112
4. Equalize belt slack so that it is on the same side of belt for all
belts. Failure to do so may result in uneven belt stretching.
5. Tension new drives at the deflection force recommended
(Table 31).
On current production, the correct tension information is listed on
the fan drive label. For older equipment or for units with field-
modified drives, use the deflection formula given in the following
example and the tension data from Table 31.
Table 31 — Fan Belt Tension Data
50
100
150
SPAN
INCHES
15 20
25
30
50 100 150
SPAN
INCHES
05
10
15 20 25 30
50 100 150
SPANINCHES
0 5 1015 2025 30
DEFLECTION
FORCE
(LB.)
SMALL
“O” RING
SPAN SCALE
STRAIGHT
EDGE
LARGE “O” RING
V-BELT
ADJACENT
V-BELT
BELT
SPAN
Fig. 56 — Fan Belt Tension
SHEAVE DIAMETER (in.)
DEFLECTION FORCE (lb)
BELT STYLE
SMALLEST SHEAVE
DIAMETER RANGE
RPM RANGE
BELT DEFLECTION FORCE
SUPER GRIP BELTS AND UNNOTCHED
GRIPBANDS
GRIP NOTCH BELTS AND NOTCHED
GRIPBANDS
USED BELT NEW BELT USED BELT NEW BELT
A, AX
3.0 - 3.6
1000-2500
2501-4000
3.7
2.8
5.5
4.2
4.1
3.4
6.1
5.0
3.8 - 4.8
1000-2500
2501-4000
4.5
3.8
6.8
5.7
5.0
4.3
7.4
6.4
5.0 - 7.0
1000-2500
2501-4000
5.4
4.7
8.0
7.0
5.7
5.1
8.4
7.6
B, BX
3
.4 - 4.2
860-2500
2501-4000
—
—
—
—
4.9
4.2
7.2
6.2
4.4 - 5.6
860-2500
2501-4000
5.3
4.5
7.9
6.7
7.1
6.1
10.5
9.1
5.8 - 8.6
860-2500
2501-4000
6.3
6.0
9.4
8.9
8.5
7.3
12.6
10.9
C, CX
7.0 - 9.0
500-1740
1741-3000
11.5
9.4
17.0
13.8
14.7
11.9
21.8
17.5
9.5 - 16.0
500-1740
1741-3000
14.1
12.5
21.0
18.5
15.9
14.6
23.5
21.6
D
12.0 - 16.0
200-850
851-1500
24.9
21.2
37.0
31.3
—
—
—
—
18.0 - 20.0
200-850
851-1500
30.4
25.6
45.2
38.0
—
—
—
—
3V, 3VX
2.2 - 2.4
1000-2500
2501-4000
—
—
—
—
3.3
2.9
4.9
4.3
2.65 - 3.65
1000-2500
2501-4000
3.6
3.0
5.1
4.4
4.2
3.8
6.2
5.6
4.12 - 6.90
1000-2500
2501-4000
4.9
4.4
7.3
6.6
5.3
4.9
7.9
7.3
5V, 5
VX
4.4 - 6.7
500-1749
1750-3000
3001-4000
—
—
—
—
—
—
10.2
8.8
5.6
15.2
13.2
8.5
7.1 - 10.9
500-1749
1750-3000
3001-4000
12.7
11.2
18.9
16.7
14.8
13.7
22.1
20.1
11.8 - 16.0
500-1749
1750-3000
3001-4000
15.5
14.6
23.4
21.8
17.1
16.8
25.5
25.0
8V
12.5 - 17.0
200-850
851-1500
33.0
26.8
49.3
39.9
—
—
—
—
18.0 - 22.4
200-850
851-1500
39.6
35.3
59.2
52.7
—
—
—
—
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