Superabrasive Lavina 25LM-X, Руководство пользователя

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Superabrasive User Manual Original Language Lavina® 25LM-X / Lavina® 25LM-X-HV 1/2016
8.7 TENSIONING AND REPLACING THE BELTS
The transmission of the machine has two timing belts (main belt and
planetary belt) of maintenance free type. To change the main belt you
have to remove all holders and dismount their adaptors. Dismount the
sealing. Carefully check the friction surface (flanges of the lower cover
and the outside diameter of the adaptors). Decide if they are in good
condition (wear out, smoothness of surface) and whether they can
work until next inspection. Remove the bottom cover, unscrew the
bolts on the outskirt and the three bolts of the spacers ( Fig. 8.7.1).
Under the cover on the outskirt there is a sealer, and the spacers have
O-Rings. The change of all seals together with the belts is
recommended.
Fig.8.7.5 shows the scheme of belts location. To dismount the old
belts first dismount the planetary belt pos.1 and after that the main
belt pos.6.
To dismount the main belt pos.6 unscrew nuts on pos.4 and pos.5
enough to be able to turn the tensioners pos.3 around the central axle.
Clean the washers and space around, and check if all bearings of pulley
units or tensioners are in good condition (check for too much
clearance or rolling noise). Rotating the tensioner will allow the centre
distance to be reduced in such a way that the timing belt may be fitted without force. Installation with the use of force is NOT
permissible at any time as this can damage the high quality, low stretch tension cord and other components. This damage is often
not visible. Put the belts in pos.6 as per the scheme, and pay attention for their correct position in every pulley. Screw up until it
stops and loosen on the half moons the nuts on pos.4, allowing the rotation of the tensioners at minimum inclination.
Using nuts on pos.5 tighten the belt, verifying again the correct position of the belt, and the correct gearing in every pulley.
Rotate the gear while tensioning to allow regular tension distribution on the belt. Control
the tension using Frequency tension Tester (Optibelt 3 TT) (Fig. 8.7.3). Tension in span “А” of
the belt should be 120-130Hz. It is possible for tensioning while changing the belt to use pre-
installed support (Fig.8.7.5-2) (Fig.8.7.6) (only when its factory position is not changed), to
limit the turn of the tensioner when the required belt tension is done.
ATTENTION:NEVER “OVER” TENSION THE BELT, THE BELT WILL BE DESTROYED AND IT WILL
NEVER RECOVER ITS ORIGINAL TENSION
To dismount the planetary belt (Fig.8.7.5-1) unscrew the screw of the front washer (Fig.8.7.7) and the two screws of the conical
sleeve (Fig.8.7.8). Screw one screw in the free thread(Fig.9.7.9), to push the washer down (Fig.8.7.10); take the conical sleeve and
the belt (Fig.8.7.11). You can help with a flat screw driver if the sleeve is not going out easy. (Fig.8.7.12).
Figure 8.7.3
Figure 8.7.1 Figure 8.7.2
Figure 9.7.4
Figure 8.7.5
Figure 8.7.6
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