Fan Drives - BAC VX Series Operation & Maintenance Manual

Fan Drives

The fan belt should be checked and
adjusted every month. To properly
adjust the belt tension, position
the fan motor so that a single belt
will deflect 10mm when moderate
pressure of one finger is applied
midway between the sheaves (See
Figure 12). The position of the fan
motor can be changed by rotating
the motor base adjusting screw
which extends through the bottom
frame angle.
The drive alignment should be
checked annually to ensure
maximum belt life. This can be
done by placing a straightedge
across both sheaves as shown in
Figure 7.
When the drive is properly aligned, the straightedge will contact all
four points as indicated. If realignment is necessary, loosen the motor
sheave and align it with the fan sheave. Allow approximately 6mm
for draw-up as the motor sheave is pulled tight on the bushing; then
retighten the bushing screw.
Figure 12. Checking Sheave Alignment
Figure 11. Fan Belt Adjustment
Detailed Component
Maintenance Procedures
Locking Collars
Adjustable Motor Base
Fan Drives
NOTE: There should be no 'chirp'
or 'squeal' when the fan motor is
started.
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