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BLOWER ASSEMBLY
TO INCREASE BELT TENSION
1−Loosen four bolts securing motor base to mounting
frame.
2−Slide the motor downward to tighten the belt.
3−Tighten four bolts on motor base.
TO INCREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
FIGURE 8
PULLEY
MOTOR
SIDE VIEW
ALLEN
SCREW
LOOSEN FOUR BOLTS AND
SLIDE BLOWER MOTOR
DOWNWARD TO TIGHTEN BELT
LOOSEN ALLEN
SCREW TO
ADJUST CFM
FIGURE 9
PULLEY ALIGNMENT
BELT
BLOWER
PULLEY
MOTOR
PULLEY
NOT ALIGNED
ALIGNED
E−Check Belt Tension
Overtensioning belts shortens belt and bearing life. Check
belt tension as follows:
1− Measure span length X. See figure 10.
2− Apply perpendicular force to center of span (X) with
enough pressure to deflect belt 1/64" for every inch of
span length or 1.5mm per 100mm of span length.
MEASURE BELT TENSION
FIGURE 10
DEFLECTION 1/64" PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FORCE
Example: Deflection distance of a 40" span would be
40/64" or 5/8".
Example: Deflection distance of a 400mm span would
be 6mm.
3− Measure belt deflection force. For a used belt, the
deflection force should be 5 lbs. (35kPa). A new belt
deflection force should be 7 lbs. (48kPa).
A force below these values indicates an underten-
sioned belt. A force above these values indicates an
overtensioned belt.
F−Field−Furnished Blower Drives
See blower data tables for field−furnished blower drives to
determine BHP and RPM required. See drive kit table on to
determine the drive kit number.
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