80
SCXF-SVX01T-EN
Table 41. Fan hub and sheave torques (continued)
Unit size Fan Diameter Set Screw
Size
Torque (ft-
lbs)
SCWF 42
25” 3/8" 24
SCWF 46
SCWF 52
SCWF 58
SCWF 65
27” 3/8" 24
SCWF 72
SCWF 80
SCWF 90
SCWF C0
SCWF C1
Adjusting Belt Tension
NOTICE
Belt Tension!
Do not over-tension belts as it could reduce fan and
motor bearing life, accelerate belt wear and possibly
cause shaft failure.
Figure 42. Belt tension gauge (top) and fan belt
adjustment (bottom)
To adjust belt tension see Figure 42, p. 80 and perform the
following procedure:
1. Loosen bolts A, B, and E on both sides of the sliding
motor base. See Figure 43, p. 81.
2. Loosen nuts C and D (as required for motor
horsepower) to slide the motor on its mounting plate in
the proper direction to tension or relieve tension on the
belt.
3. Adjust nuts A-D and bolt E. Do not stretch the belts
over the sheaves.
4. Retighten all nuts and bolts.
5. Verify tension is adjusted properly.
Recommended belt tension range values are on the unit
fan scroll. To access the fan scroll, face the right-hand side
of the unit and remove the top left panel. The belt tension
label is on the top right-hand corner of the fan scroll. See
Figure 43, p. 81
The correct operation tension for a V-belt drive is the lowest
tension at which the belt will not slip under the peak load
conditions. It may be necessary to increase the tension of
some drives to reduce flopping or excessive startup
squealing.
Maintenance
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