Introduction – Great Plains CDS-JohnBlue NGP Series Pumps User Manual

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INTRODUCTION

The NGP series pump is a positive displacement variable stroke metering pump. It is specifically designed to

accurately meter liquid fertilizer solutions. The pump’s construction is of rigid thick walled cast iron cylinders

and manifolds for durability and long life. The check valves, piston, and rod are constructed of stainless steel for

improved corrosion resistance. Optionally, the pump may be purchased with stainless cylinders and manifolds.

The NGP series pump functions as a positive displacement metering device which operates in direct relation to

the ground speed through a ground drive system (model number DRV-3xxx). The application rate can be set

(covered under the “Pump Setting” section) before application begins and the GPA (gallons per acre) application

will be accurate regardless of the varying speeds of the drive mechanism.

The NGP series pump may also be used with one of our hydraulic drive kits (model number VRH-xxx-xx) to

provide variable rate application when used with one of many different control systems. The pump provides

several advantages over other types of pumps such as: suction capability from saddle tanks, stable settings that

do not vary with temperature, and proven durability and longevity.

The NGP series pump is designed to control the overall gallons of solution metered over an acre, independent

of downstream discharge pressure (120 psi max). The only function of the flow divider or row orifices in a CDS

– John Blue pump system is to divide liquid accurately row to row - not to meter the overall application rate.

Discharge Port
1-1/2” NPT

Suction Port
1-1/2” NPT

Sprocket

Oil Level Plug

Rear - Not Shown

Oil Fill Plug
Vent Plug

Oil Drain Plug

Rear - Not Shown

Packing Grease Zerk

Piston

Rod Packing

Valve Access
Cover

Suction Valves
Bottom Position
(Weak Spring,
Flat Side Out)

Discharge Valves
Top Position
(Stiff Spring,
Flat Side In)

Not Visible

Pump Setting
Hub & Pointer

Piston
Packing

Optional 220 size
Flanges Shown