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Figure 41. Fan shaft and motor sheave alignment
Fan Bearings
The opposite drive end bearing is a special bearing with
close tolerance fit of balls and races. Replace this bearing
with the same part number as the original bearing.
NOTICE
Bearing Failure!
Do not mix greases with different bases within the
bearing as it could result in premature bearing failure.
Table 38. AO smith bearing lubrication schedule
Speed
Service
Standard
Over 1800
Frame
Service
rpm
All
6 months
1800 rpm
140-180
2 1/2 yrs
210-280
320-360
1 1/2 yrs
400-440
Note: Service standard - 8 hrs/day, normal to light loading, 100°F ambient
temp. max. Severe service - 24 hrs/day, shock loading, vibration,
dirt or dust, 100°F to 150°F ambient temp. Extreme service - heavy
shock or vibration, dirt or dust, 100°F to 150°F ambient temp.
Table 39. Compatible with NLGI grade 2 lithium fan
bearing greases
Shell Alvania EP2
Mobile SHC 220
FINA LICAL
SCXF-SVX01T-EN
Severe
Service
Extreme
3 months
3 months
3 yrs
1 yr
6 mths
10 1/2 mths
5 1/2 mths
2 yrs
9 mths
4 1/2 mths
8 mths
4 mths
Type
Table 40. Compatible with NLGI grade 2 lithium fan
bearing greases
Recommended Grease
FINA LICAL
Shell Alvania EP2
Mobile SHC 220
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 42, p.
80. Use the following procedure 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
42, p.
80. Place a straight edge across the sheaves as
a reference point. See
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 . If necessary, readjust belt tension.
Table 41. Fan hub and sheave torques
Unit size
Fan Diameter
SCWF 20
SCWF 22
18"
SCWF 25
SCWF 29
18"
SCWF 32
SCWF 35
20"
SCWF 38
Maintenance
Recommended Operating
Range
20°F to 205°F
Figure
Figure 41, p.
79.
Set Screw
Torque (ft-
Size
lbs)
5/16"
12
5/16"
12
5/16"
14
79
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