FumeJet
®
Fume Exhaust Fans
11
®
Bearing Lubrication Schedule
Shaft bearings are the most critical moving part of a
fan. Therefore, special attention should be given to
keeping the bearings clean and well lubricated. Proper
lubrication provides for reduction in friction and wear,
transmission and dissipation of heat, extended bearing
life and prevention of rust.
In order for a lubricant to fulfill these tasks, the proper
grease applied at regular intervals is required. See the
recommended bearing lubrication schedule below.
If unusual conditions exist [temperatures below 32°F
(0°C)
or above 200°F
(93°C)
], moisture or contaminants
- more frequent lubrication is required.
• Lubrication interval is based on 12 hour per day operation
and maximum 160°F
(80°C)
housing temperature. For 24
hour per day operation, the interval should be cut in half.
• Lubricant should be added with the shaft rotating and
until clean grease is seen purging from the bearing.
The lubrication interval may be modified based on the
condition of the purged grease. If bearing is not visible to
observe purged grease, lubricate with number of shots
indicated in chart for bore size.
• For conditions including high temperatures, moisture, dirt
or excessive vibration, consult the factory for a specific
lubrication interval for your application.
• Lubricant should be a high quality lithium complex grease
conforming to NLGI Grade 2. Factory recommends
Mobilux EP-2.
• The use of synthetic lubricants will increase lubrication
intervals by approximately 3 times.
In addition to lubricating the bearings at specified
intervals, set screws in the bearing collars should be
checked for tightness. A bearing collar which has
loosened will cause premature failure of the fan shaft.
Fasteners attaching the bearings to the drive frame
should also be checked.
Wheel and Fastener Maintenance
Wheels require very little attention when exhausting
clean air, however, air heavily laden with grease or
dirt will tend to accumulate on the wheel causing
unbalance. Wheels exhausting dirty or grease-laden air
require frequent cleaning to assure smooth and safe
operation.
All fasteners, including set screws in the bearing collars,
should be checked for tightness each time maintenance
checks are performed.
A proper maintenance program will help preserve the
performance and reliability designed into the fan.
Recommended Bearing Lubrication Schedule
Relubrication Schedule in Months
Standard Grease
Fan
RPM
Bearing Bore (mm)
20 - 25
30 - 35
40 - 45
50 - 55
60 - 65
To 250
12
12
12
12
12
500
12
12
11
10
8
750
12
9
8
7
6
1000
12
7
6
5
4
1250
12
6
5
4
1500
12
5
4
3
2000
12
3
3
2
2500
12
2
2
3000
12
2
3500
12
4000
12
5000
12
Replenishing
Quantity
(gms)
2.5
4.5
6
8
10.5
Grease Manufacturers
Manufacturer
Grease (NLGI #2)
U.S. Electric Motors
Grease No. 83343
Chevron U.S.A. Inc
Chevron SRI Grease #2
Mobil Oil Corporation
Mobilith
Mobil 532
Texaco, Inc.
Premium BRB #2
Texaco Multifak #2
Amoco Oil Co.
Rykon Premium #2
Exxon
Unirex N2
Shell
B Shell Alvania #2
Suggested Fan Bearing Greasing Intervals
Interval
(months)
Type of Service
1 to 3
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.
3 to 6
12 to 24 hours per day, heavy duty, or if moisture
is present
6 to 12
8 to 16 hours per day in clean, relatively dry
atmosphere
12 to 18
Infrequent operation or light duty in clean
atmosphere
Recommended Relubrication &
Frequency Intervals in Months
NOTE: If unusual environment conditions exist (extreme
temperature, moisture or contaminants) more frequent
lubrication is required.
A good quality lithium base grease, conforming to
NLGI Grade 2 consistency, such as those listed here
may be used.
