Operation of Hydraulic Functions

IMPORTANT: The maximum permissible hydraulic system pressure is 200 bar.

The hydraulic functions of the sprayer are operated by (depending on type of equipment):

• the tractor selective control valves directly.
• the tractor selective control valves by means of a hydraulic selector control box (EHS-1)
• electro-hydraulically (with EHB-1 or EHB-2 control box)

NOTE: After disconnecting the hoses, always install protective caps (A) on the couplings to prevent contamination which can damage the hydraulic system.

In case of machines hydraulically operated via the tractor selective control valves, the following tractor selective control valves are required:

• 1 single-acting selective control valve for hydraulic boom height adjustment
• 1 double-acting selective control valve for spray boom folding/unfolding
• 1 double-acting selective control valve for boom tilt

In case of machines hydraulically operated via the tractor selective control valves in combination with the hydraulic selector box (EHS-1), the following tractor selective control valves are required:

• 1 single-acting selective control valve for hydraulic boom height adjustment

• 1 double-acting selective control valve for all spray boom functions

With the hydraulic selector box, the operator can select the hydraulic function to be controlled with one double-acting selective control valve of the tractor:

• boom folding

A-Protective cap
B-Park position of hydraulic hoses

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• boom tilt

• boom folding tips

Electrically controlled check valves (normally closed, NC) direct the oil flow from the double-acting selective control valve of the tractor to the selected cylinder(s).

In addition the following tractor selective control valve is needed for optional equipment:

• 1 double-acting selective control valve for hydraulic drawbar steering

After disconnecting the hoses, always install protective caps on the couplings to prevent contamination.

IMPORTANT: If oil is pumped through the electro-hydraulic control valve(s), the (EHB-1 or EHB-2) control box must always be switched on to avoid overloading.

The electro-hydraulic operation system enables operation of all hydraulic sprayer functions via an electrical control box (EHB-1 or EHB-2) in the tractor cab. For this purpose an electro-hydraulic control valve block is mounted on the sprayer, with one single-acting and at three up to seven double-acting control valves, depending on the version. In addition, a so-called OC/CC valve is fitted to the electro-hydraulic control valve block.

The electro-hydraulic control valve(s) are suitable for both closed centre tractor hydraulics (continuous pressure system) and open centre tractor hydraulics (continuous volume system). The electro-hydraulic control valve(s) are suitable for tractors with a pump capacity of up to 50 l/min.

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NOTE: The flow rate to the electro-hydraulic control valve block needs to be restricted to 50 l/min.

The control valve block is fitted with a combined flow control valve and safety valve (set to 180 bar). All electro-hydraulic control valves are fitted with controlled non-return check valves to prevent drifting of the hydraulic cylinders.

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The electro-hydraulic system on the sprayer needs to be adjusted according to the hydraulic system on the tractor.

The correct hydraulic system has to be be selected by fitting or removing a connector (B) on position J26 on the printed circuit board in the receiver box (A) of the sprayer.

A-Electro-hydraulic receiver box
B-Connector position J26 at printed circuit board (example shown with connector fitted for OC single grey cable connected)

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A-Hydraulic system on printed circuit board
B-Connector (B) with single gray cable (GS) for OC system fitted on position (E) = (position J26 on printed circuit board)

C-No connector fitted for CC system on position (E) = (position J26 on printed circuit board)

D-Connector (D) with brown (BR) and white (WT) or blue (BL) cable for the optional LS system fitted on position (E) = (position J26 on printed circuit board)

E-Position J26 on printed circuit board

An electrical wiring diagram is also present in the electro-hydraulic receiver box. Refer also to "Colour Codes according to DIN 47100" in the section "Specifications".

• If tractor is equipped with "Open Center Hydraulics" (OC), connector (B) with a single grey cable needs to be fitted on position (E), which corresponds to position J26 on printed circuit board.
• If tractor is equipped with a Closed Center or Continuous pressure system (CC), there may be no

connector installed at position (E), which corresponds to position J26 on printed circuit board.
• If tractor is equipped with Load Sensing Hydraulics (LS), connector (D) with a brown (BR) cable on one side and a white (WT) or blue (BL) cable on the other side needs to be fitted on position (E), which corresponds to position J26 on printed circuit board.

A manual valve near the flow divider on the front side of the machine has to be adjusted. Refer to "Adjustment of Hydraulic Flow Divider" in this section.

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When using open center hydraulics, the flow divider (A) should be completely open. Turn the regulating valve (B) counter-clockwise to open the valve.

When using closed center hydraulics, the flow divider (A) should be completely closed. Turn the regulating valve (B) clockwise to close the valve.

When using load sensing hydraulics, the flow divider (A) should be completely closed. Turn the regulating valve (B) clockwise to close the valve.

The control valve block is fitted with a delivery and return line with quick release couplings. After disconnecting the hoses, always install protective caps on the couplings to prevent contamination. The tractor must be equipped with a delivery connection and a pressureless return. The delivery connection is provided with a red protective cap; the return line is provided with a blue protective cap. The flow devider is located underneath the platform.

A-Flow Divider
B-Regulating Valve

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A-Pressure connection "P" with red protective cap
B-Manually operated valve (only if load sensing kit is available)
C-Pressure-free return "T " with blue protective cap
D-Load sensing connection "LS" with yellow protective cap

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When the tractor is equipped with power beyond couplers connect the load sensing system from the sprayer to the tractor. See also Tractor Operator's Manual. The hydraulic oil pressure and volume will be adjusted to the machines requirements. The pressure connection "P" (red protective cap) needs to be connected to the tractor's power beyond connection. The return line "T" (blue protective cap) must be connected to the tractor's pressure-free return. The load sensing male connection "LS" (yellow protective cap) needs to be connected to the tractor's load sensing connection.

IMPORTANT: For transport, the load sensing line should always be closed using the manually operated valve. If the handle is in vertical position, the valve is open.

NOTE: Due to differences in the outside temperatures the viscosity of the oil can be different when starting work. With a low oil viscosity it can occur that the hydraulic functions cannot be operated immediately when starting the tractor. This problem is solved when the viscosity (temperature) of the oil is increasing.

A-Pressure connection
B-Return connection
C-Load sense connection

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The electro-hydraulic control valves have been fitted with emergency manual controls. This allows for operation of the necessary functions to fold the boom in transport position by using a pen or screwdriver in the case of electrical problems. One or two valves (A) must be operated simultaneously for this purpose, namely:

• the control valve of the function in question
• the control valve of the OC/CC valve (only on tractors with an OC hydraulic system)

To operate the electro-hydraulic valves via the emergency manual control first remove the protective caps (A). The manual operation of the height adjustment can be done by removing the clip (C), other functions can be activated by using a pen or screwdriver.

Tractors with an OC hydraulic system do not generate pressure until the OC/CC valve is in operation. This can also be done by disconnecting the plug from the coil of the OC/CC valve.

Stickers have been attached to the cables to the various magnetic coils to indicate the function in question. The symbols correspond with the symbols used on the control box. The meaning of the function in question is described in "Control Box" in section "Operation of the Machine". In addition, the various functions of the control valves can be found on the electrical control diagram provided in the receiver boxes of the machine.

A-Protective caps of electro-hydraulic control valve
B-Emergency manual operation of electro-hydraulic control valve for boom height adjustment
C-Clip
D-Emergency manual operation of electro-hydraulic control valve

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