Great Plains CDS-JohnBlue NGP Series Pumps - Manual (Page 6)

© 2013 CDS-John Blue Co. 6
PUMP SETTING
The NGP pump output is determined by the drive sprocket ratio and the stroke setting. There are two ways to
find the proper setting for your pump:
1. Using the online flow rate calculator at www.cds-johnblue.com .The icon is on the
right-hand side of the page, and there is a mobile version available here:
2. Using the slide chart (115698-91) supplied with the pump – follow the example below:
SPROCKET RATIO
Standard Sprocket Combinations
Standard sprocket combinations may be used for equipment with only one chain from the ground or press wheel
sprocket to the pump sprocket. For example: an applicator with a 60 tooth drive sprocket on the tire driving a
16 tooth driven sprocket on the pump can use the 16 to 60 mark on the slide chart.
Non-Standard Sprocket Combinations
If you are using sprocket combinations with multiple sprockets, such as with a jack shaft, use the following
formula to determine sprocket ratio:
For example: an applicator with a 50 tooth on the drive wheel, driving to a 24 tooth on the jack shaft, then a 36
tooth on the jack shaft driving up to a 16 tooth pump driven sprocket, would yield a 4.69 drive ratio.
Set the sprocket ratio on the slide chart using the 4.69 calculation for the example above.
Drive Sprocket
Driven Sprocket
= Sprocket Ratio
X X = = 4.69 Sprocket Ratio
50 T (@ Drive Wheel) 36 T (@ Drive Shaft) 50 36
24 T (@ Driven Shaft) 16 T (@ Driven Pump) 24 16
SPROCKET
RATIO LOADED RADIUS STANDARD SPROCKET
COMBINATIONS
SWATH WIDTH PUMP SETTING
GALLONS PER ACRE
MAXIMUM
GROUND
SPEED