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John Deere 4000 (Clooney or G-man)

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Gman

05-29-2003 19:03:15




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I have a JD 4000 when I did a clutch job I attempted to stop a hydraulic leak right behind the throw out bearing,I replaces the two little steel plungers($18.00 a piece) and the housing that they fit in,cured my leak for awhile(1yr.),now the sucker is leaking like a sive again can you two guys shed any light on this problem? is there a seal I missed or worn shaft that I over looked?




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DON

05-30-2003 12:32:46




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 Re: John Deere 4000 (Clooney or G-man) in reply to Gman, 05-29-2003 19:03:15  
ONE OTHER THING TO DO ,REMOVE THE FITTING ON THE PTO VALVE PRESSURE LINE AND PUT A 400R BALL AND SPRING (CANT REMEMBER THE NO. BUT IT IS THE SAME SPRING IN THE SYNCRONISERS) THIS WILL SLAM ON THE SEAT AND HELP THIS PROB. WAS A JD SERVICE BULLETIN ON THIS ABT 1970-1 AS I REMEMBER. DON



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WTW

05-30-2003 10:29:29




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 Re: John Deere 4000 (Clooney or G-man) in reply to Gman, 05-29-2003 19:03:15  
As Chris said your problem is most likely caused by pulsating movement of the PTO engagement pistons causing the o-rings to fail. Pulsations can be caused by several things, pressure supply from main hydraulic pump is one. Piston pump worn out causing a hammering action/pulsation. Another cause is mechanical pulsation caused by uneven finger height adjustment of PTO clutch fingers and pressure adjustment as Chris described. Good Luck Dave W.

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ET

05-30-2003 04:45:21




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 Re: John Deere 4000 (Clooney or G-man) in reply to Gman, 05-29-2003 19:03:15  
If the engagment preasure is low the pistons will vibrate like Chris said and eat up the seals. You need to take the cover off the console and put a pressure gauge in the plug on the side of the engaugment valve and see how the pressure compares to specs. If I remember right you lenthen the plunger rod to increase preasure. I have never had to replace that valve.



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Clooney

05-30-2003 04:05:56




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 Re: John Deere 4000 (Clooney or G-man) in reply to Gman, 05-29-2003 19:03:15  
Gman, sorry, I am not going to be much help to you here. I have only worked on one of those 4000 & that was a while ago. It sounds like Chris has a place to start & maybe G-Man will help as he works on the later tractors for a living [haven't seen him around much lately so you might want to try his E-Mail]..
~Another person to try is WTW [look in the archives for him], he is very knowledgeable on the later tractors.

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chris

05-29-2003 23:08:39




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 Re: John Deere 4000 (Clooney or G-man) in reply to Gman, 05-29-2003 19:03:15  
If your 4000 has the inspection cover under the tractor take it off while the tractor and pto are running. More than likely you'll see that the plungers you replaced are pulsating. The pulsating eats the orings up, what did the old orings look like?? So now take the side panel(clutch side of steering column/dash, below grip handle) off by removing the 5/16 nut by the rear of the exhaust manifold. And adjust the plunger/rod that is connected to the engagement handle, so that it bottoms out in the pto valve(do this with tractor off). Now start and run tractor and pto(at pto speed) and check for pulsation. Have your hydralics been working like they should? If not keep your tractor running for 15 minutes and lightly touch the pto valve, if hotter than the pressure line by the step on the brake pedal side your pto valve is worn out and needs replacement, but damn costly!! you decide, chris, email back if you have any questions

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Gman

05-30-2003 19:29:05




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 Re: Re: John Deere 4000 (Clooney or G-man) in reply to chris, 05-29-2003 23:08:39  
I'd like to thank all you guys for the help,I might have to hollar at you guys again on this problem. Garland



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