Checking the load hook

 

Checking for ease of movement

 

Load hook crosshead

Load hook

 

*   Rotate the load hook to the left and right.

The load hook must be easy to move and freely rotatable.

*   Slew the load hook backwards and forwards at the load hook crosshead.

The load hook crosshead must be freely slewable.

 

 

*   If the load hook is not easy to move or freely rotatable or slewable, it must be repaired.

ABUS Service will gladly provide assistance if needed. See ABUS Service.

 

 

Inspecting the bracket on the bottom block

Bracket

 

*   Inspect the brackets. They must not exhibit any cracking, deformation or other signs of damage.

 

 

*   If the brackets are deformed or damaged in any other way, they must be replaced.

 

 

Measuring deformation and wear of the load hook

*   Measure the distance 'y' between the two stamped markings.

*   Read the reference distance for 'y' from the test log book or from the load hook itself if appropriate.

The measured distance ‘y’ must not be greater than 1.1 times the reference distance ‘y’.

With ramshorn hooks, the distances ‘y1’ and ‘y2’ from the engraved marking on the tip of the load hook to the marking on the hook shank must each be measured and compared separately.

 

 

*   Measure the base height ‘f’ of the load hook.

*   Compare the measured value with the table.

The measured base height ‘f’ must not be smaller than given in the table. The table specifies the minimum base height.

Size of load hook

Type of load hook

Minimum base height “f” [mm]

1

Normal hook

38

1.6

Normal hook

45.6

2.5

Ramshorn hook

47.5

2.5

Normal hook

55.1

4

Ramshorn hook

57

4

Normal hook

63.7

*   If the load hook has been widened to a greater degree than is allowed or if the base height is below the permissible limit, replace the load hook.

Do not carry out any repair welding (e.g. build-up welding) on the load hook or on the load hook nut.

 

 

Edge at transition to adjacent area in bed of hook

Protruding burr

*   Check the wear surfaces in the bed of the hook. They must merge gradually with the surrounding surfaces. They must not have any sharp score marks and edges or other surface faults.

*   Inspect the edges. The side edges on the load hook should not have any exterior protruding burrs or similar surface faults.

*   If the wear surfaces or side edges do have sharp score marks or edges, these may be smoothed (e.g. filed). The limit values for base height given above must be observed even after smoothing.

 

 

Inspecting the load hook surface

*   Inspect the load hook surface. It must not have any faults, cracks or corrosion.

*   If the surface of the load hook is not OK to any extent whatsoever, disassemble the load hook and inspect the surface of the hook shank. It must not have any faults, cracks or corrosion.

 

 

Inspecting the anti-rotation device of the load hook nut

With load hooks with anti-rotation device through tensioner sleeve:

 

Load hook nut

Tensioner sleeve

 

*   Tilt the load hook until the anti-rotation device is clearly visible.

*   Inspect the anti-rotation device. The tensioner sleeve must be present, not damaged or broken, and it must sit securely.

*   If the tensioner sleeve is missing or damaged, it must be replaced.

 

 

For load hooks with anti-rotation device by means of locking plate:

 

Safety plate

 

Load hook nut

*   Tilt the load hook until the anti-rotation device is clearly visible.

*   Inspect the anti-rotation device. The locking plate must be present, undamaged and sit securely.

*   If the locking plate is missing or damaged, it must be replaced.

 

 

Inspecting the hook safety latch

Hook safety latch

 

*   Inspect the hook safety latch. It must be present, functional and easy to move, and must not be deformed or damaged in any other way.

*   If the hook safety latch is missing, damaged or not working properly, it must be replaced.