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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.
Corner
Bolts
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.
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.
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
®
L-Adjustment
Bolts
⁄
1
⁄
- 1
⁄
1
⁄
- 2
⁄
2
⁄
5
7
15
3
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
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.
• 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
- 3
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.
NOTE
Universal Single Width Fans
17
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