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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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