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Discussion Starter #1
I am having trouble adjusting my concave. The actuator earlier this spring would open the concave, but not close it. Bought a new $737.00 actuator and that wasn't the problem. Checked the voltage on both wires feeding the actuator. Both are putting out 13.35 volts. Had the motor on the old actuator checked out and it is fine. Tried wiring around the connector for the wires. The connector is just fine. I made sure the concave is freed up. it moves very easily. After messing with it the other day it will now close but not open. Just the opposite of what it had done all spring. When someone was in the cab pushing the switch to open, I could hear the motor start to move, but would fail repeatedly. Do I have a ground problem? Do I need a new switch? I am about ready to pull my hair out from frustration. It is all I have left to do before wheat harvest and I plan to start later this week.

Thanks for all help.
 

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To check the switch exchange it with the cleaning fan or cylinder speed switch. They are identical. Also disconnect the actuator from the right-hand adjusting cam and try to move the concave manually. If it's tight, disassemble the cams and check for wear or binding. Make sure the M12 lock nut that holds the cams on the cross shaft is not too tight or it will not allow movement. Grease the contact surfaces on the cams when you reassemble.
 

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Discussion Starter #4
Found our problem today. 37 year tech from my local John Deere dealer diagnosed it as a faulty circuit board. That should be a bargain.
 

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We had the same problem, thought it was the switch and replaced relays in the grain tank for the concave. The fan would also just adjust faster but not slower. We replaced the circuit board in the grain tank but that did not help. A tech told to replace the relay under the arm rest. Cured the problem for the concave and the fan. Inexpensive fix.
 
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