Page 29
BOLT
PULLEY ALIGNMENT - WITH TENSIONER
FIGURE 12
NUT
ALIGN
TENSIONER
MARKS
ADJUSTABLE
PULLEY
FIXED
PULLEY
TENSIONER
TENSIONER BOLT AND
ADJUSTMENT NUT
Blowers Equipped With Belt Tensioner
1. Loosen the bolt in the center of the tensioner. See fig
ure 12.
2. Place belt over all three pulleys.
3. Using a 15/16” wrench, turn the tensioner nut until
marks align as shown in figure 12.
4. Hold the tensioner with marks aligned and tighten the
bolt to 23 ft.lbs. using the 9/16” wrench.
E-Check Belt Tension
Overtensioning belts shortens belt and bearing life. Check
belt tension as follows:
1. Measure span length X. See figure 13.
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 de
flection force should be 5 lbs. (35kPa) . A new belt de
flection force should be 7 lbs. (48kPa).
A force below these values indicates and underten
sioned belt. A force above these values indicates an
overtensioned belt.
MEASURE BELT TENSION
FIGURE 13
DEFLECTION 1/64” PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FORCE
F-Field-Furnished Blower Drives
See BLOWER DATA tables for blower drives.
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