JLG 600SC_660SJC Service Manual - Manual (Page 90)

SECTION 4 - CAT CHASSIS (PRIOR TO S/N 0300128000)
4-28 – JLG Lift – 3121157
3. Place a straight edge on top of the track grousers
between the front carrier roller and the idler. The
straight edge should be long enough to reach from
the front carrier roller to the idler.
4. 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 straight edge. A
track that is properly adjusted will have a sag of 40.0
to 55.0 mm (1.57 to 2.17 inch).
5. If the track is too tight, or if the track is too loose,
adjust the track tension according to the appropriate
procedure below.
Adjusting Track Tension
The track adjuster is located on the track frame.
TIGHTENING THE TRACK
WIPE THE FITTING BEFORE YOU ADD GREASE.
1. Add grease through grease fitting (1) until the cor-
rect 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.
GREASE FITTING RELIEF VALVE