are made of special alloy-steels and are precisely heat-treated.
Never weld or heat-treat them again.
Load Chain
Inspect the load chain for sufficient lubrication, mechanical damage and check for external
defects, deformations, superficial cracks, wear and corrosion marks.
Round steel section chains must be replaced when the original nominal thickness ´d´ on
the chain link with the worst wear has been reduced by more than 10% or when the chain has
elongated to a value greater than the discard levels shown in the tables below. There are two
alternative tables for either measuring the chain over 21 links or measuring the chain over 7
pitches. Chain should be clean, free of twists and pulled taut before measuring.
Measuring the diameter of the chain
CHAIN AND HOOKS
Replace the chain if d
normal diameter of the chain wire.
≤ 0.9 × d, where d is the
m
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