My Cockshutt 30 had an aftermarket propane system. Propane delivery out here is a pain at best, so I used a BBQ tank. IIRC I bought an adapter that let me plumb into the supply line to the mounted tank and I could hang a 20lbs BBQ tank off the side of the tractor. I used nothing but the new style tanks with the safety valve, but I had to open the tank valve with the supply line to the tractor closed and let the pressure equalize or whatever it does and then after 30-45 seconds I could open the tractor side. I have to do the same thing with my big propane weed burner or the tank valve locks up. Never had a problem after that.
Mind you, this is a 30 hp tractor. Your 4020 might need more flow than the BBQ tank can supply, but considering the flame out of my weed burner, I think it should at least be able to move around the yard.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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