From about 1961 to 1964 I owned a 1941 B with a front loader I bought from an old mechanic who worked at the IHC dealer He had modified the valve body so that the hydraulic fluid fed out of the power lift to an external open center spool valve assembly to run the loader cylinders.
I can remember that he had removed the foot petals on the lift and the cam that operated the spool inside of the JD power lift valve body. There was a fill plug (If I remember correctly) that was directly above the JD valve piston or spool he had made a spacer rod that held the valve body down when it was placed under the filler plug and the plug was tightened down.
The rock shaft was not usable but you could operate 1 remote cylinder or 1 set of remote cylinders from each spool on the external valve.
Here again I believe with the JD valve control piston in the up position the oil bypassed and went back into the return cavity, when the cam pushed the valve piston down it blocked the bypass and the fluid was directed to the piston that operated the rockshaft.
I haven’t been able to find a hydraulic print on the old John Deere’s so I can’t be certain about the hookup, I remember that a hose came from the Power lift casing and went to the pressure port on the external valve whether he had drilled the casing to add a ½” pipe threaded port drilled into a passage or whether he had used and existing pipe port is what I cannot remember.
I also remember that the operation of 2 approximately 3” cylinders on the loader was slow so I think you are dealing with a fairly low volume pump in the older JD’s.
Maybe some of the JD guys can address this that is the only JD I ever owned and that has been nearly 50 years ago so that is all I can recall about the setup.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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