Universal Single Width Fans 17
®
Recommended Bearing Lubrication Schedule
Relubrication Schedule in Months
Standard Grease
Fan
RPM
Bearing Bore (inches)
1/2 -1 1
1
⁄8 - 1
1
⁄2 1
5
⁄8 - 1
7
⁄8 1
15
⁄16 - 2
3
⁄16 2
7
⁄16 - 3
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 3
1500 12 5 4 3 2
2000 12 3 3 2 1
2500 12 2 2 1 0.5
3000 12 2 1 0.5 0.25
3500 12 1 0.5 0.25 x
4000 12 0.5 0.25 x x
5000 12 0.25 x x x
Number
of Shots
4 8 8 10 16
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 or above 200°F), moisture or contaminants - more frequent
lubrication is required.
• 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.
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.
Model USF Series 100, Belt Drive – Belt Adjustment
Belts on the USF series 100 are adjusted from the exterior of the fan. The end cover must be removed so that
the belt(s) can be inspected and checked for proper tension.
1. Loosen, but DO NOT remove the four corner bolts on the adjustment plate.
2. Loosen, then adjust L-bolts on adjustment plate to tighten or loosen belt(s) as needed.
3. Tighten L-adjustment bolts and the four corner bolts to lock motor in place after proper tension is reached.
NOTE
Loosen the corner bolts as minimal as possible
to allow the plate to move, but so the plate has
minimal movement when bolts are re-tightened.
L-Adjustment
Bolts
Corner
Bolts
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