JLG X23J Operator Manual - Manual (Page 140)

BOOM LIFT MODELS X23J
JLG
136 X23JR0620113
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 remo‑
ve the tracks or disassemble the track‑tensioner cylinder because the grease pressure inside
the track is very dangerous.
7.11.3 C HECKING THE RUBBER TRACKS
The structure of the rubber track is illustrated in fig.A. The steel ropes and the metal core are
sunk into the rubber. The carved profiles are used to give stability when moving over loose
land. They are situated in the lower part resting on the ground, while the wheel guides situa‑
ted inside the track, prevent the track from escaping from the guide rollers.
Causes of damage
A) Breakage of the steel ropes
Excessive tension causes the steel ropes to break in the following conditions:
‑ when stones or foreign bodies accumulate between the track and the under‑carriage frame;
‑ when the track escapes from its guide;
‑ in the case of strong friction such as rapid direction changes.
B) Wear and breakage of the metal cores
As for breakage of the steel ropes, stated above, excessive tension may cause the metal cores
to bend or break, as may the following causes:
‑ incorrect contact between toothed wheel and track;
‑ breakage of internal rollers;
PERICOLO
Fig. A
CORDE
D'ACCIAIO
SCULTURA
LATO RUOTA
FORO RUOTA
DENTATA
ANIMA METALLICA
CARVED PROFILE
STEEL ROPES
METAL CORE
SPROKET
HOLE
WHEEL SIDE
DANGER