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14.4 TENSIONING THE DRIVE BELT
The polymer grinder blade is driven by an air
motor via a smooth drive belt. A smooth belt is
used to allow the belt to slip if the blade contacts
a solid material.
The drive belt may become loose after an
extended period of time and may slip under
normal operation.
To check the belt tension, the top cover has to
be removed from the top of the polymer grinder.
To remove the top cover, first remove the
silencer cover from the rear of the grinder by
Shown: Polymer grinder top cover and belt
twisting anticlockwise by a few degrees then
lifting away.
Remove the foam element and the rubber seal
from the end of the silencer.
Unscrew the brass silencer then pull out from
the top cover.
Unscrew and remove the two (2) domed nuts
and washers securing the top cover to the main
lid assembly.
Lift the top cover away from the lid assembly.
Shown: Loosen motor clamp
Check that the belt can be twisted by 90 degrees
between the two (2) pulleys.
If the belt can be twisted by more than 90 degrees,
it must be tightened.
The motor is held in an eccentric boss so that
the motor position can be moved closer or
further away from the blade spindle.
Screw the silencer to the end of the air motor.
Loosen the motor securing clamp using an Allen
key.
Shown: Location for loosening clamp
Place a smaller Allen key into one of the holes in
the motor eccentric boss then rotate the motor
eccentric boss clockwise to tighten the belt.
PET Plus User Manual
77
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