SECTION 3 - CHASSIS & TURNTABLE
3121774
3-1
SECTION 3. CHASSIS & TURNTABLE
3.1
RUBBER TRACK MAINTENANCE/REPLACEMENT
Checking Track Tension
Stop the machine on a flat and solid ground. Raise the
machine off the ground safely and, if needed, support it by
applying stable blocks or jack stands under the undercar-
riage frame. In correspondence with the undercarriage
central roller, measure distance “A” of the bottom of the
roller to the hard internal part of the rubber belt. Track
tension is normal if measure “A” is between 10 and 15 mm.
If the tension is not within the above measure, or too tight,
please follow the procedure illustrated in the following
paragraph.
Figure 3-1. Tensioning Check 1
As an alternative to the above-mentioned procedure, you
can follow the procedure below. In this case, the check is
less accurate and precise. However, effective for evaluat-
ing if the rubber track is too slack.
Stop the machine on a flat and solid ground. In correspon-
dence of the upper skid of the carriage, measure distance
of the bottom of the skid to the hard internal part of the
rubber belt, lifting the belt manually. The track tension is
normal if measure “A” is between 10 and 15 mm. If the ten-
sion is not within the above measure, or too tight, please
follow the procedure illustrated in the following para-
graph.
Figure 3-2. Tensioning Check 2
Tensioning Rubber Track
DANGER
THE GREASE CONTAINED IN THE HYDRAULIC TRACKS IS UNDER PRES-
SURE. IF THE VALVE TRACK TENSION IS TOO LOOSE, IT COULD BE
EXPELLED UNDER THE EFFECT OF THE PRESSURE OF GREASE, SERI-
OUSLY ENDANGERING THE SAFETY OF THE OPERATOR.
WHEN GRAVEL OR MUD IS STUCK BETWEEN THE SPROCKET TEETH
AND TRACK LINKS, REMOVE IT BEFORE TIGHTENING THE TRACKS.
To tighten the tracks, connect a grease gun to grease fit-
ting 2 and add grease until the track tension reaches the
indicated values (preferably use a pneumatic pump with
100 bar operating pressure). Before start the machine
clean up any grease spillage.
Figure 3-3. Tensioning Valve
Removing Rubber Track
Stop the machine on a flat and solid ground. Raise the
machine off the ground safely and, if needed, support it by
applying stable blocks or jack stands under the undercar-
riage frame.
1.
To loosen the track, slowly unscrew grease
release valve (1) counterclockwise for no more
than a turn. If the grease does not start drain,
slowly rotate the track. If also in this case the
grease not emerges repeat the rotation of a lap
of the valve and then slowly rotate the track.
Repeat these steps until the grease begins to
drain by unscrewing the valve of not more than
one turn at a time.
Figure 3-4. Draining Valve
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