How to Select a Drive

How to Select a Drive

The following information is necessary to make proper selection:

• Horsepower requirement
• Input and output r.p.m.
• Service Factor
• External thrust
• Is a hollow or solid output shaft required?
• Is a non-reverse required?
• What is the shaft rotation?

1. Divide input r.p.m. by output r.p.m. to find the required gear ratio.
2. Select the closest ratio from the POWER AND THRUST RATINGS table.(from the previous Large Right Angle Pump Drives page)
3. Proceed down the ratio column until the required horsepower rating is found under the pump r.p.m. (Interpolate as required for intermediate rating.) NOTE: All ratings listed in this catalog include a 1.5 service factor. In the event a service factor other than 1.5 is required, divide 1.5 by the required service factor and then multiply the results by the table rating to get the drive rating with the new service factor.
4. Check thrust capacity of your selection to verify that it is equal to or less than the rating. (If your requirement is greater than the rated value, contact our factory.)
5. Verify the rotation with drawings in the POWER AND THRUST RATINGS table.

   Model Prefix Definition
   	Hollow	Solid
   	Shaft	Shaft
   Standard Thrust	SL	SSL
   Heavy Thrust	S	SS
   Extra Heavy Thrust	SH	SSH

NOTE: All thrust ratings listed are for continuous service. Higher thrust loads are allowed for intermittent service or momentary operation conditions. Our experienced sales staff is ready to assist you at all times in making a final selection.

Example: A solid shaft right angle gear drive is to connect a diesel engine transmitting 1200 hp at 1800 r.p.m. and a vertical pump at 720 r.p.m. A 1.5 service factor is required and the pump will develop 15,000 lb. downthrust at duty.

1800	=	2.5 (Ratio Reduction)
720

The POWER AND THRUST RATINGS table shows that the Model 1500 2.5:1 rates 1079 hp at 720 r.p.m. and the Model 1800 2.5:1 rates 1634 hp at 720 r.p.m. The correct selection is then the model 1800. The SSL thrust bearing rating exceeds the pump thrust, therefore, the model number would be SSL1800 2.5:1 ratio.