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John Deere Tractors Discussion Forum
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4020 hydraulic pump leak revisited

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Ted K/MN

09-12-2004 14:30:23




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A few days ago I posted about my drippy hyd. pump on the '65 4020D. I presumed it was the shaft seal, but some of you said to check at other spots before I remove the pump. Well, I steamed the pump off as best I could, ran it for a while and soon the trickle of fluid came dripping off, but not from anywhere near the shaft seal. It is coming from the top of the pump and running down around the righthand side in the area of the piston plugs. I cannot see up in there well enough to tell exactly where it is originating from. I checked the clamps on the short hose between the top of the pump and cooler, clamps were not really tight, so after tightening them it seemed to slow some, and I ground two batches of feed with it and only a couple of drops showed up. Thought I had it taken care of. Of course just sitting still on the grinder mixer required no hyd. pressure other than to steer it around a bit in the yard. Today I hauled manure with it and a pretty good sized puddle showed on the front axle casting by the time I returned to the yard. So, questions: Is it common for the piston plugs to begin to leak? Wouldn't the oil cooler hose leak even w/o pressure, even when the engine is shut down? Finally, the manual says to remove the pump out the bottom after removing the front axle. Would it be any more hassle to go out the top after removing the radiator/fuel tank? That way, I would be able to get at the connections easier, maybe be able to replace the piston plug seals w/o taking the pump out and not have to work under the thing hoping the supports are adequate. Anybody done it this way? Any advice would be greatly appreciated. Thanks, Ted

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Steph MN

09-13-2004 20:10:17




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 Re: 4020 hydraulic pump leak revisited in reply to Ted K/MN, 09-12-2004 14:30:23  
You might want to check condition of the short hose that you tightened the clamps on, heat and oil can wear even oil resistant hose quickly.(check to see if hose is getting hard)



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Ted K/MN

09-13-2004 06:16:30




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 Re: 4020 hydraulic pump leak revisited in reply to Ted K/MN, 09-12-2004 14:30:23  
Thanks! I'll see what I can find before taking the pump off, then tie into it if needed.



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Brad B

09-12-2004 19:03:42




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 Re: 4020 hydraulic pump leak revisited in reply to Ted K/MN, 09-12-2004 14:30:23  
there is a plug on the top of my 3010 pump at about 11:00 position that was loose and leaking oil. I had to heat a wrench and bend it to 90 deg. to get to it and tighten it up. If you got it cleaned up and watched for where the oil comes from you may find he source. Took me a couple days to find my leak. I allso had to replace the short hose to the oil cooler and the two o-rings on the connection to the top of the pump. Neighbor has a 3010 with the front all off for a restoration and the pump is all exposed and looks like it could be taken out that way. I changed mine from the bottom like the manual says. Figure six hours to take it out and six to put it all back.

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msb

09-12-2004 19:58:57




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 Re: 4020 hydraulic pump leak revisited in reply to Brad B, 09-12-2004 19:03:42  
Before I went to all that trouble of removing the pump, I would replace those 2 o-rings on the banjo fitting that connects the hose to the pump hosing.They have a history of springing leaks.Now when you remove the o-rings they are going to look like they are too small to seal but they will fool you.And that oil cooler operates at 150 psi. pressure and it takes a little bit for it to drop off to zero if everything else is right.

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