Belt Tensioning - Schneider Airsystems AirMaster AM 11-8 E1 Notice D'utilisation D'origine

25 BELT TENSIONING

The belts tension is guaranteed by the horizontal sliding of the air-end/pulley bracket (fig.1 n°3) after having
loosened the screws (fig.1 n°4). The correct tensioning is operated by adjusting the position of this bracket with the
regulation screw (fig.1 n°1). In order to check the correct belt tension value, apply a F Force=90±5 N with a
dynamometer, positioned in the middle of the belts (see fig.2), if the tension is correct the measure of the camber is
f= 7±0,2 mm.
If f>7,2 mm the tension is too low and the regulation screws must be screwed then the measure of f should be done
again to verify if the correct value is reached.
If f<6,8mm the tension is too high and the regulation screws must be unscrewed then the measure of f should be
done again to verify if the correct value is reached.
NOTE 1: Once the belt has been replaced and the belt tensioned following the procedures just described,
the compressor should run for 20-30 min. Check the tension by measuring the "f" value, should this not be
within the standard range tension, the belt should be tensioned again.
NOTE 2: Check the perfect alignment of the pulleys and if necessary correct it to set the misalignment to
1,5 mm ( fig.1 )
TOOL FOR
ALIGNMENT
CONTROL
Fig. 2
1 - TENSIONING SCREW
2 - BLOCKING NUT
3 - SLIDING PLATE
4 - SLIDING PLATE SCREWS
5 - AIR-END PULLEY
6 - MOTOR PULLEY
7 - AIR-END SUPPORT
8 - ELECTRIC MOTOR
9 - AIR-END
10 - BELT
Fig. 1
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