Great Plains CDS-JohnBlue NGP Series Pumps User Manual
Page 7
© 2013 CDS-John Blue Co.
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LOADED RADIUS
The measurement for the loaded radius must be from the Manufacturer of the tire or be measured under loaded
conditions. The loaded radius tire is always the tire that has the first drive sprocket attached to its hub.
Ground Wheel Drive Arrangement
Measure the loaded radius from the center of the hub to the bottom of the
tire where it rests on the ground.
Press Wheel Drive Arrangement
Measure the loaded radius from the center of the press wheel shaft to
where the wheel rests against the tire. The press wheel must be engaged
for normal operation to give an accurate reading.
SWATH WIDTH
To determine the swath width, count the number of outlets and multiply by
the distance (inches) between any two outlets, nozzles, or shanks. This
assumes that all outlets are equally spaced, if outlets are not evenly
spaced, figure the entire length of the boom or toolbar from end nozzle
to end nozzle and allow for coverage beyond the ends.
For example, an 11 row boom at 30” would have a swath width of 330”
SETTING THE PUMP
Read the desired pump setting from the bottom scale on the pump setting chart. Loosen the setting pointer nut
and rotate the setting hub until the setting pointer is over the desired setting. The setting wrench will facilitate
rotation of the setting hub. Once proper pump setting is achieved, tighten the setting pointer nut.
EXAMPLE:
An applicator is equipped with a NGP-6050 series pump, 11L x 15” tires, a 60 tooth drive sprocket, and a 16
tooth pump driven sprocket. It is desired to apply 33 gallons per acre on a 360” swath. The following steps will
determine correct pump setting:
1. Set loaded radius of tire (13.5”) under the sprocket
combination of 16 to 60 in the top window.
2. Set the swath width (360”) under the diamond in the middle
window.
3. Read that the pump setting is approx. 9 at 33 gallons per
acre on the NGP-6055 scale in the bottom window.
4. Set the pump to setting 9 to achieve 33 gallons per acre
Note: The max. ground speed is read above the diamond as
approx. 9 mph to avoid exceeding 450 pump rpm.
SET SWATH WIDTH
AT DIAMOND
READ PUMP
SETTING
SET LOADED RADIUS
AT SPROCKET RATIO
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