NK clamp inspection procedure
Find on clamp: serial number, type and manufacturing year.
Clamps over 10 years old must be replaced.
NK
Inspection of clamp before use
FUNCTIONING
Return to authorized Tractel
®
repair center is necessary in case of
malfunction during any of the following tests:
Hang the clamp. Operate the clamp opening lever downwards without
bringing it at full stroke (without triggering off the locking in the open
position) then release. The clamp should close up freely.
Operate the clamp opening lever downwards at full stroke, until the locking
in the open position is triggered. Then lower the clamp and bring it home
onto a plate: the clamp must close automatically when the plate enters in
contact with the back of the throat.
STRUCTURE CONDITION
Cam wear: the teeth must penetrate the surface of the load to be lifted.
Visual and tactile inspection: the teeth edge should be sharp.
The cam must
be replaced as soon as there appears to be a flattened tooth
(as reference,
see a tooth situated at the cam extremity and still intact).
Note: in some cases, the clamp only handles one plate thickness. Wear of
teeth is then concentrated on several teeth, the others being intact.
Inspection shall therefore always be carried out on the whole of the cam
teeth.
Deformation: the clamp structure must not be deformed.
Visual inspection. The clamp must be replaced, especially when any of
the following condition is not respected:
1. If the min grab of the clamp is 0: the cam should be in contact with
the limit stop, one right facing the other when the clamp is at rest.
2. No chain link is deformed.
3. Check that the clamp opening dimension (A) is less than the
following value:
Clamp
A max
Clamp
A max
Clamp
A max
in (mm)
in (mm)
in (mm)
NK1 0-20
1(23.0)
NK2 30-60
2.5(63.2)
NK3 80-120
4.9(124.2)
NK1 20-40
1.7(43.2)
NK2 60-90
3.7(93.2)
NK5 0-50
2.3(58.0)
NK1 40-60
2.5(62.8)
NK3 0-40
1.7(44.2)
NK5 50-100
4.2(108.0)
NK2 0-30
1.3(34.5)
NK3 40-80
3.3(84.2)
NK5 100-150
6.2(158.0)
Cam to be replaced:
flattened teeth
Acceptable cam
Opening lever
Cam stop
Type
Year - Serial number
Indexed cam
Contact cam-stop
Min/Max grab (mm)
A
Record the inspection results
Capacity
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