Timberwolf TW 230VTR Manuel Opérateur page 64

SERVICE INSTRUCTIONS
CHECKING THE RUBBER TRACKS
The structure of the rubber track is shown in this diagram. The
steel cables (1) and metal core (2) are embedded in the rubber.
There are many ways in which rubber tracks may be damaged.
Some of these are terminal for the tracks, others are only
cosmetic.
Breakages of steel cables and metal cores
Excess track tension can cause steel cables to break. This may be
caused by:
• Stones or foreign matter accumulating between the track
and the undercarriage frame.
• The track slipping off its guide system.
• Extreme friction such as rapid changes in direction.
• Improper contact between track and sprocket.
• Operation on sandy terrain.
Fatigue cracks and abrasion
Cracks at the base of the carved profiles are caused by rubber fatigue due to bending.
Cracks and bends on the edge of the rubber are caused by manoeuvring the track on concrete edges and curbs.
Cracks and abrasions in the rubber on the guide roller paths are caused by compression fatigue of the rubber due to the
weight of the wheel combined with operation on sandy terrain or repeated sudden changes in direction.
Abrasion of the carved profile may be caused, in particular, by rotation on concrete or gravel surfaces or hard surfaces.
Cracks on the outside surface of the track are often due to contact with gravel, sharp stones and sharp materials such as
sheet metal, nails and glass.
Cracks on the inside surface of the circumference and on the edge of the rubber are caused by contact between track
and the undercarriage structure or with sharp concrete edges.
These methods of damage are progressive. The track can continue to be used until wear exposes the metal cores. If
this exposure extends for more than half of the circumference of the track then it is time to replace the track, even
though it can still be used.
CHECKING TRACK TENSION
1 Stop your machine on a flat and solid surface.
2 Measure from the ground to the inside edge of the
track at the top central location.
3 Pull the top of the track upwards and measure the
deflection.
4 The track tension is normal if the deflection is
betwen 30 ‐ 40mm.
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CARVED
PROFILE
1
3
26.06.2018
2
SPROCKET HOLE
2
30 ‐ 40mm
TW 230VTR
Rev: 2.0