There are three popular options for power steering on a H or M. Charlyn or Behlen, and hydrostatic system (commercial kits, or retro from a combine or other system.) The hydrostatic system consists of a steering wheel driven pump that supplies pressure to a cylinder on the linkage or bolster that amplifies the fluid pressure to assist the steering action. There is no connection between the wheel and linkage. This last method is common on more modern (1960s+) tractors and combines. power steering supply is usually one pressure hose and one return. The supply is thus open center one way (to the steering at least). Supply from on board hydraulics must be live, and must use a priority valve if the pump is used for any other hydraulic application and the steering. Many add on systems use a separate pump for pressure (belt driven is common) from a medium duty truck or some passenger cars. Eithe of the two brands mentioned (if used) could need a seal kit, but both seem reliable. Jim
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