Bearing replacement motors – Twin City General Instructions (Fiberglass Ventilators) - IM-3000 User Manual

Page 5

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Twin City IM-3000

5

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 or wheel and disconnect the

remote lube tubes (if applicable).

4. Measure the location of the bearing to the propeller

or wheel end of the shaft and the bearing spac-

ing.

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 have 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 approx-

imate 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 or wheel may

need to be temporarily installed to get its clear-

ances equal.)

12. Tighten the bearing mounting bolts.
13. Reinstall the lube tubes (if applicable).
14. Install bearing cover, 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 through

#8.

Twin City Fan & Blower recommends periodic checks of

voltage, frequency and current of a motor while in

operation. Such checks assure the correctness of fre-

quency 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 perfor-

mance. 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 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.

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