JLG 450AJ ANSI Service Manual - Manual (Page 99)

SECTION 2 - PROCEDURES
3120749 – JLG Lift – 2-81
Assuming Normal Wear
It is normal for the bushing to wear down to the bolt and
for the link hole to wear oblong till it is ready to break out
the end.
Adjustment
IMPROPER SLACK ADJUSTMENT COULD CAUSE TRACK PARTS
TO BREAK.
Place a straight edge long enough to reach from the idler
to the drive wheel on the tracks. Measure the maximum
amount of track sag from the high point of the track seg-
ment to the bottom of the straight edge. Properly adjusted
track will have approximately 1 to 2 inches (25 to 50 mm)
slack.
To adjust the slack measurement, move the bolts from the
first hole to the second to create less slack, or from the
second to the first to create more slack.
Table 2-6.Adjustment Chart
Move 1 Hole 2 Holes 3 Holes 4 Holes 5 Holes 6 Holes 7 Holes 8 Holes 9 Holes 10 Holes 11 Holes 12 Holes
Equals 0.81 in
(20.5 mm)
1.62 in
(41 mm)
2.43 in
(62 mm)
3.25 in
(82.5 mm)
4.06 in
(103 mm)
4.87 in
(124 mm)
5.68 in
(144 mm)
6.50 in
(165 mm)
7.31 in
(186 mm)
8.12 in
(206 mm)
8.93 in
(227 mm)
9.75 in
(248 mm)