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Leaky John Deere

rusty6

rusty6

Well-known Member
Location
East central Sask.
I figured this JD 2140 would be an improvement over the old Massey Super 90 that leaked hyd oil all the time. Wrong, this JD leaks as bad, sometimes worse. I replaced the leaking cylinder on the front end loader but this morning found a pool of oil under the back of the tractor where it had been streaming down from the hyd coupler. I'd noticed some slight leakage here in the past but this is way too much. What do I need to replace here now?

mvphoto60681.jpg
 
What needs replacing will be determined by where the leak is located. If leak is where male hyd tips plug into breakaway coupler barrel then o-
ring & backup washers may be all the parts required. BTW pipe fittings such as those street "L's" aren't designed for 2250 psi.
2 ea R26485
2 ea R495R or R59343
 
Thanks for the ideas and part number. I believe the male ends on the couplers are good so suspect it must be the o rings. I watched this video of a guy replacing
these parts in a 4230 unit which should be the same as this one. He removed the entire SCV from the tractor to work on it.
SCV repair
 
First, examine coupler tips for any damage in the sealing area, then change the O-rings and teflon backup rings INSIDE the coupler barrels where the tip seals.

If that doesn't fix it, look to see if one of the pivoting levers is bent internally to the coupler, making it leak past the tiny O-rings and backup rings that seal them to the barrels.

If all that checks out, the barrels will have to come out of the housings and the O-rings and backup rings inside the housing and the tiny rings that seal the lever mechanism to the barrel will need to be dug out and replaced.

Have the "swear jar" handy if you have to do this.
 
Your loader and tractor will function much
better if the loader is supplied by a tee
off the valve supply line and turned via a
ported filter cover....much less chance of
leaks plus better flow rates.

ben
 
(quoted from post at 14:28:06 08/24/20) Your loader and tractor will function much
better if the loader is supplied by a tee
off the valve supply line and turned via a
ported filter cover....much less chance of
leaks plus better flow rates.

ben
Click to expand...
I wish I knew how to do that but don't have a clue. Wouldn't I have to buy a whole extra valve control for the front end loader then too? Could turn into a pretty expensive upgrade and not sure its that much better.
 
One of the things you need to do as you repair the leaks is replace those black pipe elbow fittings with the proper
hydraulic fittings. Those elbows are not made for hydraulic service. Your local John Deere dealer or hydraulic shop
will have what you need.
Good luck with the leaks.
 
Yes, you will need another valve and control, but it is the recommended application
by Deere. Yours likely already has the ported filter cover, and to tee into the
supply line uses standard hydraulic fittings. A joystick valve is handier and a bit
more flexible in mounting location if it has a cable control.

Ben
 
About 500$ Or 600$ with new valve fittings and hoses if i
didnt need my coupleres on the back plus the loader at the
same time id leave the loader hooked like you have it
 
(quoted from post at 22:04:31 08/24/20) Yes, you will need another valve and control, but it is the recommended application
by Deere. Ben
Click to expand...


IF your statement was true why did JD engineers offer the option of operating NEW FEL from scv's?

Granted returning FEL hyd oil to ported filter cover is the best method but it cost a lot of $$$ to convert SCV control to ind valve returned to ported filter cover & isn't absolutely only method recommended by JD.
 
Up until recent years I had never seen or heard of any other method of running the front end loader except by plugging into the existing hydraulic couplers that
came with the tractors. When needing to hitch up to something else that required hydraulics, simply unplug the bucket hoses at coupler number 2 and use that. It
rendered the front end loader unusable of course but it was not something we needed to do very often so not a big concern.
A previous owner has installed a hose from the bottom of the hydraulic filter running up to the platform beneath the seat and connected to a pressure gauge. I
have no idea what its for. I tried to take a picture of it.

cvphoto54157.jpg
 

rusty
Arrow in your photo is pointing to fitting that you could attach FEL control valve return hose to. Then all you'll need is fittings to attach pressure hose to(see photo below).

mvphoto60711.png
 
Another option I'm considering for this leak is to just remove the original JD outlet block and replace it with a Pioneer. I don't have any other JD coupler
equipment and always have to use the JD to Pioneer adaptors when I hook it up to a Pioneer equipped implement anyway. Rather then spend money on a repair kit that
may or may not solve the leak on the JD original. I'm still a little disappointed in all the money and time spent on that original JD front end loader bucket
cylinder that turned out to be beyond repair.
 

Isnt the loader and bucket already controlled via a one or two handle set of valves along the right side of the steering wheel ?
Who ever connected the loader @$&backwards through the SCV needs a good tuning in .
 

That is where the return oil from a loader , hydraulic motor ,
Backhoe or log splitter is supposed to flow back into the tractor .
 
(quoted from post at 11:03:03 08/26/20)
Isnt the loader and bucket already controlled via a one or two handle set of valves along the right side of the steering wheel ?
Who ever connected the loader @$&backwards through the SCV needs a good tuning in .
Click to expand...
Then you will need to tune in a lot of people because the majority of front end loaders I have ever seen are all hooked up to the SCVs. Its normal here. Not backwards.
 
(quoted from post at 14:27:32 08/26/20)
(quoted from post at 11:03:03 08/26/20)
Isnt the loader and bucket already controlled via a one or two handle set of valves along the right side of the steering wheel ?
Who ever connected the loader @$&backwards through the SCV needs a good tuning in .
Click to expand...
Then you will need to tune in a lot of people because the majority of front end loaders I have ever seen are all hooked up to the SCVs. Its normal here. Not backwards.
Click to expand...

