The solenoid windings themselves are interchangeable. The linkage varies. Early versions had no plunger inside the windings and later ones do. The plunger models seem more prone to getting debris stuck into them and jamming.
The solenoids have no mechanical connection to shut off anything. When turned "on" they force the linkgage to just get out of the way - and a spring pulls the pump's metering valve into "run." So at times solenoids get blames when not the real problem.
Often stuck linkage is the problem. And if the solenoid winding seems shorted it likely just has bad insulator bushings (easy and cheap to fix).
I put a shut-off solenoid winding from a 1982 Chevy truck into a Case 580CK backhoe pump with no problem. Same with a Deere 300B. The Case 188 originally had mechanical shut-off and I converted it to electrtic.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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