30
FabriPulse
®
M
©
2015 American Air Filter Company, Inc. Any use of the text or
images this document contains, without permission of American Air
Filter Company, Inc., is prohibited. FabriPulse, AAF, REDClean,
REDFiltration, and Reliable Efficient Durable are registered
trademarks of American Air Filter Company, Inc. d/b/a AAF
International.
1.
After placing the set of matched belts in the sheave grooves, take up
the slack in the belts by turning the adjustment bolt in the motor mounting
base. Then start the drive. Tension the drive until the belts have only a
slight bow in the slack side of the drive while it is operating under load.
2.
Stop the drive and measure the belt span. Using a spring scale, apply
a force to any of the belts in the center span. The force should be
perpendicular to the span and toward the center of the drive. Measure the
force required to deflect any one of the belts 1/64” for every inch of span
length. For example, the deflection for a 32” span would be 1/64” multiplied
by 32, or ½”.
3.
The amount of force required to deflect the belt should be 4-5 ½
pounds. There will normally be a drop in tension during the first 24 to 48
hours of operation. During the “run-in” period, the belts seat themselves in
the sheave grooves and the initial stretch is removed. After a day or two,
the drive should be stopped again and another check made for the correct
amount of belt tension.
Note: Tension new drives at the maximum deflection force recommended.
Check the tension at least two times during the first day’s operation as there
normally will be a rapid decrease in belt tension until belts have run in.
Check the tension periodically after the first day’s operation and keep
tension in recommended area.
12.6.3
Fan Bearing Replacement
Follow this procedure to replace the fan bearing for the 25 and 30HP integral
fans with belt drives:
1.
Turn adjusting screw in motor base to loosen belts.
2.
Remove sheave from fan shaft.
3.
Remove set collar.
4.
Note exact position of bearings before removing.
5.
Remove bearings by loosening mounting bolts and Skwezloc rings and
slide up off shaft.
