Farmer we did some farming with in the 80s had propane tractors. On a hot KS day with a hot tractor you had to bleed a lot of vapor off to move much liquid. He had a piston pump with two cylinders connected by a common rod. The vapor pressure was used to cycle the piston back and forth in one cylinder and the second cylinder would pump liquid. Think of it as sort of 2 hydraulic cylinders hooked together if that helps. The cylinders were different size, I think the larger was driving it with the vapor and the smaller pumped liquid.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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