8-14 Lift Truck Maintenance
Uprights and lift chains require special attention to main-
tain them in safe operating condition.
• Uprights can drop suddenly. Look at the upright, but
keep hands out.
• Lift chain repairs and adjustments should be made by
trained service personnel.
Forks
Inspect the load forks for cracks, breaks, bending and wear. The fork
top surfaces should be level and even with each other. The height
difference between both fork tips should be no more than 1.5% of the
blade length.
If the fork blade heel is
worn down by more than
10 percents, the load
capacity is reduced and the
fork must be replaced.
Inspect the forks for twists
and bends. Put a 2" thick
metal block, at least 4" wide
by 24" long, on the blade of
the fork with the 4" surface
against the blade. Put a 24"
carpenter's square on the top
of the block and against the
shank. Check the fork 20"
above the blade to make sure
it is not bent more than 0.6"
(14.5 mm) maximum.
If the fork blades are obviously bent or damaged, have them
inspected by a trained maintenance person before operating the
truck.
Inspect the fork locating pins. Be sure they are not damaged or
broken and operate freely and lock correctly. Check the fork stop
pins for secure condition.
A
10% of "A" is
max. wear
1.5% is
max. height
difference
20"
Carpenter
Square
Blade
2" X 4"
50 cm
(20 in)
5 x 10 cm
(2 x 4 in)
Blade
Carpenter
square
14.5mm(0.6 in)
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