Page 18
LGH/LCH036, 048, 060, 072, 074
G-Check Belt Tension
Overtensioning belts shortens belt and bearing life.
Check belt tension as follows:
1- Measure span length X. See figure 22.
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.
MEASURE BELT TENSION
FIGURE 22
DEFLECTION 1/64” PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FORCE
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.
H-Field-Furnished Blower Drives
For field-furnished blower drives, use page 20 through 44
to determine BHP and RPM required. Reference page 45
to determine the drive kit number. Reference table 9 for
manufacturer's drive numbers.
FIGURE 23
ADJUST BELT TENSIONER
MAXIMUM
TENSION
MINIMUM
TENSION
INDICATOR SHOULD BE
BETWEEN MINIMUM AND
MAXIMUM TENSION LINES
FACTORY-SET
POSITION
TIGHTER
BELT
POSITION
TENSIONER
TIGHTEST
BELT
POSITION
BRACKET
TIGHTEN MOUNTING
BOLT TO 22 LB./FT.
USING 9/16” WRENCH
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