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Torque Requirements
Refer to
Table 18
for minimum torque of motor mounting
and bearings bolts. Refer to
minimum set screw torque.
Table 18. Minimum hex head bolt torque in lb.-ft.
(Grade 5 bolts)
Size (inches)
Thread Designation
1/4-20
UNC
1/4-28
65/16-18
UNC
5/16-24
3/8-16
UNC
3/8-24
7/16-14
UNC
7/16-20
1/2-13
UNC
1/2-20
9/16-12
UNC
9/16-18
5/8-11
UNC
5/8-18
3/4-10
UNC
3/4-16
7/8-9
UNC
7/8-14
1-8
UNC
1-14
Note: Soft metric conversions are not acceptable for screw and hex sizes.
Fan Bearing Lubrication
NOTICE:
Bearing Failure!
Do not mix greases with different bases within the
bearing. Mixing grease within the bearing could result
in premature bearing failure.
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
Table 19
for compatible greases and
maximum grease capacity.
Note: Lubricate the motor bearing according to the motor
manufacturer's recommendations and use the
manufacturer-recommended grease. See
Bearing Lubrication" on page
CLCH-SVX009A-EN
Table 16, page 53
for
Minimum Torque
6
UNF
7
14
UNF
16
24
UNF
28
42
UNF
45
69
UNF
83
99
UNF
118
150
UNF
176
254
UNF
301
358
UNF
422
500
UNF
602
Table 20
for
"Motor
61.
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)
1/2 - 3/4
7/8 - 1 3/16
1 1/4 - 1 1/2
1 11/16 - 1 15/16
2 - 2 7/16
2 1/2 - 2 15/16
•
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.
Routine Maintenance
Capacity (fluid ounce)
1/7
3/8
5/8
7/8
1 1/4
2
61
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