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Coles County, Illinois | I had 18" of all the wires (6) insulation eaten way and it still kinda worked.
Here is a post from earlier:
I just got done replacing about 18" of wiring on each of the wires going to the Dial-a-matic box on the side of the head. The problem was where the wire goes over the feederhouse.The wire was still there but mice had eaten all the insulation off the wires. I will say that it acted spooky at times but generally worked until the last field last year. We ran it by the ball to finish up. The symptom was the head would raise until the chain switch shut it off. Haven't used the head yet but it works well sitting by the shop after the repair.
Some things I believe to be true that may not be obvious. The control wiring is on a isolated power supply. I didn't find one but I assume it's in the "Black Box" with the big transistors mounted on the combine. With as much exposed wire I replaced, the wires had to be touching the head's frame but no fuse blew or wire melted. I had also tried to tap into the chain switch to enable painting on my Envizio Pro but that didn't work. An isolated power would explain this as the signal would not have a reference to the same ground as the Envizio Pro. The 3 transistors on the "Black Box" do the switching and power the raise and lower solenoids. One is up, one is down and the third is to the chain switch that turns the power supply on. By using transistors to do the switching Deere avoided arcing down at the box on the head with the traces and the wiper.
Solid state switches and an isolated power supply complicates the trouble shooting of this system | |
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JD 920 Dial-a-matic troubleshooting
