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9-11
FORKS
2)
Problem
Cause
Remedy
Abrasion
Long-time operations causes the fork to
wear and reduces the thickness of the
fork.
Inspection for thickness is needed.
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Wear limit : Must be 90% of fork
thickness
If the measured value is below the
wear limit, replace fork.
Distortion
Forks are bent out of shape by a
number of reasons such as overloading,
glancing blows against walls and
objects, and picking up load unevenly.
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Difference in fork tip height
If the measured value exceeds the
allowance, replace fork.
Fatigue
Fatigue failure may result from the
fatigue crack even though the stress to
fork is below the static strength of the
fork. Therefore, a daily inspection
should be done.
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Crack on the fork heel.
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Crack on the fork weldments.
Repair fork by expert.
In case of excessive distortion,
replace fork.
Fork length
(mm)
Height
difference (mm)
equal or below 1500
3
above 1500
6