Doosan D20S-5 Operation & Maintenance Manual page 202

exceeds 93 degrees or deviates by more than 3 exceeds 93 degrees or deviates by more than 3
degrees from an original angle other than 90 degrees from an original angle other than 90
degrees, as may be found in some special degrees, as may be found in some special
application forks. application forks.
Maintenance Section Maintenance Section
5. 5. Check the fork blade (J) and shank (H) for wear Check the fork blade (J) and shank (H) for wear
with special attention to the heel (G). The fork with special attention to the heel (G). The fork
should be withdrawn from service if the should be withdrawn from service if the
thickness is reduced to 90 percent or less of the thickness is reduced to 90 percent or less of the
original thickness. original thickness.
Fork blade length may Fork blade length may also be reduced by wear,
especially on tapered forks and platens. especially on tapered forks and platens.
Remove the forks from service when the blade Remove the forks from service when the blade
length is no longer adequate for the intended length is no longer adequate for the intended
loads. loads.
6. 6. Check the fork moun Check the fork mountings (K) for wear, crushing
and other local deformation, which can cause and other local deformation, which can cause
excessive side to side wobble of the forks. excessive side to side wobble of the forks.
Excessive clearance on hook type forks may Excessive clearance on hook type forks may
allow them to fall from the carrier. Forks which allow them to fall from the carrier. Forks which
show visible signs of such damage should be show visible signs of such damage should be
removed from service. removed from service.
7. 7. Check the positioning lock and other fork Check the positioning lock and other fork
retention devices to make sure they are retention devices to make sure they are in place
and working. and working.
Hook type forks use a spring loaded pin (M), Hook type forks use a spring loaded pin (M),
located in the top hook, to engage notches in the located in the top hook, to engage notches in the
top carriage bar to hold the fork in place. top carriage bar to hold the fork
When adjusting the fork spacing, the forks are When adjusting the fork spacing, the forks are
also be reduced by wear,
tings (K) for wear, crushing
in place
in place.
-199- -199-
Shaft mounted forks may use set collars or spacers Shaft mounted forks may use set collars or spacers
on the shaft to either side of the fork. They may on the shaft to either side of the fork. They may
also use U bolts, pins, or similar devices which also use U bolts, pins, or similar devices which
engage the fork through the top structure of the engage the fork through the top structure of the
carriage. carriage.
8. 8. Check fork markings (N) for legibility. Renew Check fork markings (N) for legibility. Renew
markings as required to retain legibility. markings as required to r
9. 9. a. a. Lift the mast and operate Lift the mast and operate the tilt control lever,
until the top surface of the forks is parallel until the top surface of the forks is parallel
with the floor. Place two straight bars that are with the floor. Place two straight bars that are
the same width as the carriage, across the the same width as the carriage, across the
forks as shown. forks as shown.
b. b. Measure the distance from the bottom of Measure the distance from the bottom of
each end of the two bars to the floor. The each end of the two bars to the floor. The
forks must be parallel within 3 mm (.12 in) forks must be parallel within 3 mm (.12 in)
for Full Tapered and Polished (FTP) forks, for Full Tapered and Polished (FTP) forks,
all other forks 6.4 mm (.25 in), for their all other forks 6.4 mm (.25 in), for their
complete length. complete length.
c. c. Put one fork, one third from the tip, under a Put one fork, one third from the tip, under a
fixture that will not move. Then operate the fixture that will not move. Then operate the
tilt control with caution until the rear of the tilt control with caution until the rear of the
truck lifts just off the floor. Follow the same truck lifts just off the floor. Follow the same
procedure with the second fork. Repeat Step procedure with the second fork. Repeat Step
a. a.
etain legibility.
the tilt control lever,