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 rub-
ber 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 illus-
trated 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.
DANGER
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 CYLINDER BECAUSE THE GREASE PRESSURE INSIDE THE
TRACK IS VERY DANGEROUS.
A
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