Brian, the only way to find the parts you need is to find a junked tractor with them, or fabricate something to perform the same function yourself.
I've done some more looking at the 340's hydraulic system. There appears to be two different types. One is engine-driven with the pump and lines on the side of the engine. The other is transmission driven with the pump inside the tractor itself.
On the transmission-driven setup, a hose comes out one side of the tractor and goes up to the valve bank. Another hose comes out of the valve bank and goes back into the side of the tractor.
One of these hoses is pressure. If you can figure out which one, you could re-route that hose to a generic 2-spool open-center hydraulic valve with power beyond, then back into the tractor's valve bank.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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