Adjusting The Automatic Tracking System With Steering Drawbar

After the crop sprayer has been connected (see section "Coupling and Uncoupling of the Sprayer"), the following procedure must be followed to adjust the automatic tracking system on the steering drawbar. The spray booms must be unfolded, otherwise operation of the steering drawbar is not possible:

• Disconnect the steering rod (D) with pin joints from the tractor.
• Manually position the drawbar at right angles to the axle of the sprayer.
• Move the tractor in front of the sprayer, thus putting the drawbar at right angles to the rear axle of the tractor as well. Switch off the tractor.
• The pivoting plate (A) of steering actuator with pin joints must now be attached to the tractor by fixing it to the separate sleeve with pivot. The steering rod (threaded rod D) must be cut to the correct length for this purpose.
• The sensors (B) are adjustable in the slotted holes. Their adjustment can be checked by means of the LEDs (E) on the sensors when the control box is switched on. The LEDs on the sensors must not be ON if the drawbar is in straight line behind the tractor. However, as soon as the pivoting steering actuator plate steers slightly forward or backward, the left or right LED must immediately light up. The vertical distance between the sensors and the actuator plate must be 5-6 mm.
• Manually drive out the drawbar completely to the left. If the operation is set to auto, the drawbar should now automatically position itself at right angles to the rear axle.
• Manually drive out the drawbar completely to the right. If the operation is set to auto, the drawbar should again automatically position itself at right angles to the rear axle.

A-Pivoting plate
B-Sensors
C-Bolts
D-Steering rod with pin joints
E-LED (indicator light)

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The steering cylinder is fitted with fixed restrictors with a diameter of 1.0 mm on the rod side of the cylinder and a diameter of 1.2 mm on the piston side of the cylinder. The restrictors have been set to an average driving speed of 4-6 km/h when turning. When oil flow at restrictors is increased, the system may turn unstable, because the cylinder operates at too large steps and as a result the "zero point" is never reached.

The machine can be equipped with a single or double steering cylinder with adjustable restrictors. The restrictors allow adjustment of the steering to different turning speeds. The cylinders are located unterneath the machine.

• If the restrictors are turned clockwise, the oil flow will increase
• If the restrictors are turned counter-clockwise, the oil flow will decrease

All restrictors on the machine need to be adjusted. The recommended speed when turning at the headland is 4-6 km/h.

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