SCXF-SVX01Q-EN
89
Table 48. Fan hub and sheave torques
Unit size
Fan
Diameter
Set Screw
Size
Torque (ft-
lbs)
SCWF 20
18"
5/16"
12SCWF 22
SCWF 25
SCWF 29
18"
5/16"
12
SCWF 32
SCRF 25
SCRF 30
SCWF 35
20"
5/16"
14
SCWF 38
SCRF 30
SCRF 35
SCWF 42
25
3/8"
24
SCWF 46
SCWF 52
SCWF 58
SCRF 40
SCRF 50
SCWF 65
27
3/8"
24
SCWF 72
SCWF 80
SCRF 60
SCWF 90
SCWF C0
SCWF C1
Adjusting Belt Tension
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Figure 42. Belt tension gauge (top) and fan belt
adjustment (bottom)
To adjust belt tension see Figure 42, p. 89 and perform
the following procedure:
1. Loosen bolts A, B, and E on both sides of the sliding
motor base. See Figure 43, p. 90.
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. 90
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.
MMaaiinntteennaannccee
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