Liquid Fertilizer-Piston Pump System

Symptom Problem Solution

Pump hard to prime or

Leak in suction hoses.

Check plumbing for leaks. Tighten and seal where needed.

Open special fitting check valve.

See "Priming and Initial Start up of Pump".

Pump won't prime.

Strainer plugged.

Clean strainer.

Pump set too low.

Set pump according to rate chart.

Pump valves fouled.

See your John Deere dealer.

Packings worn.

See your John Deere dealer.

Pump metering low.

Leak in suction hoses.

Check plumbing for leaks. Tighten and seal where needed.

Open special fitting check valve.

See your John Deere dealer.

Strainer plugged.

Clean strainer.

Pump set too low.

Set pump according to rate chart.

Pump valves fouled.

See your John Deere dealer.

Pump drive set wrong.

Set drive according to rate chart.

Broken valve spring.

-

Pump metering high.

Pump set too high.

Select pump number according to rate chart or adjust upward due to low drive wheel slippage.

Pump drive set wrong.

Set drive according to rate chart.

Valve stuck open.

See your John Deere dealer.

Broken valve spring.

See your John Deere dealer.

Contaminates under valve.

See your John Deere dealer.

A54964.230AA -19-29APR98-1/2


Symptom Problem Solution

Fertilizer leaks past pump when pump is stopped.

Incorrect orifice used.

-

Valve stuck open.

See you John Deere dealer.

Broken valve spring.

See your John Deere dealer.

Leaks between pump and crankcase.

Rod packing worn.

See your John Deere dealer.

Pump using excessive oil.

Oil seals worn.

See your John Deere dealer.

O-rings leaking.

See you John Deere dealer.

Pump operates noisily.

Pump components worn.

See your John Deere dealer.

Fertilizer leaks at opener when planter stopped.

Check valve malfunctioning.

Repair or replace check valve.

Excessive cleanout of main strainer required or type of fertilizer used plugs screen.

Main and row strainer mesh too fine.

Use courser mesh screens. See "Strainer Maintenance" section.

Liquid fertilizer tank will not fill.

Drip line or cap fitting plugged.

Clean. See "Cleaning Liquid Fertilizer Tank" in Service Section.

CAUTION! Do not service if system is under pressure.

Fertilizer manifold pulsates or shakes.

Incorrect orifice used.

Install correct orifice.

Main and/or row strainer plugged.

Clean strainer.

A54964.230AA -19-29APR98-2/2