JLG X17J Operator Manual - Manual (Page 123)

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 not normal if the track remains tight after valve 1 has been turned anticlockwise or if the
track is still loose after grease has been added to grease nipple 2.
Never try to remove the tracks or disassemble the track tensioner cylinder as the grease pres‑
sure inside the cylinder is very dangerous.
7.10.3 C HECKING THE RUBBER TRACKS
The structure of the rubber track is shown in Figure 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:
PERICOLO
Fig. A
CORDE
D'ACCIAIO
SCULTURA
LATO RUOTA
FORO RUOTA
DENTATA
ANIMA METALLICA
X17JR0420113
BOOM LIFT MODELS X17J
JLG
119
PATTERN
WHEEL SIDE
SPROCKET
HOLE
METAL CORE
STEEL WIRE
DANGER