Page 24 - Goodyear2011PTMaintenanceManual

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Poly-V ® Belt
INSTALLATION GUIDE
Common Sense Rules of Poly-V® Belt Tensioning
The ideal tension is the lowest tension at which the belt will not slip
under peak load conditions.
Check the belt tension frequently during the frst 24-48 hours of
run-in operation.
Do not over-tension belts. Doing so will shorten belt and bearing life.
Keep belts free from foreign materials that may cause slippage.
Inspect the Poly-V® drive periodically. Re-tension the belts if they
are slipping.
Maintain sheave alignment with a strong straight-edge tool while
tensioning Poly-V® belts.
Run the drive briefy to properly seat the belt. At least one sheave
should rotate freely during the tensioning procedure.
Measure the span length. (See illustration)
Mark the center of span. At the center point, use a tension tester
and apply a force perpendicular to the span large enough to
defect the belt 1/64" for every inch of span length (Ex: a 100"
span requires a defection of 100/64" or 1 9/16").
Compare the actual defection force with the values in Table 15.
A force below the target value indicates under-tension. A force
above the target indicates over-tension.
The following few sections detail other issues that could arise
during a Poly-V® belt drive installation.
BELT GUARDS
Poly-V ® belt drive guards ensure cleanliness and safety.
Screened, meshed, or grilled guards are preferable because
they allow for air circulation and heat escape.
Table 15 - BELT DEFLECTION FORCE
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Tensioning Methods
Choose one of two tensioning methods for Poly-V® belts:
TensionRite® Belt Frequency Meter
Using advanced opt ical technology, our TensionRi te® Bel t
Frequency Meter provides a simple, repeatable and reliable
method for tensioning belts. It displays the natural vibration
frequency of the belt strand so you can closely monitor belt
tension. The device works with all industrial transmission belts
including V-belts, synchronous belts, banded belts and Poly-V®
belts and calculates the corresponding belt tension in either English
or SI units.
Defection Principle
Plunger-type gauges utilize the defection principle to check the
tension of a belt drive.
The gauge defects the center of the belt span and the force of
this defection is compared to a target defection force for the
particular span. Then, one can adjust the belt tension until the actual
defection force equals the target.