Superabrasive
User Manual Original Language
Lavina® 30GEB
1/2021
33
8.12 TENSIONING AND REPLACING THE BELTS
The transmission of the machine runs two timing belts (a main belt
that rotates the plates (and tools) and an auxiliary planetary belt
which propels the rotation of the head as a whole). To change the
main belt, remove all plate mounts (...Holders) and adapters. There
will be a seal to remove as well. Check any friction surfaces for
wear, and replace if necessary. To remove the bottom cover,
unscrew the bolts at the circumference of the cover, as well as
those in the spacers. We recommend that all seals (O-Rings in the
pacers and seal around the cover) be replaced when changing
belts.
Figure 8.11.5 shows the scheme of the belts. To remove the old
bels first remove the planetary belt (1) and then the main belt (6).
To remove the main belt (6), loosen nuts (4) and (5) enough to be
able to turn the tensioners (3) around the central axle. Clean the
washers and surrounding area, and check all bearings of pulley
units/tensioners for too much clearance or rolling noise. Rotating
the tensioner will allow the centre distance to be reduced in such
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. Arrange the belts in pos.6 as
per the scheme, paying attention to their orientation at every pulley. Loosen the nuts (5) to the end of the bolt, and fully loosen
the nuts on the half moon (4), allowing the rotation of the tensioners with minimal force.
Using nuts (5), tighten the belt, double checking the position/orientation of the belt and the gearing in each pulley.
Rotate the gear while tensioning to allow regular distribution of tension along the belt.
Measure the tension using a Frequency Tension Tester (Optibelt 3 TT) (Fig. 8.11.3).
Tension in span “А” of the belt should be 120-130Hz. It is possible to use the pre-installed
support (Fig. 8.11.5-2)(Fig. 8.11.6) as a reference to stop the tensioner at the desired belt
tension, provided that the supports have not been moved from their factory position.
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.8.11.5-1) unscrew the screw of the front washer (Fig.8.11.7) and the two screws of the
conical sleeve (Fig.8.11.8). Screw one screw in the free thread(Fig.8.11.9), to push the washer down (Fig.8.11.10); take the
conical sleeve and the belt (Fig.8.11.11).
Figure 8.11.3
Figure 8.11.1
Figure 8.11.2
Figure 9.7.4
Figure 8.11.5
Figure 8.11.6
