JLG X20JP - X600AJ Service Manual - Manual (Page 25)

SECTION 3 - CHASSIS & TURNTABLE
3121623 – JLG Lift – 3-1
SECTION 3. CHASSIS & TURNTABLE
3.1 RUBBER TRACK MAINTENANCE
Checking track tension
Stop the machine on firm, level surface. Lift the machine into
safe conditions and place stable supports under the under-
carriage frame for total support. Parallel with the central
roller of the under-carriage, measure distance (A) from the
bottom of the roller to the rigid inside of the rubber belt.
Track tension is normal if measurement (A) is between 10
and 15 mm.
If track tension is not within the measurements specified
above, loose or too taught, follow the procedures illustrated
in the paragraph below.
Figure 3-1.
Operations for loosening/tightening the
track
The grease contained in the hydraulic track is pressurised.
For this reason, do not loosen the greasing valve (1) by
more than 1 turn; if the valve is loosened too much, it risks
being expelled under the effect of the pressure of the
grease, putting the safety of the operator at risk. Never
loosen greaser (2).
When gravel or mud are blocked between the toothed wheel
and the track links, remove it before loosening.
1. Remove the screws and take of adjustment access
lid 3.
2. To loosen the track, slowly unscrew valve 1 in an
anti-clockwise direction for no more than one turn.
One turn of valve 1 is sufficient to loosen the track.
3. If the grease does not start to drain, turn the track
slowly.
4. When correct track tension has been obtained, turn
valve (1) in a clockwise direction and tighten it.
Clean all traces of grease.
Figure 3-2.
5. To tighten the track, connect a grease gun to
greaser (2) and add grease until belt tension is
within the specified values.
IT IS NOT NORMAL IF THE TRACK REMAINS
TAUGHT AFTER HAVING TURNED VALVE (1) IN AN
ANTI-CLOCKWISE DIRECTION OR IF THE TRACK IS
STILL LOOSE AFTER HAVING PUT GREASE INTO
GREASER (2). NEVER TRY TO REMOVE THE TRACKS
OR DISASSEMBLE THE TRACK-TENSIONED CYLIN-
DER BECAUSE THE GREASE PRESSURE INSIDE THE
TRACK IS VERY DANGEROUS.
A