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Bearing replacement motors – Aerovent IM-172 User Manual

Page 10

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Aerovent IM-172

Fan bearings on belt driven fans should not need to be

replaced for many years if the previous recommenda-

tions are strictly adhered to. However, use the following

procedure when bearing replacement is necessary.
1. Gain access to the fan bearings. Remove the bear-

ing cover, if any.

2. Loosen the belts by shifting the motor.
3. Remove the propeller and disconnect the remote

lubrication tubes (if applicable).

4. Measure the location of the bearing to the propeller

end of the shaft and the bearing spacing.

5. Remove the shaft and bearing assembly. Note the

position of the bearings’ shims (if applicable).

6. Loosen all bearing/shaft setscrews or other locking

devices.

7. Remove bearings (may need to be pressed off the

shaft).

8. Polish the shaft with fine emery paper (240 grit or

finer) and file the setscrew dimples left on the shaft

flat.

Bearing Replacement

Motors

9. Install new bearings on the shaft, making sure that

the collars are together (i.e. facing each other on the

shaft). Lightly seat one setscrew or eccentric locking

collar on each bearing to hold in the approximate

marked position.

10. Mount the shaft/bearing assembly in the fan with

bolts. Do not tighten yet. Just snug up. Loosen the

setscrew.

11. Center the shaft in the housing (both ends) as

closely as possible. (The fan propeller may need

to be temporarily installed to get its clearances

equal.)

12. Tighten the bearing mounting bolts.
13. Reinstall the lube tubes (if applicable).
14. Install propeller and belts and adjust the motor to

get proper belt tension. Also, make sure that the

sheaves are properly aligned.

15. If a new shaft is supplied, ignore items 6 thru 8.

Aerovent recommends periodic checks of voltage, fre-

quency and current of a motor while in operation. Such

checks assure the correctness of frequency and voltage

applied to the motor, and yield an indication of the fan

load. Comparison of this data with previous data will

give an indication of the fan performance. Any serious

deviations could indicate a potential motor failure.
All motors have prelubricated sealed bearings and are

lubricated for the life of the motor.
1. All motors carry a one-year limited warranty from date

of shipment. For repairs within the warranty period,

the motor must be taken to the motor manufacturer’s

authorized service dealer. Contact your representative

for additional warranty details.

2. A periodic motor check should consist of spinning

the motor shaft with the power off to be sure the

motor turns freely and the bearings run smoothly. The

belt on belt driven units should be removed from the

motor pulley.

Repair or replacement of motors is normally performed

by a repair station authorized by the manufacturer.

Contact your representative or the factory for locations

nearest you. DO NOT ship motor to the factory without

specific authorization forms.