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86
CLCH-SVX03C-EN
Routine Maintenance
Fan Bearing Lubrication
NOTICE:
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! See
Table 21
for compatible greases and
Table 22
for
maximum grease capacity.
Note:
Lubricate the bearing according to the motor manufacturer’s recommendations and use the
manufacturer-recommended grease.
•
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.
Refer to
Table 23
for minimum torque of motor mounting and bearings bolts.
Table 21. Compatible Greases
Table 22. Fan bearing maximum grease capacity
Type
Shaft size (inches)
Capacity (fluid ounce)
Texaco Multi Fak 2
1/2 - 3/4
1/7
Shell Alvania 2
7/8 - 1 3/16
3/8
Mobil 532
1 1/4 - 1 1/2
5/8
Chevron Dura-Lith 2
1 11/16 - 1 15/16
7/8
Exxon Beacon
2 - 2 7/16
1 1/4
Keystone 84H
2 1/2 - 2 15/16
2
Table 23. Minimum hex head bolt torque in lb.-ft. (Grade 5 bolts)
Size (inches)
Thread Designation
Minimum 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
Note:
Soft metric conversions are not acceptable for screw and hex sizes.