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Fan Shaft Bearing Removal
1. Lock open and tag electrical disconnect.
2. Enter through fan section access door or remove panels as
required.
3. Place plywood or other rigid covering on floor to protect
insulation from damage.
4. Block wheel so that it will not pinwheel due to natural
draft through the unit.
5. Loosen motor base to frame bolts. Adjust motor to re-
lease belt tension so removal of belts is done without
stretching. Do not stretch belts over sheaves. Damage to
belt can result.
6. Remove bolts on bushing of fan shaft sheave, insert bolts
in jacking hole provided on bushing and slowly jack
bushing from sheave. Then remove bushing on sheave.
7. Loosen bearing setscrews and locking collar.
8. Remove bearing holddown bolts.
9. Remove bearing while observing the following
precautions:
a. Make certain fan shaft surface is not rough or
scored. If so, clean up surface with fine emery
cloth.
39L UNIT SIZE
Angle Filter Section
Filter Qty...Size (in.)
Nominal Face Area (sq ft)
Filter Mixing Box Section
Filter Qty...Size (in.)
Nominal Face Area (sq ft)
Flat Filter Section
Filter Qty...Size (in.)
Nominal Face Area (sq ft)
Table 14 — Filter Data
03
06
08
2...16x20
2...16x25
4...16x20
2...16x25
5.56
8.89
10.00
2...16x20
2...16x25
4...16x20
2...16x25
5.56
8.89
10.00
2...16x16
2...20x20
2...20x25
3.56
5.56
6.94
b. Add a few drops of oil after cleanup of shaft end.
It should not be necessary to drive a new bearing onto
shaft. If light tapping is needed, do not tap against outer
race.
10. Check fan shaft diameter at bearing mount. If worn by
more than .001 in. below nominal, shaft should be re-
placed.
11. Install new bearing, tighten holddown bolts and then
tighten bearing locking collar and setscrews.
12. Make certain fan wheel does not rub sides of fan housing
after installing new bearings.
13. Recoat fan shaft with a rust inhibitor or grease.
14. Replace sheave and belts. Adjust and align as described
in Installation sections on installing sheaves and V-belts.
15. Remove insulation protection.
16. Replace access panels.
17. Restore electrical power.
10
12
15
4...16x25
6...16x20
9...16x20
11.11
13.33
20.00
4...16x25
6...16x20
9...16x20
11.11
13.33
20.00
2...16x25
3...20x25
6...16x20
1...20x25
9.03
10.42
13.33
43
CAUTION
18
21
4...16x20
4...16x20
12...16x20
8...16x25
8...16x25
26.67
31.11
31.11
3...16x20
4...16x20
9...16x20
6...16x25
8...16x25
20.00
23.33
31.11
2...16x20
3...16x20
3...20x25
2...20x20
3...20x20
3...16x25
2...20x25
2...16x25
15.00
18.75
22.50
25
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