jdemaris
01-07-2004 05:33:50
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Re: Re: Re: Re: Re: John Deere winch in reply to Bernard le mécano, 01-06-2004 21:23:28
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The JD winch uses "HyGuard" or equivalent. It's just combination transmission & hydraulic fluid. When the winch is on a crawler it is powered by an engine-speed PTO. So, with a crawler at idle speed the winch input shaft is still turning around 800 R.P.M. and can go up to 2500 R.P.M. So, I can see why you you're having problems. Yes, there is an adjustable relief valve on winch - but I don't remember exactly where with the spool-valve setup. I think the new spool valves have it built in, but if you have the first and earliest model, I think it's inline somewhere. When the little rotary valve is used, the relief valve is built into it. I can't think of any reason why you can't use the tractor's hydraulics. The system on the winch is an "open center" design. So, normally, with the valve in neutral, the pump pushes oil with no pressure through the valve and back to sump. When you put it into free-spool position, pump oil is routed to the the brake-hydraulic cylinder and pushes against the springs at 1000 P.S.I. When you put the winch into "winch" position, oil is routed to the same brake hydraulic-cylinder and also the pressure plate on the clutch drum also at 1000 P.S.I. That's about it. Only probem to work around that I can think of is where your blow-off oil goes from the relief valve. Normally, the winch is a "self-contained" system. It's oil reservoir is for gear lubrication as well as hydraulic functions. Since you want to use your tractor's hydraulics, you're going to have the winch and tractor's oil reservoirs separate. You have to, otherwise the winch would eventually get overfilled. Seems, as long as whatever 1000 P.S.I. relief valve you use sends its oil back to your tractor, you'll be okay. Main system oil, from your tractor, of course gets returned to the tractor also. I think, though, as a precaution, I'd make something so, in case the winch gets an internal leak somewhere, excess oil has a way to escape instead of filling the whole winch-case up with tractor oil.
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