Routine Maintenance
CLCH-SVX009A-EN 61
Torque Requirements
Refer to Table 18 for minimum torque of motor mounting
and bearings bolts. Refer to Table 16, page 53 for
minimum set screw torque.
Fan Bearing Lubrication
For belt-drive fans, 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
Tabl e 19 for compatible greases and Table 20 for
maximum grease capacity.
Note: Lubricate the motor bearing according to the motor
manufacturer’s recommendations and use the
manufacturer-recommended grease. See “Motor
Bearing Lubrication” on page 61.
• 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.
Motor Bearing Lubrication
Obtain an operation and maintenance manual from the
motor manufacturer for the specific motor installed. The
motor manufacturer’s recommendations take precedence
for all matters related to the start-up and routine
maintenance of the motor.
Motor grease fittings have been removed from factory-
installed motors in compliance with UL regulations. Motor
bearings require periodic maintenance throughout their
life. Many different styles of motors come as standard
selections, so please obtain the motor IOM and use the
manufacturer-recommended grease.
Fan Motor Inspection
Inspect fan motors periodically for excessive vibration or
temperature. Operating conditions will vary the frequency
of inspection and lubrication. Motor lubrication
instructions are on the motor tag or nameplate. If for some
reason these instructions are not available, contact the
motor manufacturer. Some motor manufacturers may not
provide oil tubes on motors with permanently sealed
bearings.
Table 18. 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.
NOTICE:
Bearing Failure!
Do not mix greases with different bases within the
bearing. Mixing grease within the bearing could result
in premature bearing failure.
Table 19. Compatible Greases
Type
Texaco Multi Fak 2
Shell Alvania 2
Mobil 532
Chevron Dura-Lith 2
Exxon Beacon
Keystone 84H
Table 20. Fan bearing maximum grease capacity
Shaft size (inches) Capacity (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
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