maintenance

Maintenance procedures

Fan BeltTension

Note: Check fan belt tension at least twice during the first days of new belt operation since there is a rapid decrease in tension until belts are run-in.

Proper belt tension is necessary to endure maximum bearing and drive component life and is based on fan brake horsepower requirements. If frayed or worn, replace belts in matched sets.

Measuring BeltTension Measure fan belt tension with a Browning, Gates, or equivalent belt tension gauge. Determine deflection by dividing the belt span distance (in inches) by 64. See Figure M-MP-6. Follow the procedure below to measure belt tension.

1.Measure belt span between centers of sheaves and set the large “O” ring of the tensioning gauge at 1/64 inch for each inch of belt span.

2.Set the load “O” ring at zero.

3.Place the large end of the gauge at the center of the belt span. Press down until the large “O” ring is even with the top of the belt line or the next belt as in Figure M-MP-6. Place a straight edge across the sheaves as a reference point. See Figure M-MP-4.

4.Remove the gauge. Note that the load “O” ring now indicates a number on the plunger scale. This number represents pounds of force required to deflect the belt.

5.Check the reading from step 4 against the values given inTable M-MP-4. If necessary, readjust belt tension.

Table M-MP-4. Fan shaft bearing torques

setscrew

hex-size

recommended torque

size

across flats

In-lb

ft-lb

1/4"-20

1/8"

180

15

5-16"-18

5-32"

402

33.5

Table M-MP-5. Fan hub and sheave torques

 

unit

fan

setscrew

torque

 

size

dia.

size

(ft-lbs)

 

SCWF 20

16.5"

5/16"

12

 

SCWF 22

 

 

 

 

SCWF 25

 

 

 

 

SCRF 20

 

 

 

 

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

Figure M-MP-5. Belt tension gauge

SCWF 72

SCWF 80

SCRF 60

SCWF 90

SCWF C0

SCWF C1

deflection = belt span/64

Figure M-MP-6. Fan belt adjustment

96

SCXG-SVX01B-EN

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Page 96
Image 96
Trane SCXG-SVX01B-EN manual Fan BeltTension, Deflection = belt span/64, Table M-MP-4. Fan shaft bearing torques
Page 95 Page 97

SCXG-SVX01B-EN specifications

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