JLG 600SC_660SJC Service Manual - Manual (Page 168)

SECTION 6 - UNDERCARRIAGE
6-64 – JLG Lift – 3120898
Measuring Track Tension
1. Place a straight edge on the tracks. The straight
edge should be tong enough to reach from the idler
to the carrier roller.
2. Measure the maximum amount of sag in the track.
The sag is measured from the highest point of the
track grouser to the bottom of the edge. A track that
is properly adjusted will have a slack of 40 to 55 mm
(1 5/8 to 2 1/8 inch).
Tightening the Track
Wipe the fitting before you add grease.
1. Add grease through valve fitting (1) until the correct
track tension is reached.
2. Operate the machine back and forth in order to
equalize the pressure.
3. Check the amount of sag. Adjust the track, as
needed.
Loosening the Track
1. Loosen relief valve (2) Carefully until the track begins
to loosen. One turn should be the
maximum.
2. Tighten relief valve (2) to 34 N m (25 lb ft) when the
desired track tension is reached.
3. Operate the machine back and forth in order to
equalize the pressure.
4. Check the amount of sag. Adjust the track, as
needed.
If the correct adjustment cannot be achieved, Consult
your JLG Distributor.
Track Adjustment - Inspect
Check the track adjustment. Check the track for wear and
for excessive dirt buildup.
If the track appears to be too tight or too loose, see Oper-
ation and Maintenance Manual, "Track Adjustment-
Adjust".
6.16 UNDERCARRIAGE- CHECK
1. Check the carrier rollers, the track rollers, and the
idler wheels for possible leakage.
2. Check the surface of the track, the carrier rollers, the
track rollers, the idler wheels, the track shoes, and
the drive sprockets. Look for signs of wear and
loose mounting bolts.
3. Listen for any abnormal noises while you are moving
slowly in an open area.
4. If abnormal wear exists or abnormal noises or leaks
are found, consult your JLG Distributor.