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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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