Malfunctions

IMPORTANT: If malfunctions recur regularly, this may indicate a basic fault in the machine: inform your dealer!

Maintenance of the machine can be carried out by the operator, as well as replacement of simple parts, such as:

• filters
• hoses
• nozzles
• nozzle holder diaphragms

Repair of moving parts such as the pump and electrical valves must always be carried out by an official John Deere dealer.

The pump has no suction power

One or more valves are not correctly sealed or leaking.

Check the valve seat and clean it.

The pressure gauge shows sudden changes

The pump sucks in air or is not properly de-aerated.

Check suction lines. Run the pump with closed master valve (by-pass) in order to prime the pump.

The pump outlet is irregular

The accumulator (air chamber) is empty.

Fill the accumulator with sufficient air pressure.

The pump gives enough water but not enough pressure

The seals of the pressure regulator are worn.

Replace seals and possibly also the valve seats.

The pump yield is reduced and the pump is noisier

The oil level is too low.

Top up the oil.

There is an oil leak

One or more diaphragms are damaged.

Drain off the oil and dismantle the cylinder head to replace the damaged diaphragms. Replace the oil.

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If the section valves cannot be operated with Master switch, check the position of the selection switch (SW1) on the printed circuit board.

• The switch must be in the lower position for conventional sprayers (without vacuum recirculation system).
• The switch in upper position is only used on sprayers equipped with VRS (vacuum recirculation system; not available on 700 Series sprayers).

A-Printed Circuit Board
B-Selection switch (SW1) Conventional sprayer / VRS

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