SCXF-SVX01B-EN 83
Supply Fan
Fan Drive
Perform the following procedures
according to the “Periodic Maintenance
Check List” on page 94.
Disconnect electrical power
source to prevent injury or death
from electrical shock.
1. Rotate the fan wheel to be sure it turns
freely in the proper direction and is not
rubbing on the fan housing, inlet, or
inlet guide vanes. If necessary, center
the fan wheel again.
2. Check the position of both shafts. Fan
and motor shafts should operate
parallel to each other for maximum
belt and bearing life. Shim as
necessary under the motor or fan
bearings to obtain proper alignment.
3. Check the fan motor sheave alignment
with straight edge or a tightly pulled
string. For sheaves of different widths,
place a string in the center groove of
each sheave and pull it tight for a
!
WARNING
center line. See Figure O-M-5 on page
84 for recommended torques.
4. Once the sheaves are properly aligned,
tighten sheave set screws to proper
torque. See Tables O-M-1 and O-M-2 on
page 84 for recommended torques.
5. Check belt tension. Refer to the
“Measuring Belt Tension” section on
page 84.
6. If required, adjust belt to the minimum
recommended tension. Refer to
“Adjusting Belt Tension” section on
page 85.
7. Retighten bearing set screws to the
proper torques after aligning the
sheaves. See Tables O-M-1 and O-M-2
on page 84 for proper torques.
8. Check the fan bearing locking collars
for tightness on the shaft. To tighten the
locking collar, loosen the set screw and
slide the collar into its proper position
over the extended end of the inner
case. Tighten the set screw to the
torque value in Tables O-M-1 and O-M-2
on page 84.
9. During air balancing, verify the sheave
alignment, belt tension, and that the
shaft is parallel.
Figure O-M-3. Fan shaft and motor sheave alignment.
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