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OPERATION & MAINTENANCE
MANUALS

Pump Drive
Drive Shaft
A Series
Fan Drive
Fan Drive (French)


Amarillo Gear Co.
 P.O. Box 1789
2401 Sundown Lane
 Amarillo, Texas 79105
Phone - (806) 622-1273
Fax - (806) 622-3258

 

 





 Parallel Shaft Gear Drive Selection



Having a gear drive specifically designed for dry cooling systems and steam condensers means the process for selecting the correct gear drive is simple. It's as easy as following the 5 steps shown below. For unusual applications or extreme operating conditions, contact Amarillo Gear Company's Engineering Department for help making the correct selection.

1. Calculate the required ratio by dividing the motor speed (input) by the fan speed (output).
2. Select a gear drive from Table I or II that has a power rating, under the required ratio column, that is equal to or greater than the motor power at the motor speed. Use Table I for Horsepower ratings and Table II for Kilowatt ratings. All ratings include a 2.0 service factor recommended by Amarillo Gear Company for gear drives used in cooling tower fan service.






3. Use the exact ratio found in Table III, to compute your actual fan speed. All ratios are within 2% of the nominal ratio.



4. The down thrust capacity of Amarillo Parallel Shaft Drives exceeds the requirements for most applications.
If the total of the fan weight and fan thrust is greater than shown in Table IV, other bearing selections are available.
Contact Amarillo Gear Company's Engineering Department for information.



5. Amarillo Parallel Shaft Drives are designed to ensure that the thermal rating meets or exceeds the service rating in Tables
I and II when the ambient temperature is 120 degrees F or less. No thermal calculations are required. For rare applications where the
ambient temperature is above 120 degrees F, contact Amarillo Gear Company's Engineering Department for thermal ratings for your
specific project conditions.