If they had any clue . They would perform the simple re-plumb job on Dubuque/Mannheim utility tractors . The loader will operate faster and smooth without the front pump starving for oil .
Know the fix is possible and not doing it is daft .
The rear SCVs will also now be available for use .
 
If they had any clue . They would perform the simple re-plumb job on Dubuque/Mannheim utility tractors . The loader will operate faster and smooth without the front pump starving for oil .
Know the fix is possible and not doing it is daft .
The rear SCVs will also now be available for use .
Click to expand...
I think you are talking about fixing a problem that does'nt exist for me. I've never had a problem with the smoothness or speed of this front end loader. If it was any faster it would be too fast.
I'll admit I'm fairly new to JD tractors. How would I know the front pump is starving for oil? I find the 2140 a little small and crowded on the operator's platform already and not sure where I'd add another control valve or joystick for the front end loader without it being in the way.
 
(quoted from post at 16:24:19 08/26/20)
If they had any clue . They would perform the simple re-plumb job on Dubuque/Mannheim utility tractors . The loader will operate faster and smooth without the front pump starving for oil .
Know the fix is possible and not doing it is daft .
The rear SCVs will also now be available for use .
Click to expand...
I think you are talking about fixing a problem that does'nt exist for me. I've never had a problem with the smoothness or speed of this front end loader. If it was any faster it would be too fast.
I'll admit I'm fairly new to JD tractors. How would I know the front pump is starving for oil? I find the 2140 a little small and crowded on the operator's platform already and not sure where I'd add another control valve or joystick for the front end loader without it being in the way.
Click to expand...

What controls the loader booms and what controls the loader bucket now ?
Oh it exists . We installed the ported filter return on the 2020, 2120, 1640, 1840 and 2355.
 
What controls the loader booms and what controls the loader bucket now ?
Oh it exists . We installed the ported filter return on the 2020, 2120, 1640, 1840 and 2355.
Click to expand...
This 2140 already has what is called the hydraulic motor connection on the bottom of the filter housing. It appears a previous owner might have even teed into the main SCV pressure line at some time in the life of this tractor as this picture shows a cap plug that does not appear to be original John Deere equipment.

mvphoto60810.jpg
 

rusty
You're correct that is correct place to attach the pressure hose to operate a FEL control valve. You're also correct in that the iron pipe cap isn't standard JD part & was not manufactured to withstand 2250 psi.
 
rusty6

Sorry if I missed this but if I may ask, What do you have for a loader? Unless you have another set of remotes hooked to it one would assume you only have boom lift cylinders and a trip bucket. If the bucket is hydraulic it would have a loader control valve, to operate the lift and bucket, splitting the oil supplied by the hoses from your remotes (or would need to use a second set of remotes for the bucket function).
 
(quoted from post at 03:20:38 08/27/20) rusty6

Sorry if I missed this but if I may ask, What do you have for a loader? Unless you have another set of remotes hooked to it one would assume you only have boom lift cylinders and a trip bucket. If the bucket is hydraulic it would have a loader control valve, to operate the lift and bucket, splitting the oil supplied by the hoses from your remotes (or would need to use a second set of remotes for the bucket function).
Click to expand...
Jim, this is a 146 JD loader much the same vintage as the tractor. (1980s) It has the typical dual hydraulic cylinders on the boom and bucket therefore it uses both of the remote hydraulic outlets on the tractor.
mvphoto60829.jpg
 


This is making more sense now . Now we know your tractor has dual SCV instead of a single SCV .
On some of those they route the oil flow from the SCV discharge port . To the transmission filter cover instead of directly into the transmission case
. If so this would explain the fast smooth hydraulics .
 
(quoted from post at 08:39:27 08/25/20)
A previous owner has installed a hose from the bottom of the hydraulic filter running up to the platform beneath the seat and connected to a pressure gauge. I
have no idea what its for. I tried to take a picture of it.
Click to expand...

b&d
Rusty's photo plus his statement ""contradicts your theory"" on his tractors smooth hyd operation because his tractor's scv's aren't returning to filter cover.

Maybe the gauge attached to ported filter cover is smoothing the hyd's!
 
On closer examination I see that line from the bottom of the filter comes up and "Tees" into the side of one scv and also into the three point hitch rockshaft cover. For some reason somebody installed an inline gauge there too. But yes, this is likely why the oil from the SCVs returns smoothly and quickly to the filter housing.
Click to expand...
 
(quoted from post at 05:24:49 08/27/20)
rusty
You're correct that is correct place to attach the pressure hose to operate a FEL control valve. You're also correct in that the iron pipe cap isn't standard JD part & was not manufactured to withstand 2250 psi.
Click to expand...

Nope , that circuit would rarely if ever see 200psi .
 
(quoted from post at 19:59:49 08/27/20)
(quoted from post at 05:24:49 08/27/20)
rusty
You're correct that is correct place to attach the pressure hose to operate a FEL control valve. You're also correct in that the iron pipe cap isn't standard JD part & was not manufactured to withstand 2250 psi.
Click to expand...

Nope , that circuit would rarely if ever see 200psi .
Click to expand...

If I am reading the technical manual right, that line is the main line to the SCVs so would see full system pressure whenever the hydraulics are used.
 
(quoted from post at 22:48:47 08/27/20)

If I am reading the technical manual right, that line is the main line to the SCVs so would see full system pressure whenever the hydraulics are used.
Click to expand...

rusty
Pressure line supplying scv is shown in this photo that you posted.

mvphoto60890.png
 

I missed that . Thought that cap was on the line from the ported filter cover . Instead of being on the high pressure
Line .
The previous owner must be using something like a backhoe ,
wood splitter or hydraulic motor With that tractor ?
 
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