Superabrasive User Manual Original Language
Lavina
® 21-X
4/2015
18
8.5 MOUNTING AND TENSIONING A NEW PLANETARY BELT
Unscrew the two bolts and the nut of the tensioning device(Fig.
8.4.6)(Fig. 8.4.7)(Fig. 8.4.8). Unscrew the stop nut and turn the
tensioner to loosen the belt (Fig. 8.4.9). Take off the old belt. Put the
new belt (Fig. 8.5.1) and then screw the bolts and nut of the tensioning
device. Do not forget to lock the tensioning device (Fig.8.4.10).
ATTENTI
ON: NEVER “OVER” TENSION THE BELT, THE BELT
WILL BE DAMAGED AND IT WILL NEVER RECOVER ITS
ORIGINAL TENSION
8.6 TENSIONING AND REPLACING THE MAIN BELT
The transmission of the machine has one timing 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. Unscrew
the fixing bolts of the lower cover( Fig. 8.6.1) and
remove the bottom cover( Fig. 8.6.2). The change of all
seals together with the belt is recommended.
Fig.8.6.3 shows the scheme of belt location.
To dismount the main belt pos.1 unscrew the bolt on
pos.5, unscrew the three nuts on pos.2 and the nut on
pos.3 enough to be able to turn the tensioner pos.6
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 central 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.1 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 (Fig. 8.6.3-2) (Fig. 8.6.4), allowing the
rotation of the tensioners at minimum inclination.
Using nut on (Fig. 8.6.3-3) (Fig. 8.6.5) 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. 8.6.6). Tension in sp
an “А” of the belt should be 240-250Hz.
Figure 8.5.1
Figure 8.6.2
Figure 8.6.1
Figure 8.6.4
Figure 8.6.3
