Posted by karl f on October 24, 2007 at 00:39:42 from (172.135.70.244):
am i correct in assuming that the simplified hydraulic flow chart for these machines is pump>mcv, divided^>3pt lift>auxilary valves>mcv ?? and the aux valves, if installed, would feed from the back from the lift housing and return to the external tube(s)? the cih parts site illustration is confusing, it calls one of the longer lines connected to the mcv "mcv bypass" but the shorter lines connected to it "return." I am trying to make an improvement to the road/brush mowing 685, as the setup now has the mower lift controls crudely tapped in series into one of the mcv lines (bottom if i recall right) and snaking about 10 ft of hose 2x under the tractor to be dragged and caught on all kinds of objects. with the low clearance of 24" tires, tying them up isn't much better. What i want to do is eliminate as much uneccessary hose as possible. the tractor does not have remote valves, but with the existing cih plumbing and the mower lift valve design being power beyond, i see a possible way to simplify it without spending a lot.
right now if my flow chart is correct, the mower valve is plumbed so that it returns working pressure to the hydraulic system in neutral, but none when actuated, it dumps the return oil to tank. have not put many hours on it, but my dad was complaining of steering loss occaisionally, possibly when operating the mower lift valve. Since the complaint, i changed the filter, but weather was not cooperative to try it out. At any rate, I just don't like the crude plumbing and the hoses extra vulnerable.
let me know if i'm on the right track, and i'll tell/ask more thanks karl f
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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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