V-Belt Replacement
The
in unsafe operating conditions which may cause personal injury or failure of fan components.
1.Remove the protective coating from the end of the fan shaft using mineral spirits or another similar solvent. Check to ensure that the shaft is free of nicks and burrs.
2.Slide sheaves on shafts. Do not drive sheaves on as this may result in bearing damage.
3.Align fan and motor sheaves with a
and tighten.
4.Place belts over sheaves. Do not pry or force belts, as this
could result in damage to the cords in the belts.
5. Adjust the tension until the belts appear snug. Run the unit for a few minutes (refer to
unit
6.With the fan off, adjust the belt tension by moving the motor pivot plate. (Belts are adjusted by raising or lowering the motor pivot plate). When in operation, the tight side of the belts should be in a straight line from sheave to sheave with a slight bow on the slack side.
Motors
Motor maintenance is generally limited to cleaning and lubrication. Cleaning should be limited to exterior surfaces only. Removing dust and grease
CAUTION
Do not allow water or solvents to enter the motor or bearings. Under no circumstances should motors or bearings be sprayed with steam, water or solvents.
Greasing of motor bearings is only required when fittings are provided. Many fractional motors are permanently lubricated and require no further lubrication. Motors supplied with grease fittings should be greased in accordance with the manufacturer’s recommendations. When motor temperature does not exceed 104ºF (40ºC), the grease should be replaced after 2000 hours of running time.
Fan Bearing Lubrication
The bearings for Greenheck fans 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 moving part of the fan. Therefore, special care is required when mounting them on the unit and maintaining them.
Refer to the following chart 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.
Recommended Fan Bearing Lubrication Schedule (in Months*)
Fan |
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| Bearing Bore |
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| ||
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| |
RPM | 1 | ⁄2 | - 1 | 1 | 1 | 5 | 7 | 115⁄16 |
| 27⁄16 | 33⁄16 | 315⁄16 |
|
| 1 ⁄8 - 1 ⁄2 | 1 ⁄8 | - 1 ⁄8 | - 23⁄16 |
| - 3 | - 31⁄2 | - 41⁄2 | |||
To 250 |
|
| 6 |
| 6 |
| 6 | 6 |
| 6 | 5 | 4 |
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500 |
|
| 6 |
| 6 |
| 6 | 5 |
| 4 | 3 | 3 |
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750 |
|
| 6 |
| 5 |
| 4 | 3 |
| 3 | 2 | 2 |
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1000 |
|
| 6 |
| 4 |
| 3 | 2 |
| 2 | 1 | 1 |
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1250 |
|
| 5 |
| 3 |
| 2 | 1 |
| 1 | 0.5 | 0.5 |
|
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1500 |
|
| 5 |
| 2 |
| 1 | 1 |
| 0.5 | 0.5 | 0.25 |
|
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2000 |
|
| 5 |
| 1 |
| 1 | 0.5 |
| 0.25 | 0.25 | 0.25 |
|
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| |
2500 |
|
| 4 |
| 0.5 | 0.5 | 0.25 |
| 0.25 | 0.25 |
| |
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| |
3000 |
|
| 4 |
| 0.5 | 0.25 | 0.25 |
| 0.25 |
|
| |
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*Suggested initial greasing interval is based on 12 hour per day operation and 150º F. maximum housing temperature. For continuous (24 hour) operation, decrease greasing interval by 50%.
•If possible, relubricate with grease while in operation without endangering personnel.
•For ball bearings (operating) relubricate until clean grease is seen purging at the seals. Be careful not to unseat the seal by over lubricating.
•For ball bearings (idle) add
•For roller bearings, relubricate with 4 shots of grease up to 2 in. bore size, 8 shots for
•Adjust lubrication frequency based on condition of purged grease.
•A high quality lithium base grease conforming to NLGI
Grade 2 consistency, such as those listed below, should be used.
Mobilith SHC 220 | Texaco Multifak AFB2 |
Mobilith AW2 | Texaco Premium RB |
Shell Alvania #2 | Exxon Unirex N2 |
WARNING
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
6 Model TCF and Models QEI/QEID Centrifugal
®