Manual 2007 Rev B p/n 2007
21
05
Installation
A tight or driving fi t will force the drive shaft out of
its normal position and cause internal damage. A
loose fi t will result in shaft damage or breaking.
Make sure the motor sheave fi ts correctly and is
properly aligned with the blower sheave.
Adjust the motor position on its sliding base so
that belt tension is in accordance with the drive
manufacturer’s instructions. Always avoid excessive
belt tension. Recheck tension after the fi rst 10
hours of operation and periodically thereafter to
avoid slippage and loss of blower speed.
Check blower after installation and before applying
power by rotating the drive shaft by hand.
Too Tight
Slight Bow
Too Loose
Figure 5-7 – 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 5-8 – Setting of proper tension for a V-belt drive
Check the blower after installation and before
applying power by rotating the drive shaft by hand.
If the drive shaft does not rotate freely:
• Look for uneven mounting, piping strain,
excessive belt tension, or coupling misalignment.
• Check the blower to make sure oil was added to
the reservoirs.
Setting V-Belt Tension
Proper belt tension is essential to long blower
life. Figure 5-7, Figure 5-8, and the following
procedure are provided to aid in fi 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 5-7.
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 fasteners from the belt guard (if
equipped).
3. Remove the belt guard.
4. Check and adjust the belt tension as
necessary. Tension should be 1/64 in.
defl ection per inch of span (0.157 mm
defl 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
the 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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