MODE V6 - APPENDIX: INSPECTING THE HOOK OPENING; Measuring Wear on the Hook; 1 Visual checks; WARNING - Any hook that is twisted or has excessive throat opening...

7/2015
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APPENDIX: INSPECTING THE HOOK OPENING
Measuring Wear on the Hook
Wear on the suspension and lifting hooks should be checked regularly. Damaged safety
catches should be replaced immediately.
1
Visual checks
Hook surface should be free of significant rust, weld splatter, deep
nicks, or gouges.
Check for damage from chemicals, deformation or cracks or twisted
more than 10 degrees from the plane of the unbent hook, or
opening, allowing the hook latch to bypass hook tip.
WARNING
Any hook that is twisted or has excessive throat opening indicates
abuse or overloading of the hoist. Other load bearing components
of the hoist should be inspected for damage.。
1
Measure bottom hook opening (a2)
If the maximum dimension (a2) on the lifting hook is greater than
the initial dimension by more than 15 %, the hook should be
replaced.
Criteria:
Hook size
a2
max
[mm] (in)
012
25.3(0.996)
020
28.75(1.132)
04
34.5(1.358)
08
41.4(1.630)
2
Measure top hook opening (X)
If the maximum dimension (X) on the suspension hook is greater
than the initial dimension by more than 15 %，the hook should be
replaced.
Criteria:
Hook size
X
max
[mm] (in)
012
25.3(0.996)
020
28.75(1.132)
04
34.5(1.358)
08
41.4(1.630)
Note: The hook dimensions are nominal since they are not controlled to a
tolerance. The reference measurement of throat opening (a2) should be taken
when the hook is new.