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I put a lot of miles on one of those when I was a kid! I have a 1955 50 on propane now. Just to expand one something one of the guys said, you open the little thumbscrew on top of the tank, when it's full you'll see WHITE propane coming out, that's the liquid. Before that, it will be clear and just hissing loudly. When it turns white, shut it off and turn off the fill hose valve. One other thing - you'll need a propane tank with a dip tube. Tell your propane dealer what you're doing, they'll know what you need. It needs a tube going to the bottom of the propane tank so you'll get liquid instead of vapor. Start the tractor on vapor, run it for a few minutes, then turn the liquid valve on and the vapor valve off (in that order! If you turn the vapor valve off first it will die.) Run it long enough for the water to warm up a little, the idea is to let the water that runs through the propane regulator warm up so the regulator doesn't freeze up. You'll notice a water hose running to the regulator, you'll feel it get warm if you lay your hand on it. Be VERY careful with the propane! If you store it inside, you'll need to provide ventilation at ground level because it's heavier than air. It's better to have an open tractor barn or shed. Also, when you're fuelling, always wear heavy leather gloves. It's very cold and will only take a couple of seconds to get frostbite. We used to freeze cokes with it in about 10 seconds - DON'T DO THAT!!! ;-) Be careful, if you have any other questions just drop a note or post something here. Enjoy the 720, it's a great machine! One good thing about propane is that you hardly ever have to overhaul one because it doesn't wash the oil off the cylinder walls like gas. Also, the oil stays clean for a long time. Kerry
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