Hook Inspection

Load hooks on hoists in regular service should be visually inspected daily by the operator. If the hoistis used in multiple-shift operations, load hooks should be visually inspected by the operator at the start of each shift. When visual inspection indicates that a more detailed inspection is required, the followingare some recommended inspection procedures in addition to what is stated in the manual furnished by the manufacturer with the hoist. These procedures also would apply to scheduled frequent and periodic inspections.

img-hook-inspection

  • Measure hook throat opening from metal to metal of the hook as shown by dimension E in Figure 7 below. DO NOT measure from latch to metal. Hook must be replaced when throat opening measurement has increased 15% over the original throat opening dimension of a new hook. The manual furnished with some hoists will include original dimensions and replacement dimensions for throat openings of standard hooks specified for the hoist line. Some hook manufacturers provide gauge marks on hooks. To aid in measuring the throat opening, it is recommended the hoist owner/user make a gauge of the dimensions shown in the manual. This will allow quick measurement of the throat opening and immediate indication that hook replacement is required. If hook throat opening dimensions are not covered in the manual furnished with the hoist, the hook throat opening should be measured by the owner/user prior to installing the hoist. This will establish a reference point to use in future inspections for determination when the throat opening dimension has increased 15% requiring hook replacement. A gauge similar to the one discussed above is recommended. The gauge should have the throat opening dimension measured prior to installation, and a dimension 15% greater than the throat opening dimension measured prior to installation.
  • Measure hook depth at load bearing point (base, bowl, or saddle) of the hook as shown by dimension G in Figure 7 above. Hook must be replaced when wear at load bearing point is 10% of the original depth of the hook load bearing point. The manual furnished by the manufacturer with the hoist may include original dimensions and replacement dimensions for depth at load bearing point of standard hooks specified for the hoist line.
  • If hook depth at load bearing point dimensions are not covered in the manual furnished with the hoist, the hook depth at load bearing point should be measured by the owner/user prior to installing the hoist. This will establish a reference point to use in future inspections for determination when wear at the load bearing point has reached 10% requiring hook replacement.
  • A bend or twist of the hook exceeding 10° from the plane of the unbent hook requires replacement of the hook. Refer to Figure 7, page 36.
  • A hook latch, when required on the hoist, that is missing shall be replaced.
  • A hook latch, when required on the hoist, that is inoperative shall be repaired or replaced.
  • A hook with a hook latch that does not close the throat opening of the hook, and the hook opening does not exceed the requirements of item 1 on page 36, shall be removed from service or moused until the latch is replaced or repaired.
  • Hooks having damage from chemicals, corrosion, or deformation shall be repaired or replaced. Damage in the form of cracks, nicks, and gouges may be repaired by a designated person by grinding longitudinally, following the contour of the hook, provided no dimension of the hook is reduced by more than 10% of the original dimension of a new hook. If the repair reduces the dimension of the hook by more than 10% of the original dimension of a new hook, the hook shall be replaced.

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