Page 13
507348-04 12/2015
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 19
PULLEY
MOTOR
SIDE VIEW
ALLEN
SCREW
LOOSEN FOUR BOLTS AND
SLIDE BLOWER MOTOR
DOWNWARD TO TIGHTEN BELT
LOOSEN ALLEN
SCREW TO
ADJUST CFM
1- Loosen four bolts securing motor base to mounting
frame. See figure 19.
2-
To increase belt tension -
Slide blower motor downward to tighten the belt. This
increases the distance between the blower motor and
the blower housing.
3-
To loosen belt tension -
Slide blower motor upward to loosen the belt. This
decreases the distance between the blower motor
and the blower housing.
4- Tighten four bolts securing motor base to the
mounting frame.
E-Blower Belt Adjustment - M Volt Units With 3 HP
Blowers Equipped With A Belt Tensioner
1- Remove blower belt.
FIGURE 20
PULLEY ALIGNMENT
BELT
BLOWER
PULLEY
MOTOR
PULLEY
NOT ALIGNED
ALIGNED
2- Remove bracket from blower housing. See figure 22.
3- Remove the screw from the back side of the bracket.
4- Move the tensioner to the appropriate adjustment
hole and reinstall screw.
5- Replace bracket.
6- Replace blower belt. See figure 23.
F-Check Belt Tension - Units Not Equipped With A
Belt Tensioner
Overtensioning belts shortens belt and bearing life.
Check belt tension as follows:
1- Measure span length X. See figure 21.
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.
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
undertensioned belt. A force above these values
indicates an overtensioned belt.
