HOOKS
WARNING
1. Any hook that requires replacement because of excessive bends, twists, or throat opening indicates abuse or overloading of the
hoist. Therefore, other load-supporting components of the hoist should be inspected for possible damage when such conditions
are found.
2. Never repair hooks by welding or reshaping. Heat applied to the hook will alter the original heat treatment of the hook
material and reduce the strength of the hook.
3. Never weld handles or other attachments to the hook. Heat applied to the hook will alter the original heat treatment of the
hook material and reduce the strength of the hook.
HOOKS INSPECTION
Refers to ASME B30.10, Safety Standard for Hooks. Inspect hooks and measure hook throat opening at least once a month.
Between regular inspections check visually daily for deformation, distortion, twisting, damage, and missing or damaged hook
latches. Inspect as follows:
1. Measure hook throat opening from metal to metal of the hook as shown by dimension g in Figure 2. DO NOT measure from
latch to metal. Hook must be replaced when throat opening measurement has increased 5% over the original throat opening
dimension of a new hook, as follows:
CAPACITY
TONS
DIMENSION g
NEW HOOK
DIMENSION g
REPLACE HOOK
1/2 30mm 31.5mm
1 34mm 35.7mm
1-1/2 39mm 40.9mm
2 43mm 45.2mm
3 50mm 52.5mm
5 58mm 60.9mm
10 70mm 73.5mm
2. Measure hook depth at load bearing point (base, bowl or saddle) of the hook. Hook must be replaced when wear at load
bearing point is 10% of the original depth of the hook load bearing point.
3. A bend or twist of the hook exceeding 10
E from the plane of the unbent hook requries replacement of the hook.
4. A hook latch that is missing shall be replaced.
5. A hook latch that is inoperative shall be repaired or replaced.
6. A hook with a hook latch that does not close the throat opening of the hook shall be removed from service until the latch
is replaced or repaired.
7. Hooks having damage from chemicals, corrosion, or deformation shall be repaired or replaced.
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