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Table 15. Typical sheave diameter and deflection force
Smallest sheave
Cross
diameter range
section
(in.)
3.0–3.6
A, AX
3.8–4.8
5.0–7.0
3.4–4.2
B, BX
4.4–5.6
5.8–8.6
7.0–9.0
C, CX
9.5–16.0
12.0–16.0
D
18.0–20.0
2.2–2.4
3V, 3VX
2.65–3.65
4.12–6.90
4.4–6.7
5V, 5VX
7.1–10.9
11.8–16.0
12.5–17.0
8V
18.0–22.4
Determine Fan Speed
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
measure the speed of rotating components. Have a
qualified licensed service individual who has been
properly trained in handling exposed rotating
components perform these tasks. Failure to follow all
safety precautions when exposed to rotating
components could result in death or serious injury.
52
Super gripbelts and
unnotched gripbands
Speed (rpm)
range
Used belt
1,000–2,500
3.7
2,501–4,000
2.8
1,000–2,500
4.5
2,501–4,000
3.8
1,000–2,500
5.4
2,501–4,000
4.7
860–2,500
n/a
2,501–4,000
n/a
860–2,500
5.3
2,501–4,000
4.5
860–2,500
6.3
2,501–4,000
6.0
500–1,740
11.5
1,741–3,000
9.4
500–1,740
14.1
1,741–3,000
12.5
200–850
24.9
851–1,500
21.2
200–850
30.4
851–1,500
25.6
1,000–2,500
n/a
2,501–4,000
n/a
1,000–2,500
3.6
2,501–4,000
3.0
1,000–2,500
4.9
2,501–4,000
4.4
500–1,749
n/a
1,750–3,000
n/a
3,001–4,000
n/a
500–1,749
12.7
1,750–3,000
11.2
500–1,749
15.5
1,750–3,000
14.6
200–850
33.0
851–1,500
26.8
200–850
39.6
851–1,500
35.3
Belt Deflection Force (lbs)
New belt
5.5
4.2
6.8
5.7
8.0
7.0
n/a
n/a
7.9
6.7
9.4
8.9
17.0
13.8
21.0
18.5
37.0
31.3
45.2
38.0
n/a
n/a
5.1
4.4
7.3
6.6
n/a
n/a
n/a
18.9
16.7
23.4
21.8
49.3
39.9
59.2
52.7
Fan speed can be determined using a strobe-type
tachometer, or revolution counter.
Check unit vibration if the fan speed is changed more than
five percent from the original designed speed, or if parts
such as shafts, fan wheels, bearings, or other drive
components are replaced. Do not exceed the maximum
fan speed.
Pay particular attention to any vibration, noise, or
overheating of the motor and fan bearings; however, note
that bearings may run warm during break in.
Gripnotch belts and
notched gripbands
Used belt
New belt
4.1
6.4
3.4
5.0
5.0
7.4
4.3
6.4
5.7
9.4
5.1
7.6
4.9
7.2
4.2
6.2
7.1
10.5
7.1
9.1
8.5
12.6
7.3
10.9
14.7
21.8
11.9
17.5
15.9
23.5
14.6
21.6
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
3.3
4.9
2.9
4.3
4.2
6.2
3.8
5.6
5.3
7.9
4.9
7.3
10.2
15.2
8.8
13.2
5.6
8.5
14.8
22.1
13.7
20.1
17.1
25.5
16.8
25.0
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
CLCH-SVX009A-EN
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