Fork - Inspect - Doosan GC15S-5 Operation & Maintenance Manual

Fork - Inspect

Forks should be inspected, at a minimum, every 12
months. If the truck is being used in a multi-shift or
heavy duty operation, they should be checked
every six months.
1. Inspect the forks carefully for cracks. Special
attention should be given to the heel section (A), all
weld areas and mounting brackets (B). Inspect the
top and bottom hooks on forks used on hook type
carriages and tubes on shaft mounted forks.
Forks with cracks should be removed from ser- vice.
"Wet Test" magnetic particle inspection is generally
preferred due to its sensitivity and the ease of inter-
preting the results. Portable equipment is usually
recommended so it can be moved to the lift truck.
Inspectors should be trained and qualified in
accordance with The American Society for Non
Destructive Testing, Level II Qualifications.
2. Check the angle between the upper face of the blade
and the front face of the shank. The fork should be
withdrawn from service if angle (C) exceeds 93
degrees or deviates by more than 3 degrees from an
original angle other than 90 degrees, as may be found
in some special application forks.
3. Check the straightness of the upper face of
blade (D) and the front face of shank (E) with a
straight edge.
The fork should be withdrawn from service if
the deviation from straightness exceeds 0.5
percent of the length of the blade and/or the
height of the shank respectively 5 mm/1000
mm (0.18"/36").
4. Check the difference in height of one fork tip to
the other when mounted on the fork carrier. A
difference in fork tip height can result in uneven
support of the load and cause problems with
entering loads.
The maximum recommended difference in fork
tip elevation (F) is 6.5 mm (0.25") for pallet
forks and 3 mm (0.125") for fully tapered forks.
The maximum allowable difference in fork tip
elevation between the two or more forks is 3
percent of blade length (L).
Replace one or both forks when the difference
in fork tip height exceeds the maximum
allowable difference.
DOOSAN Lift
information.
139
Maintenance section
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