Near Intersection of I-35 & I-90 Southern Mn. | Another possibility with the Ag Leader or any control system is an incorrect choice of the control valve type and setting.
Some rigs use a butterfly valve in the product line. Sometimes it is in the main line which is referred to as inline or throttling control. Sometimes it is placed off of a Tee which allows excess to return to the tank. This type of control is referred to as by pass control. The control valve must operate in a reverse fashion for one versus the other. The configuration for the control valve allows the operator to pick the correct choice.
Some rigs use a hydraulically driven spray pump. Control may be handled by varying the flow of oil to the pump. Sometimes this is done with a hydraulic Servo valve. Other times it is down with a PWM hydraulic valve.
It is quite easy to check the operation of the butterfly type valves. These valves have a pair of limit switches in them that can fail
If they are working properly the motor should slowly move the butterfly toward fully open or fully closed. Fully open is not straight open but only about 80 degrees open. Fully closed is straight across to block the flow. It should take 8 seconds for the butterfly to move from one extreme to the other.
This can be tested by listening to the valve. This often takes two people with the engine off and a reasonably quiet location. The person at the Ag Leader display should put it in Manual control and push and hold the UP button on the slide out screen on the right side of the display. The other person should stand close to the control valve and listen to it. Once the person in the cab pushes the UP button and holds it, the motor may start running (making noise) and eventually stop. It may not start if it happened to be at the fully open or fully closed position.
In either event, have the person push and hold the DOWN button. The motor should start and run for 8 seconds and then stop. Have the person push and hold the UP button a second time. This time since the limit had been reached, the motor should run for 8 seconds and then stop. If this behaves in the fashion then the control valve is likely healthy. There is the unlikely event that the shaft turning the butterfly or the butterfly itself has broken. Removing the control valve and observing the movement or lack of movement could then be observed.
Edited by tedbear 3/23/2024 08:58
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Issues regarding Raven flow meter calibration
