Allis-Chalmers HD-4 - Page 40

TRACK SAG ADJUSTMENT
To miniInize rnove:ment of the tractor" in its
blocking while in transit
l
the tracks are pur-
posely adjusted "TIGHT" at the factory. Be-
fore tmloading the tractor from its carrier, the
tracks must be adjusted. Loosen capscrews in
lock plate and tUrn the adjusting screw into the
track release yoke as necessary to obtain I-I/zl'
sag between the track support roller and the front
track idler. A 15
11
cresent V?rench Ulay be used to
adjust tracks.. Tighten caps crews in the adjusting
screw lock plate.
All future track adjustments should be made in
the follo'Wing manner and with a reasonable clean
track..
Run the tractor backward and forward a few times
before checking the sag measurement of track.
The last movement of the tractor must always be
forward. Do not apply brakes. Let unit roll to
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a stop. The track sag measure:::nent is to he made
with a grouser pin directly over the centerline
of the track support roller.
Place a straight edge on top of the track and
measure the sag from the straight edge to the
grouser S ITIidway between the front idler and the
track support roller. The track is correctly
adjustFd when the sag is 1-1/2" to 2-1/2". If the
track sag exceeds 2-1/2", readjust the sag to
1-1/2". Proper adjustment is important because
rapid wear of tracks and other affected parts will
occur if the tracks are too tight or too loose.
To adjust each track, loosen caps crews in lock
plate and turn the adjusting screw out of the
track release yok.e as necessary to force the track
idler ahead until the proper sag of 1_1/2rr is ob-
tained. wnen the correct adjustment of the track
is obtained, tighten the caps crews in the adjusting
screw lock plate~