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John Deere Tractors Discussion Forum

2940 hydraulic problems

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Tim Boyd

02-13-2020 22:59:01

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Hello everyone, I have acquired another tractor. It is a jd 2940 "ser# 397075L". I got the tractor with hydraulic issues and it has 7067 hours on it,and is in very good shape. It doesn't look like it has been abused. The previous owner said he believed that there were internal transmission pipes that were the likely problem,says that the 3pt is really jerky when it gets warm,power steering acts up on occasion and he believes that the hydraulic oil is getting hot and is causing the seals to blow. The power steering cylinders were leaking and I repaired them just so I could get in and out of the barn without major oil loss. Now I know my description of the issues are not all that great, this is a new tractor to me so I'm going in mostly blind, I understand that the tractor will need to be split. Many people have said this model is a throw away,but I would like to think I'm fairly handy and I have a lot of time and enjoy working on challenging tractors.so could anyone point me in the right direction. Thank you very much for any advice.

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Tx Jim

02-15-2020 09:12:07

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  

I thought trans pump pressure on JD utility tractors was closer to 155 psi than 800 psi but I don't have access to a 2940 tech manual.

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Resting Relics 1

02-17-2020 10:54:08

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 Re: 2940 hydraulic problems in reply to Tx Jim, 02-15-2020 09:12:07  
You could be right Jim. I'm just going by memory which ain't what it used to be. Need the tech manual.

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Resting Relics 1

02-15-2020 08:24:51

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
Hey Tim, I worked for a John Deere dealer at the time the 2940's were new. They were an improvement over the 2840 but not by much. Had many of the same issues. The internal hydraulic control piping cracking in the transmission case was one of the more common problems. Those pipes carried charge pump oil pressure, 800 psi, which functioned the PTO, High/Low, and forward reverser if equipped. When those pipes crack you'll lose charge pressure to the main pump and that could cause lots of problems. It could also be that you just have a high pressure leak somewhere and the main pump runs out of oil and causes the chatter or heating of the oil. Long story short is you'll need some gauges and the Tech manual to diagnose whats going on. Good Luck!

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Tim boyd

02-14-2020 08:54:07

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
Thank you everyone! I will start by getting repair books.

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02-14-2020 08:50:21

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
Quoting Removed, click Modern View to see

Yeh...the blown packings/o"rings on the rockshaft is worth a look.

These tractors can be fairly complex depending on configuration. Pipes inside the transmission can blow out or split...or wear a hole in rubbing another pipe....

I went through the front half of a 2940 transmission a couple years ago. Be warned that many parts are no longer available through Deere(quad-pack for sure).I had to source parts through a salvage yard.....some of the internal pipes sub to other Deere numbers which require other parts to fit...parts can be a mess!

Probably the first thing I would do is drain the trans oil and filter into clean buckets....pull the screen out of it and inspect for trash/debris....Hope it don't have a cab or loader on it!! Makes these awful to work on...

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02-14-2020 08:20:03

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
You need Deere service manuals but check Ebay for a good original before paying big money to Deere. Some of the Deere reprints are not the best quality.Tom

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Tim S

02-14-2020 07:47:15

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
You have my Condolences...But start out by checking the sump screen/filter first,,but I know they will be clean..(the guy before you already did that),,it could be a cracked pipe in the internal system..you will be splitting it,, some thing else to check is to be sure the cone that fits into the transmission filter is in place,, i have seen them get away and nothing holds the filter in place,, so it will get to spinning in the bowl, a the end seal gets torn off and sent through the system...there is plenty of help on here to help you with it...

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Tech 7

02-14-2020 06:39:53

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
Get the manuals as others have said, but in the meantime have a look in through the hydraulic oil filler to see if there is oil spraying around indicating a rockshaft leak. This is a common issue on the JD utility tractors and is not a difficult fix. No split required.

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Tx Jim

02-14-2020 04:23:19

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
I'll 2nd what Jim.ME stated. You need to acquire TM1220. It surprises me that the printed or CD or downloaded versions are priced so close to each other.

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02-14-2020 04:03:37

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 Re: 2940 hydraulic problems in reply to Tim Boyd, 02-13-2020 22:59:01  
If you are going to do this start by getting the John Deere Technical and Operator's manuals for it. There is diagnostic info to help pinpoint the issues and recommended fixes. The manuals give you a guide to nomenclature and the systems, then members here can help with questions you have.

This site has some manuals, I don't know if they have reprints of the JD manuals or something else. You would need to call and confirm what they have.
You can find the OEM JD manuals (printed, CD, or downloads) at https://techpubs.deere.com/Products/ProductSearch.aspx. There is a phone number (1-800-522-7448) there if you want to talk to a person to confirm the right manuals.
If you don't want to purchase a parts catalog you can use the on line parts catalog at https://jdparts.deere.com/servlet/com.deere.u90.jdparts.view.publicservlets.HomeUnsigned?selectedMenu=JDPARTS_HOME&userAction=countrySelected&country=US&language=19.

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