Near Intersection of I-35 & I-90 Southern Mn. | You ask if you should change the valve. Personally I would although the Servo valve could work for you. The plumbing would be basically the same but the layout would depend on whether you plan on using a single set (pair) of hoses or if you plan on using two sets.
Method 1: If using one set, the pressure hose from the tractor would go to the IN port of the bed valve. The CF (controlled flow) port would go to the bed motor. The EX (excess) port would have a hose that tees with the output port of the bed motor. Thus the oil flow is split between the CF and EX ports but rejoins past the bed motor. There the rejoined flow could go to the IN port of the spinner motor. The OUT port of the spinner motor(s) would return the oil back to the tractor. This was the PWM valve would control the bed speed by splitting the incoming flow. All that oil would go to the spinners. The speed of the spinners would be controlled by the hydraulic setting on the tractor (this is assuming a modern tractor with a flow control system of its own).
A spinner speed sensor could be added so that the Ag Leader would display but not control the spinner speed. You would adjust the spinner speed yourself.
Method 2: More deluxe. Same as #1 above but have a second PWM valve prior to the spinner motor. This would also require a spinner speed sensor. The spinner PWM valve would also be controlled by the Ag Leader. The advantage to this approach although more expensive is that the Ag Leader would control both the bed and spinner speed. The operator would have the ability to change both through the Ag Leader display.
I recommend drawing this out on paper before you start rearranging things.
Another approach would be to use two SCVs on the tractor and keep the bed and spinner systems separate. Then the bed PWM valve would not need to use the EX port and it would just be plugged. The pressure would come into the PWM valve and leave out the CF port to the bed motor, the OUT from the bed motor would return straight back to the tractor. As far as the spinner is concerned, the other pressure hose from the tractor could go straight to the spinner motor IN port and back OUT to the tractor. A spinner speed sensor or another PWM valve could be used for it as described above.
Edited by tedbear 11/6/2025 09:17
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Converting AgLeader driven spreader to Greenstar Dry controller
