Classes of Service

The industrial ratings for parallel shaft drives are based on AGMA Class 1 service conditions. A 1.00 service factor is used when the application is free from recurrent shock loading and is continuous but does not exceed 10 hours per day. For other operating conditions, the application horsepower and torque requirements is computed by multiplying the actual or specified value, by the appropriate service factor. It is recommended that the unit selected have a capacity equal to or in excess of this equivalent load.

SERVICE FACTORS FOR PARALLEL SHAFT DRIVE MODELS
Prime Mover Duration of Service Driven Machine Load Classification
Uniform Moderate Shock Heavy Shock
Electric Motor Occasional 1/2 Hour per day
Intermittent 3 Hours per day
Up to 10 Hours per day
24 Hours per day
*
*
1.00
1.25
*
1.00
1.25
1.50
1.00
1.25
1.50
1.75
Electric Motor
with Frequent
Starts and Stops
Occasional 1/2 Hour per day
Intermittent 3 Hours per day
Up to 10 Hours per day
24 Hours per day
*
1.00
1.25
1.50
1.00
1.25
1.50
1.75
1.25
1.50
1.75
2.00
Multi-Cylinder
Internal
Combustion
Engine
Occasional 1/2 Hour per day
Intermittent 3 Hours per day
Up to 10 Hours per day
24 Hours per day
*
1.00
1.25
1.50
1.00
1.25
1.50
1.75
1.25
1.50
1.75
2.00
Single Cylinder
Internal
Combustion
Engine
Occasional 1/2 Hour per day
Intermittent 3 Hours per day
Up to 10 Hours per day
24 Hours per day
1.00
1.25
1.50
1.75
1.25
1.50
1.75
2.00
1.50
1.75
2.00
2.25


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