JD M optional remotes???

Yes, there was an option late in the M series production. Henry is right on: it was essentially like that used on the 35 loader.

The high and low pressure lines have a split point right where they pass through the dashboard. The kit removed the high pressure line from there to the rockshaft cylinder and went to the rear of the machine first. The cast iron coupler/control valve would direct the oil to the 'return' line, which went to the high-pressure input port on the rockshaft cylinder housing.

When the remote valve was centered, the pressure bypassed into the rockshaft controls as if the remote weren't there. The 35 loader used the same basic valve, but located it in a different spot, of course.

I have no idea where you'd get one of these today. It was a rare, rare thing to see an M with one of these options on it.

Oh, and the coupler itself used a different long-nosed coupler style than we use today. I have no idea where you'd get those, either. I suppose you'd have to change to the modern style.

Stan

I don't think the M came with a factory remote option. However I think you could plumb a homade/aftermarket system in the same way that JD plumbed in the hyd valve for the #35 loader if the tractor did not have a remote valve. Keep in mind that only open center valves can be used since the fluid is constantly on the move either to perform a function as directed by valves or going through the bypass valve/valves in the lift assembly. Be careful in that you do not get too large a capacity valve, bigger is not better. Get one based on the flow rate of your system and also a relief valve that bypass before overloading your system, I am not sure what it is for the M. If someone don't have a better idea, I could try to send you a schematic out of the #35 loader manual to peruse.