Great Plains CDS-JohnBlue NGP Series Pumps User Manual

Page 7

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