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It is very important that the drive pulleys remain in proper
alignment after adjustments. (Fig. 3)
When replacing belts, always use the same size and type
as originally supplied by the factory. Check pulleys for
wear and replace both pulleys and belts if wear is evident.
Misalignment of pulleys will result in premature belt and
bearing failure, noise and loss of fan efficiency.
Fan Bearing Lubrication - The bearings are carefully
selected to match the maximum load and operating
conditions of the specific class, arrangement and fan size.
The instructions provided in this manual and those provided by the bearing manufacturer will minimize any bearing
problems. Bearings are the most critical part of the fan. Therefore, special care is required when mounting them on
the unit and maintaining them.
Refer to the following charts and the manufacturer's instructions for grease types and intervals for various operating
conditions. Never mix greases made with different bases. This will cause a breakdown of the grease and possible
failure of the bearing.
Standard Grease
Recommended Fan Bearing Lubrication Schedule
Relubrication Schedule in Months
Fan
1 1 ⁄8 -
1 5 ⁄8 -
RPM
1 ⁄2 - 1
1 1 ⁄2
1 7 ⁄8
To 250
12
12
12
500
12
12
11
750
12
9
8
1000
12
7
6
1250
12
6
5
1500
12
5
4
2000
12
3
3
2500
12
2
2
3000
12
2
1
3500
12
1
.5
4000
12
.5
.25
5000
12
.25
# of
4
8
8
Shots**
* Lubricate 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 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.
•
Storage periods of 3 months or longer require monthly rotation of the shaft and purging grease prior to storage
and start-up.
Lubricate bearings prior to periods of extended shutdowns or storage and rotate shaft monthly to aid in preventing
corrosion. If the fan is stored more than three months, the bearings should be purged with new grease prior to
start-up.
®
Bearing Bore
1 15 ⁄16 -
2 7 ⁄16 -
3 3 ⁄ 16 -
3 15 ⁄16 -
2 3 ⁄16
3 1 ⁄ 2
3
12
12
12
10
8
7
7
6
4
5
4
3
4
3
2
3
2
1
2
1
0.5
1
0.5
0.25
0.5
0.25
.25
10
16
25
Belt Span
Belt Span
Fig. 3
Recommended Fan Bearing Lubrication Schedule
Relubrication Schedule in Months
CORRECT
CORRECT
WRONG
Fan
1 ⁄2 - 1
RPM
4 1 ⁄2
10
To 250
12
500
12
5
750
12
3
1000
12
2
1
1250
12
0.75
1500
12
2000
12
0.25
2500
12
3000
12
3500
12
4000
12
5000
12
# of
41
4
Shots**
IMPORTANT
CORRECT
CORRECT
WRONG
WRONG
Synthetic Grease
WRONG
WRONG
WRONG
Bearing Bore
1 1 ⁄8 -
1 5 ⁄8 -
1 15 ⁄16 -
2 7 ⁄16 -
1 1 ⁄2
1 7 ⁄8
2 3 ⁄16
3
12
12
12
12
12
11
10
8
9
8
7
6
7
6
5
4
6
5
4
3
5
4
3
2
3
3
2
1
2
2
1
0.5
2
1
0.5
0.25
3
2
.75
2
.5
1
8
8
10
16
Tubular Inline Fans
WRONG
WRONG
WRONG
WRONG
WRONG
WRONG
3 3 ⁄ 16 -
3 15 ⁄16 -
3 1 ⁄ 2
4 1 ⁄2
12
10
7
5
4
3
3
2
2
1
1
0.75
0.5
0.25
0.25
25
41
9
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