Page 19 - Goodyear2011PTMaintenanceManual

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INSTALLATION GUIDE
Torque Team ® V-Belt
Enter the required strand installation tension per rib into the
formula, along with the Modulus Factor that corresponds to
the cross section of the Torque Team® belt, to determine
the Belt Length Multiplier.
Multiply the gauge length by the Belt Length Multiplier to
determine the fnal gage length at the installation tension.
Example:
A 5/5V1250 belt is to be installed at 1400 lbs. The
Modulus Factor is 25622 lbs/in/in from table 11. The
installation force is divided by the number of ribs in the
Torque Team (1400/5 = 280 lbs). The Belt Length
Multiplier is calculated next.
Belt Length Multiplier = 1 + 280/25622 = 1.0109
Outside Belt Circumference at installation tension = 1.0109
x 125 = 126.4 inches.
In other words, the belt is elongated 1.4 inches at installation
tension.
These multipliers do not apply to Torque Team Plus® belts.
Inside Idler
A V-grooved idler located on the inside of the belts on the slack
side of the drive is preferable to a back side idler. Locate the idler
near the large sheave to avoid reduction of the arc of contact with
the small sheave. Note that the size of the V-idler pulley should
be equal to or larger (preferably) than the diameter of the small
sheave.
Back Side Idler
A back side idler increases the arc of contact on both sheaves.
However, such an idler also forces a backward bend in the V-belt,
which contributes to unwanted wear such as bottom cracking and
premature failure. If a back side idler is the only option, follow two
guidelines: (1) make sure the diameter of the fat idler pulley is
at least 1.5 times the diameter of the small sheave and (2) locate
the back side idler as close as possible to the small sheave on the
slack side.
The following few sections detail other issues that could
arise during Torque Team® V-belt drive installation.
BELT GUARDS
IDLERS
Avoid the use of idlers if at all possible. A properly
designed Torque Team® V-belt drive will not require an idler
to deliver fully rated horsepower. Idlers put an additional
bending stress point on belts, which reduces a belt’s
horsepower rating and its life. Also, remember the smaller
the idler, the greater the stress and the shorter a belt’s life.
However, if the drive design requires an idler, observe the
following design recommendations.
Kiss Idler
Unlike the back side idler, the kiss idler does not penetrate the
belt span and create a back bend. Consequently, the kiss idler does
not contribute to premature failure. The kiss idler can help control
belt vibration and whip on drives subject to shock and pulsating
loads. When using a kiss idler, make sure the diameter of the
fat pulley is at least 1.5 times the diameter of the small sheave on
the slack side.
V-belt drive guards ensure cleanliness and safety.
Screened, meshed, or grilled guards are preferable
because they allow for air circulation and heat escape.
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