35
O
O
P
P
E
E
R
R
A
A
T
T
I
I
O
O
N
N
A
A
N
N
D
D
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
M
M
A
A
N
N
U
U
A
A
L
L
TP2000
MUTP2000171893021216
‐ when the track comes off its guide;
‐ in the event of considerable friction, such as rapid changes in direction.
B)
Wear and breakage of the metal cores
As for the breakage of the steel wires described above, excessive tension may cause
the metal cores to bend or break, together with one of the following causes:
‐ improper contact between the cogwheel and the track;
‐ rotation of the inside rollers;
‐ operation on sandy ground.
C)
Separation of the metal cores
The metal core acts as the ʹadhesiveʹ for the rubber between the core itself and the
steel wires.
Separation may be caused by excessive tension,
as for the breakage of the wires, for the fol‐
lowing reasons:
‐ the metal cores have been rolled up by the
worn cogwheel as shown in the figure. When
such wear and abrasions are found, the
cogwheel must be replaced as soon as possible.
In the case of breakage as described in para‐
graphs A‐B‐C, the track must be replaced, as
this damage causes a complete loss of operabi‐
lity.
D)
Abrasion and cracks due to fatigue
1. Cracks at the base of the track patterns occur due to fatigue, since the rubber is
bent by the cogwheel and the idler roller, as shown in photo 4 (see the appen‐
dix).
2. Cracks and bends on the edge of the rubber are due to
the fact that the track is operated on curbs and sharp
concrete edges.
3.
Cracks and abrasion on the rubber along the line
of the guide rollers are due to fatigue from the compression of the rubber by the
weight of the wheel, together with operation on sandy ground, or repeated and
sudden changes in direction, as shown in photos 6‐8‐9 (see the appendix).
4. Abrasion of the track patterns may be caused by rotation on concrete, gravel or
PARTI USURATE
CRACK
W
ORN PARTS
