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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.
Recommended Bearing Lubrication Schedule
Relubrication Schedule in Months
Standard Grease
Bearing Bore (inches)
Fan
RPM
1/2 -1
1
1
⁄
- 1
1
8
To 250
12
12
500
12
12
750
12
9
1000
12
7
1250
12
6
1500
12
5
2000
12
3
2500
12
2
3000
12
2
3500
12
1
4000
12
0.5
5000
12
0.25
Number
4
8
of Shots
•
Lubrication interval is based on 12 hour per day operation
and maximum 160°F 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.
®
⁄
1
5
⁄
- 1
7
⁄
1
15
⁄
- 2
3
⁄
2
7
⁄
2
8
8
16
16
16
12
12
12
11
10
8
8
7
6
6
5
4
5
4
3
4
3
2
3
2
1
2
1
0.5
1
0.5
0.25
0.5
0.25
x
0.25
x
x
x
x
x
8
10
16
Field Adjustable Nozzle
When ordered with an adjustable nozzle, the FumeJet
will arrive at the job site with the nozzle preset at the
factory based on the order. Depending on installed air
performance, this nozzle can be adjusted in the field to
accommodate the building situation.
To increase the exhaust velocity and plume height,
close the adjustable nozzle when possible. Verify the
fan speed and motor horsepower to ensure system can
manage the increased pressure the fan must overcome.
To lower velocity and decrease plume height, open the
adjustable nozzle.
- 3
Pre-drilled adjustment holes
available for increasing or
decreasing outlet area.
To modify the area on the field adjustable nozzle,
remove the bolts from each side and move the plate to
the desired position. Bolts are to be located in the same
hole on each side of the plate, but each plate can be
adjusted independently. Replace the bolt and tighten.
After any change, verify the system exhaust for proper
amount of air volume being exhausted.
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.
®
FumeJet
Fume Exhaust Fans
15
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