Hooks; General - R&M LM Installation And Maintenance Manual

LM10 I&M MANUAL/EN/11.30.2010

7.10 Hooks

7.10.1 General

Check hooks for deformation or cracks. Hooks must be replaced if throat opening has increased by more
than 15%, or if throat opening has more than 10-degree twist from plane of straight hook.
Figure 20. Measuring Hook Deformation
Due to many types and sizes of hooks that can be furnished and/or specified by the user / owner, it is
recommended that user / owner measure the actual throat opening of hook as originally furnished. See
Figure 20. Record the throat dimension on above sketch. Retain as a permanent record. This record can
then be used for determining when hook must be replaced due to deformation or excessive throat opening.
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CAUTION: Abuse or overloading of hoist is indicated when any hook is twisted or has a
throat opening in excess of normal. Other load bearing components SHALL be checked for
damage.
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CAUTION: Safety latches SHALL be replaced if missing, bent, or broken.
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CAUTION: A safety latch SHALL function properly at all times.
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CAUTION: Repairing hooks by welding or reshaping is strictly forbidden.
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