17
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. The motor sheave must also fi t correctly and be properly aligned
with the blower sheave.
Adjust motor position on its sliding base so that belt tension is in accordance with drive manufacturer’s
instructions. Avoid excessive belt tension at all times. Recheck tension after the fi rst ten 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. If it does not
rotate freely, look for uneven mounting, piping strain, excessive belt tension, or coupling misalignment.
Check blower at this time to insure oil was added to the reservoirs.
5.5.3 SETTING V-BELT TENSION
Proper belt tension is essential to long blower
life. The following diagrams and procedures are
provided to aid in fi eld adjusting V-belts (when
blower is so equipped) for maximum performance.
A visual inspection of the V-belt drive should yield
the appearance shown in Figure 6.
Factors outside the control of the belt tensioning
system used on an individual blower package
assembly may contribute to decreased belt life,
such as environmental factors, and quality of the
belts installed. This 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. It should be 1/64” defl ection per inch of span (0.157 mm) defl ection per centimeter of span)
between sheaves, with 8-10 lbs. (3.6-4.5 kg) force applied at 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 belt guard fasteners removed in step 2.
7. Unlock the power and start your blower.
8. Resume normal operation.
Too Tight
Slight Bow
Too Loose
20/64” = 5/16”
(8 mm)
20”
(50.8 cm)
8-10 lbs.
(3.6-4.5 kg)
Figure 6 - General appearance of a V-Belt drive
Figure 7 - Setting of proper tension for a V-Belt drive
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