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Fig. 14 — Sheave Alignment
6. To determine correct belt tension, use the deflection
formula given below and the tension data from Fig. 15 as
follows:
EXAMPLE:
Given
Belt Span
Belt Cross-Section A, Super Belt
Small Sheave PD
(Belt Span)
Deflection =
64
Solution
1. From Fig. 15 find that deflection force for type A, super
belt with 5-in. small sheave PD is 4 to 5
2.
16
Deflection =
64
3. Increase or decrease belt tension until force required for
/
-in. deflection is 5
/
1
1
4
2
Check belt tension at least twice during first operating
day. Readjust as required to maintain belt tension within
the recommended range.
With correct belt tension, belts may slip and squeal
momentarily on start up. This slippage is normal and disap-
pears after unit reaches operating speed. Excessive belt tension
shortens belt life and may cause bearing and shaft damage.
After run-in, set belt tension at lowest tension at which belts
will not slip during operation.
Record information on the label (Fig. 16) found on the door
of the fan section.
16 in.
5 in.
1
/
lb.
2
lb.
SMALL
BELT
SHEAVE
CROSS
PD RANGE
SECTION
(in.)
3.0- 3.6
A
3.8- 4.8
5.0- 7.0
3.4- 4.2
B
4.4- 5.6
5.8- 8.6
7.0- 9.4
C
9.6-16.0
2.65-3.65
3V
4.12-6.90
4.40-6.70
5V
7.1-10.9
11.8-16.0
12.5-17.0
8V
18.0-22.4
PD — Pitch Diameter, inches
Fig. 15 — Fan Belt Tension Data
TENSION BELTS TO SPECIFICATION
SHOWN ON DRIVE LABEL. OVER
TENSIONING BELTS WILL SEVERELY
REDUCE BELT AND BEARING LIFE.
REPLACEMENT PARTS
BEARINGS
DRIVE _______________________
FREE ________________________
SHAFT
________________________
WHEEL ________________________
INLET CONE ____________________
TO ORDER REPLACEMENT PARTS,
(REPLACEMENT COMPONENTS DIVISION)
Fig. 16 — Fan Section Label
13
DEFLECTION FORCE — LB
Super
Notch
Steel Cable
Belts
Belts
Min
Max
Min
Max
Min
1
7
1
3
4
/
3
/
5
/
3
4
8
2
3
1
/
5
4
1
/
6
1
/
3
2
2
4
4
5
1
/
5
6
7
/
4
2
8
4
5
1
/
5
3
/
8
4
2
4
1
1
1
1
5
/
7
/
6
/
9
/
5
8
8
2
8
3
3
3
1
6
/
8
/
7
/
10
/
7
8
4
8
8
1
3
3
7
11
/
14
/
13
/
17
/
11
4
8
4
8
14
1
/
18
1
/
15
1
/
20
1
/
14
8
2
4
4
3
1
/
5
3
7
/
5
1
/
—
2
8
2
4
3
/
6
7
/
5
1
/
7
7
/
—
4
8
4
8
—
—
10
15
—
1
3
7
3
10
/
15
/
12
/
18
/
—
2
4
8
4
1
13
19
/
15
22
—
2
27
40
1
/
—
—
—
2
30
45
—
—
—
NOTICE
CONTACT: RCD
1-800-443-4410
Belts
Max
4
3
/
4
3
/
4
4
1
/
5
1
/
4
4
1
/
5
1
/
2
2
3
1
/
7
/
4
4
3
8
/
4
1
/
14
4
1
/
17
3
/
4
4
—
—
—
—
—
—
—
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