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 Ta ble 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 Tabl e 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.
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