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96 SCXG-SVX01B-EN
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
SCWF 72
SCWF 80
SCRF 60
SCWF 90
SCWF C0
SCWF C1
Figure M-MP-6. Fan belt adjustment
Figure M-MP-5. Belt tension gauge
Fan Belt Tension
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 Belt Tension
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 in Table M-MP-4. If
necessary, readjust belt tension.
deflection = belt span/64
Maintenance
maintenance
procedures