Manual 2017 Rev C p/n 2017
20
05
Installation
Setting V-Belt Tension
Proper belt tension is essential to long blower
life. Figure 5-4, Figure 5-5, and the following
procedure are provided to aid in ¿ eld-adjusting
V-belts (when the blower is so equipped) for
maximum performance. A visual inspection of the
V-belt drive should yield the appearance shown in
Figure 5-4.
Too Tight
Slight Bow
Too Loose
Figure 5-4 – General appearance of a V-belt drive
20/64” = 5/16” (8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Figure 5-5 – Setting of proper tension for a V-belt drive
Factors outside the control of the belt tensioning
system used on an individual blower package
assembly, such as environmental factors and
quality of the belts installed, may contribute to
decreased belt life. Such factors can cause wear
of the belts beyond the ability of the tensioning
system to compensate.
As such, it is recommended to check belt tension
monthly and make any manual adjustments found
necessary.
1. Turn off and lock out power.
2. Remove the belt guard fasteners (if equipped).
3. Remove the belt guard.
4. Check and adjust the belt tension as
necessary. Tension should be 1/64 in.
deÀ ection per inch of span (0.157 mm
deÀ ection per centimeter of span) between
sheaves, with 8 – 10 lb (3.6 – 4.5 kg) force
applied at the center point of the top section of
belt.
5. Install the belt guard, making sure that all drive
components are free of contact with the guard.
6. Install the belt guard fasteners that were
removed in step 2.
7. Unlock the power and start the blower.
8. Resume normal operation.
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