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John Deere 2840

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76jd2840

New User
My Jd 2840 keeps blowing seal at hi-lo clutch assemblies between the hi lo clutch and clutch housing and leaking hydraulic oil into clutch housing. @pjbrown?
 
I would say that the slip rings are allowing high pressure oil out against the seal. It is not made to hold the high pressure. This is a weakness on these tractors if it has ever been towed while not running it wears the tube and housing to where it will not seal correctly. It is an expensive repair just in parts along without the considerable labor involved. This is a BIG weakness in this tractor.

Many consider the JD 2840 to be the next worst tractor JD made behind the JD 2010. Great engine but weak clutch and Hi-Lo issues. Kind of a run Forrest run type of tractor if bought used.
 
(quoted from post at 20:08:17 01/30/16) I would say that the slip rings are allowing high pressure oil out against the seal. It is not made to hold the high pressure. This is a weakness on these tractors if it has ever been towed while not running it wears the tube and housing to where it will not seal correctly. It is an expensive repair just in parts along without the considerable labor involved. This is a BIG weakness in this tractor.

Many consider the JD 2840 to be the next worst tractor JD made behind the JD 2010. Great engine but weak clutch and Hi-Lo issues. Kind of a run Forrest run type of tractor if bought used.
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Which slip rings are you referring too I've been inside of the tractor a few times. Is it 27 that your referring too?
 
(quoted from post at 21:39:53 01/30/16) The seal failures are a symptom not the cause.
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Yes sir at first I thought this was the main problem because someone had installed the seal improperly. But after replacing twice I now know that I have some other problem may it be a worn shaft or a problem with excessive pressure in the case. Just thought some of you guys may have already been through this
 
Yes the slip rings(27) are on the shaft(#26) and run in housing (#29). These will leak allowing high pressure oil out against the lip seal. If the housing and shaft are not PERFECT they will leak. This is what usually gets damaged if someone tries to pull start the tractor. They sometimes will pull start if you pull them fast and long enough to build pressure in the hydraulics. The trouble is you usually ruin the Hi-Lo clutch pack while doing this.

The one dealership I worked at sold 28 NEW JD 2840s over the years. They where the BIG tractor on many of the smaller dairy farms in the 1970-80s. So they got worked hard. They kept us busy in the shop when they got some age on them. I hate working one a JD 2840. Especially the hydraulic system. If some thing is ran to where it spread metal in to rest of the system you may as well take everything in the system apart and clean/rebuilt it right then,. If you do not then you WILL over the next year or so.

The best thing I found for them was to take the engine and put it into a JD 3020 frame. You had a GREAT tractor then. That six cylinder motor was smooth and ran well.
 
Hi JD seller
Totally agree with you, from what I read here with lots of those tractors from those ranges and what I see around used and from personal experience. I had an 1830 in for a customer got over 10.000 hrs on and it all fell apart with similar issues in the high low and a few other places. Bearings turned a wore housings in the 540/1000 pto as well, the $70 leaking seals turned into 0000'S of parts if the guy wanted to spend the money.

The farm i worked on had a 2950 it started playing up at 9000 hrs. I told the boss we wont be driving this pile by 10.000 hrs. At 9500 hrs he traded it on a 6410 I pity the guy that got the 2950, by 8500 hrs that 6410 had gone to it was a money pit as well. Maybe the dealer new the 2950 was junk and re paid the favor with a junk 6410, There a a few more 10.000 hour ridden hard put away damp 64 series round here like that starting to collect $15.000 work orders L.O.L.
Regards Robert
 
(quoted from post at 22:08:17 01/30/16) I would say that the slip rings are allowing high pressure oil out against the seal. It is not made to hold the high pressure.issues.
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JD Seller
When you state high pressure are you referring to stand-by pressure of frt pump? I was thinking only trans pump pressure could get to hyd hi-lo through the hyd hi-lo supply tubes.

76jd2840
Have you checked hyd hi-lo operating pressure(155-165 psi)and sealing area for wear
 
My JD 6400 just turned over 17500 hours. It has been one of the best tractors I have ever owned. I had to do the transmission input shaft at 10000 hours and then a head gasket and value job at 16,000 hour. Other than those it has just been the normal starters, alternator and batteries. I am currently looking for a JD 6410 to take the load off the JD 6400.
 
(quoted from post at 22:00:24 01/30/16) Yes the slip rings(27) are on the shaft(#26) and run in housing (#29). These will leak allowing high pressure oil out against the lip seal. If the housing and shaft are not PERFECT they will leak. This is what usually gets damaged if someone tries to pull start the tractor. They sometimes will pull start if you pull them fast and long enough to build pressure in the hydraulics. The trouble is you usually ruin the Hi-Lo clutch pack while doing this.

The one dealership I worked at sold 28 NEW JD 2840s over the years. They where the BIG tractor on many of the smaller dairy farms in the 1970-80s. So they got worked hard. They kept us busy in the shop when they got some age on them. I hate working one a JD 2840. Especially the hydraulic system. If some thing is ran to where it spread metal in to rest of the system you
may as well take everything in the system apart and clean/rebuilt it right then,. If you do not then you WILL over the next year or so.

The best thing I found for them was to take the engine and put it into a JD 3020 frame. You had a GREAT tractor then. That six cylinder motor was smooth and ran well.
Click to expand...



I absolutely love the tractor it rides awesome runs great and is pretty strong but I can't get this one leak fixed I bought it out the bushes for 500$ with a spun main beating so I trashed that engine and put a used engine in it everything else on the tractor is in good shape and ready for paint except for this leak that has been screwing me since about a year ago so I think as soon as I get this leak stopped I'm gonna paint it and the loader and slap a for sale sign on it and get my money back I have about 6,000 in it now so I'm hoping to get my money back out of it and get a 4040,4240,or a 4440
 
Jim it is charge pump pressure which is higher than the seals are designed for. HIGH pressure is all situational. Quit trying to over think the tractor. If You in the main pump then high pressure is 2250 not charge pump pressure, but in the high low the charge pump pressure is the HIGH pressure against seals designed to only hold gravity pressure.
 
I hope you can get more than you have in it but if your at $6000 and still have to paint it your going to be close. A JD 2840 with many hours on it will not bring much more than $6000-7500 around here. Even then they are a slow seller.
 
(quoted from post at 23:48:41 01/31/16) Jim it is charge pump pressure which is higher than the seals are designed for. HIGH pressure is all situational. Quit trying to over think the tractor. If You in the main pump then high pressure is 2250 not charge pump pressure
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JD Seller
I was only attempting to get you to clarify your high pressure statement. I wasn't trying to over think the problem. I'm fully aware that factory stand-by pressure is suppose to be 2250 psi. I've never witnessed trans pump pressure get high enough to leak past the steel sealing rings while I was employed at dealership.

Thank you for clarifying your vague answer!!!!
Jim
 
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