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
Table 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
