![]() ![]() The system on the winch is an "open center" design. I can't think of any reason why you can't use the tractor's hydraulics. When the little rotary valve is used, the relief valve is built into it. 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. Yes, there is an adjustable relief valve on winch - but I don't remember exactly where with the spool-valve setup. So, I can see why you you're having problems. So, with a crawler at idle speed the winch input shaft is still turning around 800 R.P.M. When the winch is on a crawler it is powered by an engine-speed PTO. It's just combination transmission & hydraulic fluid. The JD winch uses "HyGuard" or equivalent. Re: Re: Re: Re: Re: John Deere winch in reply to Bernard le mécano, 01-06-2004 21:23:28 Best thing is operate the winch with the cover off and observe what's going on. Its rotary, and relies on brass sealing washers that tend to get scored. Also, if the control valve you're using is a small square valve (not a spool valve) then it's probably got problems. ![]() The cylinder has a piston in it with one o-ring - that's all. It's possible the hydraulic cylinder that permits free-spool is leaking, but there are other problem areas. If the winch won't hold, it's most likely the brake band got oil on it. So, pressure releases the winch (free spool) and spring pressure makes the brake band grab. Pump pressure goes to a spring loaded hydraulic cylinder. So, a weak pump, bad valve, or clogged screen can cause free-spool problems. and sucks its oil through a pickup screen. The little Webster hydraulic pump must put out 1000 PSI. Basically, two different problems that could be related. Most service problems I've encountered with the Deere winch (besides oil leaks) are #1 free spool stops working - especially at low engine speeds and #2 winch won't hold. The pump has to generate 1000 PSI at a fairly low speed. Deere winch uses it's own hydraulic pump. No, I don't own a manual but the winch is pretty simple if it's a John Deere winch and not a Gearmatic or Cargo. Re: Re: Re: John Deere winch in reply to Bernard le mécano, 01-06-2004 14:05:11 Years back, the same winches on the 350s were used on 440 and 540 skidders. Considering you're using it on a small crawler, perhaps things won't be so bad. If you had to replace a rotary valve, Deere would offer you a change-over kit for around $700 (back in 89). Finally, in the late 80s, Deere gave them up and changed back over to a spool type valve. We changed them left and right on logger's machine. Then, Deere changed over to a little square rotary valve, and they were garbage - expensive garbage at that. If you're lucky, your winch is early enough to have a spool type control valve. Same pump is used on snow plows on pickup trucks. The hydraulic pump is a little Webster and can be found by aftermarket suppliers. skid two trees at at time instead of four if it slips a little. The brake band, however barely holds even when all is perfect. 99% of the time, the clutches and brake band in the winch get oil soaked and not worn. I'd advise you to be very conservative with parts replacement. I can only assume the parts are more now, unless the Chinese are making them. Also, if your winch is an early one, the hydraulic pressure plate and seal was superceded to a newer style - and that was around $500. Brake band was over $200, hydraulic pump was over $300, winch control valve was over $300, etc. I haven't worked for a Dealer since 89, and at that time the part prices were crazy. Re: John Deere winch in reply to Terry Van Gorder, 01-04-2004 14:37:52 ![]()
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