When you turn the steering wheel do you feel any surge on the steering wheel at all? When you release pressure on the steering wheel does it move back against the direction you are turning it a slight amount?
Does your tractor have a separate PS pump or does it use a priority flow divider valve?
If it has the flow splitter try operating the power steering while holding the valve for the lift arms in the raise position, continue to hold the valve while the lift arms are stalled out in the maximum raised position. If the PS works while the arms are stalled out and still have pressure applied that indicates a bad regulating valve in the flow divider section of the valve , that is the first valve section on the left side of the valve bank of valves.
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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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