Greenheck Fan Model SWB Series 300 Blower Maintenance Belt Drive, Wheel and Fastener Maintenance

Blower Maintenance (Belt Drive)

Belts tend to stretch after a period of time.. They should be periodically checked for tension and wear.. When replacing belts, use the same type as supplied with the unit.. Replacement of belts should

be accomplished by loosening the tensioning “L-Bolts” so the belts may be removed by hand.. Do not force belts on or off as this may cause breakage of cords and lead to premature belt failure..

Belt tension should be adjusted to allow 1/64 in.. of belt deflection per 1 in.. of belt span.. For example, a 16 in.. belt span should have 16/64 in.. or 1/4 in.. of deflection with moderate thumb pressure at mid-point between the pulleys.. (Fig.. 3).. Refer to Greenheck’s Product Application Guide, “Measuring Belt Tension” for additional information—FA/127-11 found online at www..greenheck..com under the library section..

Fig. 3
	Belt Span

Deflection = Belt Span 64

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

Fan		Bearing Bore, inches
RPM
	1⁄2 -1	11⁄8 - 11⁄2	15⁄8 - 17⁄8	115⁄16 - 23⁄16	27⁄16 - 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	4	8	8	10	16
of Shots

6Centrifugal Utility Fans

•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..

Motor Maintenance (Belt & Direct Drive)

Motor maintenance is generally limited to cleaning and lubrication (where applicable).. Cleaning should be limited to exterior surfaces only.. Removing dust and grease buildup on the motor housing assures proper motor cooling.. Use caution and 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..

Many fractional horsepower motors are permanently lubricated for life and require no further lubrication.. Motors supplied with grease fittings should be greased in accordance with the manufacturer’s recommendations..

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..

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