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4020 hydraulic oil leak

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eb77

04-19-2003 19:32:44




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I have a large hydraulic oil leak between the engine and transmission about 1 quart per hour at the dust cover. This is a 1969 4020 Syncro. I'm afraid it has affected the PTO clutch because it slips easily. Any ideas where the oil could be coming from? Does the tractor need to be split? I am a pretty good mechanic and have half a mind to tackle it. If it does require a split, what are the normal items to repair when the tractor is split?

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G-MAN

04-20-2003 11:27:30




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 Re: 4020 hydraulic oil leak in reply to eb77, 04-19-2003 19:32:44  
First of all, get ahold of the correct service manual for this tractor. Any oil leak in that area is going to require the tractor to be split. As was mentioned, use good splitting stands and be careful. Also do yourself a favor and replace the rear main seal while you're there, even if it's not where the leak is coming from - cheap insurance while you have it split. Also consider having the flywheel resurfaced and inspect the starter ring gear while you're there - more cheap insurance. Just a helpful hint - be careful with the steel hydraulic lines that have to be disconnected to split the tractor. They're fairly easy to damage if you get to horsey with taking them loose, as the nuts are often "bonded" to the fittings, and you'll end up twisting the lines. They're not terribly expensive to replace, but they're also not much fun to replace. A little heat applied to the nuts will make them come apart much easier. With the proper manual and the clutch setting gauge that you can probably borrow from your JD dealer, this is not a big job. I would also recommend setting up the clutch with the flywheel off the engine. It's much easier to do on a bench than hanging on the back of the engine. The manual will cover that procedure.

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davidval

04-20-2003 07:28:48




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 Re: 4020 hydraulic oil leak in reply to eb77, 04-19-2003 19:32:44  
1969 model should have hydraulic pto clutch/brake actuator (ser # above 201000).if so,could be leakage from pto operating pistons (pins}. try to observe changes in leakage rate with pto on, off and braked, if there are changes leakage is probably from this area.
could also be from the oil seal in the clutch housing,(replacing it requires tractor split between clutch housing and transmission), or the oil seal between clutch shafts.
david

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DON

04-20-2003 06:04:47




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 Re: 4020 hydraulic oil leak in reply to eb77, 04-19-2003 19:32:44  
THAT 69 4020 HAS A HYD. OPERATED PTO BEARING AND THE O-RING SEALS ON THE OPERATING PISTONS ARE WORN OUT. THE TRACTOR NEEDS SPLIT AND THE OPERATING PISTONS SEALS REPLACED. THE CLUTCHES WILL HAVE TO BE REPLACED AS WELL AS THEY ARE OIL SOAKED . THERE WERE SEVERAL IMPROVEMENTS DONE IN THIS AREA , NEW BALANCED PTO LEVERS , A SPRING AND BALL ADDED TO THE VALVE TO PREVENT HYD SURGES ETC. CHECK WITH A JD MECHANIC AND HE CAN POINT YOU IN THE RIGHT DIRECTION. ALL IN ALL NOT A BAD JOB (COSTLY)BUT USE SPLITTING STANDS AND BE SAFE

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eb77

04-30-2003 14:27:28




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 Re: Re: 4020 hydraulic oil leak in reply to DON, 04-20-2003 06:04:47  
Don, I finally found the leak to be coming from a lower dowel pin that moves forward when the PTO is engaged. Still going to check on parts prices. It almost looks like it could be removed without splitting the tractor, but I am not sure. I saw an old post in the archives that said, if there was a 4020 weakness, it is the PTO. Do you know of any going prices for service work?



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chris

04-20-2003 20:59:55




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 Re: Re: 4020 hydraulic oil leak in reply to DON, 04-20-2003 06:04:47  
Like davidval and Don said it could be the pto pistons/orings, if it is or not do what they said and also adjust the pto lever, when its out of adjustment it causes the pistons to flutter because of uneven pressures and eats the orings within hours. Have seen a 4320 split six times for leaking pistons before the pto lever was adjusted.



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ET

04-20-2003 03:48:27




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 Re: 4020 hydraulic oil leak in reply to eb77, 04-19-2003 19:32:44  
Is it engine oil or transmission oil. It is either a rear main seal or Input shaft seal. The tractor needs to be split for both. The first time I split a 4020 it took all morning to get apart, now I can do it in 45 minutes on a good day.



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Jack

04-19-2003 19:42:48




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 Re: 4020 hydraulic oil leak in reply to eb77, 04-19-2003 19:32:44  
If you are going to split it ,might as well do everything it needs.Tho splitting it is really not that big of a deal,takes about 8-10 hrs with right tools.



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