JLG X17J Plus Operator Manual - Manual (Page 124)

PERICOLO
5. To tighten the track, connect a grease gun to grease nipple 2 and add grease until tension is
within the specified values.
It is anomalous if the track remains tightened after the valve 1 has been turned anticlockwise
or if the track is still loose after grease has been added to the greaser 2. In any case, do not
attempt to remove the tracks or to disassemble the track tensioner cylinder, as the pressure of
the grease inside the track tensioner cylinder is very dangerous.
7.11.3 CHECKING THE RUBBER TRACKS
The structure of the rubber track is illustrated in Fig. A. The steel wires and the metal core
are buried in the rubber. The pattern provides stability when moving over loose ground.
This is on the bottom of the track in contact with the ground, while the guides situated inside
the track prevent it from coming off the guide rollers.
Causes of damage
A) Breakage of the steel wires
Excessive tension causes the steel wires to break in the following conditions:
‑ when stones or foreign bodies accumulate between the track and the undercarriage chassis;
‑ when the track comes off the guides;
‑ in the event of strong friction, for example in case of abrupt changes in direction.
B) Wear and breakage of the metal cores
As for breakage of the steel wires, described above, excessive tension may cause the metal
cores to bend or break, as may the following causes:
X17JPR0020413 120
BOOM LIFT MODELS X17JPLUS
JLG
DANGER
Fig. A
CORDE
D'ACCIAIO
SCULTURA
LATO RUOTA
FORO RUOTA
DENTATA
ANIMA METALLICA
CARVED PROFILE
STEEL ROPES
METAL CORE
SPROKET
HOLE
WHEEL SIDE