Maintenance Section
-170-
5. Check the fork blade (J) and shank (H) for wear with
special attention to the heel (G). The fork should be
withdrawn from service if the thickness is reduced to
90 percent or less of the original thickness.
Fork blade length may also be reduced by wear,
especially on tapered forks and platens. Remove the
forks from service when the blade length is no longer
adequate for the intended loads.
6. Check the fork mountings (K) for wear, crushing and
other local deformation, which can cause excessive
side to side wobble of the forks. Excessive clearance
on hook type forks may allow them to fall from the
carrier. Forks which show visible signs of such
damage should be removed from service.
7. Check the positioning lock and other fork retention
devices to make sure they are in place and working.
Hook type forks use a spring loaded pin (M), located
in the top hook, to engage notches in the top carriage
bar to hold the fork in place.
When adjusting the fork spacing, the forks are
prevented from sliding off the end of the carriage by
stop blocks. These stop blocks are at both ends of
the carriage and in the path of the bottom fork hook.
The load backrest extension may be used in place
of the stop blocks in some cases.
Shaft mounted forks may use set collars or spacers
on the shaft to either side of the fork. They may also
use U bolts, pins, or similar devices which engage
the fork through the top structure of the carriage.
8. Check fork markings (N) for legibility. Renew
markings as required to retain legibility.
a. Lift the mast and operate the tilt control lever, until
the top surface of the forks is parallel with the floor.
Place two straight bars that are the same width
as the carriage, across the forks as shown.
b. Measure the distance from the bottom of each
end of the two bars to the floor. The forks must
be parallel within 3 mm (.12 in) for Full
Tapered and Polished (FTP) forks, all other
forks 6.4 mm (.25 in), for their complete length.
c. Put one fork, one third from the tip, under a
fixture that will not move. Then operate the tilt
control with caution until the rear of the truck
lifts just off the floor. Follow the same
procedure with the second fork. Repeat Step
a.
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