Fan Bearing Lubrication

Trane Custom Climate Changer Air Handlers manual Fan Bearing Lubrication, Fan Motor Inspection

Routine Maintenance

See “ WARNING Hazardous

Voltage with Capacitors!” on page 49 regarding disconnection of power.

CAUTION

Bearing Failure!

Do not mix greases with different bases within the bearing. Mixing grease within the bearing may result in premature bearing failure.

The grease used in electric motor bearings is usually not compatible with the grease used in fan bearings. Never mix the two grease types!

Note: Lubricate the bearing according to the motor manufacturer’s recommendations and use the manufacturer- recommended grease.

Refer to Table 6 for minimum torque of motor mounting and bearings bolts.

CAH-SVX01A-EN

Table 6. Minimum hex head bolt torque in lb.-ft. (Grade 5 bolts)

Size	Thread	Minimum
(inches)	Designation	Torque

1/4-20	UNC	6
1/4-28	UNF	7
65/16-18	UNC	14
5/16-24	UNF	16
3/8-16	UNC	24
3/8-24	UNF	28
7/16-14	UNC	42
7/16-20	UNF	45
1/2-13	UNC	69
1/2-20	UNF	83

9/16-12	UNC	99
9/16-18	UNF	118
5/8-11	UNC	150
5/8-18	UNF	176
3/4-10	UNC	254

3/4-16	UNF	301
7/8-9	UNC	358
7/8-14	UNF	422
1-8	UNC	500
1-14	UNF	602

Soft metric conversions are not acceptable for screw and hex sizes.

•Fan bearings without lubrication lines are sealed bearings. Re- lubrication is not required.

•Fan bearings equipped with lubrication lines should be lubricated with a lithium-based grease that conforms to NLGI No. 2 for consistency.

Compatible greases include:

–Texaco Multi Fak 2

–Shell Alvania 2

–Mobil 532

–Chevron Dura-Lith 2

–Exxon Beacon

–Keystone 84H

Motor bearings are factory- lubricated for normal life. In the case of a double-shielded bearing, the grease provided is that which is in the bearing. To regrease motors without grease fittings:

1Remove the bearing brackets.

2If the original bearing is to be relubricated, remove the shield opposite the rotor.

a Do not replace.

b Flush old grease from bearing with suitable solvent.

3Lubricate the bearing and add grease to the bearing chamber. The chamber should be three- quarters full of grease. (An alternate method is to replace the old bearing with a new double-shield pre lubricated bearing.) See Table 7 for maximum grease capacity.

Note: Lubricate the bearing according to the motor manufacturer’s recommendations and use the manufacturer- recommended grease.

4Reassemble the motor.

Fan Motor Inspection

Inspect fan motors periodically for excessive vibration or temperature.

Table 7. Fan bearing maximum grease capacity

Shaft size			Capacity
(inches)			(fluid ounce)
1/2 - 3/4			1/7
7/8 - 1 3/16			3/8
1 1/4 -	1	1/2	5/8
1 11/16 -	1	15/16	7/8
2 - 2 7/16			1 1/4
2 1/2 - 2 15/16			2