John Deere 2020 hydraulic problems

[ohio cuda]

I have a John Deere 2020 Type T5R1C, serial number 1080650Twith 3200 hours with 48 FEL. The tractor is new to me and I知 just starting to use. Once I got it home I did the usual engine maintenance and changed the hydraulic fluid, cleaned filters on the transmission sump and the front pump in front of the radiator. Previous owner had done the same, said the fluid he changed was milky and it still looked less than acceptable after I checked it. I put new shifter boots on, original were torn, probably the source for water in transmission. I bought a new sock filter for the transmission sump, screen was torn.

I started doing a little loader work and the front pump started caveating then I lost all power steering and FEL stopped working. The 3-point was holding 1200# rear weight ballast fine and could raise and lower it fine. I idled for a bit, got off looking for a broken line and then power steering and FEL worked, jerky and weak, but enough to get back inside the shop.

I went through a bunch of blogs hoping to find similar problems. Last thing I want to do is replace good parts. I have a maintenance manual on order and 3000# gauges to check pressures.

Looking through the Hydraulic fill hole with 3-point raised I didn稚 see any fluid splashing around, rockshaft piston well sealed. I read one blog where a fellow said he had lots of debris in the Hydraulic PCV (Pressure Control Valve) R39273. I decided to look in mine. The line coming into the PCV looks like it was a brazed repair after sanding the paint. Once I got the PCV off and removed the inlet fitting I couldn稚 get the piston out. As you can see in the picture I looked like it had a clip holding it, strange. I discovered a piece of metal ｽ long ｼ wide (a ***** to get out) was holding the piston retracted. Once out I also noticed 3 extra shims/washers.

I have new O-rings and parts to reassemble. Do you have any idea where the metal came from? I assume it was down stream of pump and missed the filters. Is this a part of the front pump? I appreciate your help and anything else I should look for.View attachment 652665View attachment 652666

 

[Tx Jim]

1st thing I'll recommend is replacing sump screen if it is in photo #5. Is the 48 loader controlled by a 2 spool valve? If so can you post a photo of the RH side of the valve body?

 

[ohio cuda]

I've replaced the screen with a new one from Deere. I'll post pictures of the plumbing. thanks for the reply Tx.

 

[beenthere]

In your last pic, is that a broken line under? arrow..

 

[ohio cuda]

Good catch Beenthere, I think it's a shadow. I'll look in the morning when I go to the shop. I'm surprised I didn't see a fluid leak.

 

[Tx Jim]

For a loader control spool valve test to be certain it not causing the hyd problem remove hyd valve return hose from tractor,aim open return hose in hyd filler hole behind seat. With both control levers in neutral start engine & no oil should exit open hose.

 

[ohio cuda]

Thanks Tx for the tip. I'll try and and let you know either today or Monday. I really appreciate the help.

 

[ohio cuda]

TX I did as you requested with the both loader valves in neutral position. Hydraulic fluid started squirting out the return. However, I loosened the Return connection on the controls, the coupler end was so **** tight. I also found another piece of debris in the supply line to the spools. Attached a closer picture and you can see none of the connections are broken. TX do I need to rebuild the spool now at this point of my adventure? Is there a kit with everything I need? in the supply to the FEL controls

 

[Tx Jim]

ohio
Remove plug in photo & post a photo of the plug & associated parts. If a seal or seat isn't faulty after inspecting parts then complete valve will require being replaced to help cure hyd problems
Jim

 

[ohio cuda]

Jim,
I'll remove that plug and send you those pictures later this morning. I've split my 8N and done a lot of work on that tractor, it's simple compared to this 2020 Deere or maybe it's just got me intimidated. I was looking at the pump in the transmission (on Line not mine) and it looks like the pistons in that pump have keepers on them. Then I looked at the picture of that debris I found and it resembles a chewed up one. Do you agree?

 

[Tx Jim]

1st thing you need to understand is trans pump is a gear pump that lubricates trans shafts/brgs,supplies low pressure(155 psi) oil to operate(if so equipped) hyd hi-lo or reverser & hyd pto. Then excess trans pump output is sent to frt pump. Picture labeled YT is a valve not a piston. Pictured below encircled in pink is photo of frt hyd pump piston. I have no idea from viewing your photo where your broken part originated.

 

[Zebrafive]

I was going to say the same as TxJim (he gets up a LOT earlier then me) your picture is not anything to do with the transmission pump. Where is it from?

 

[ohio cuda]

Thank you both for getting up early. Jim the mistaken valve picture from YT looks a lot like the ends in that picture. I've never had one of these apart and wonder if maybe it's item #15 in the IPB you posted? The shape and ends look to be similar, just a thought.
Here is what I found in the Gresen control, nothing else just these items.

 

[Tx Jim]

I was going to say the same as TxJim (he gets up a LOT earlier then me)

Z5
If you're lucky enough to live long enough to be as old as this old codger you'll probably wake up early in the morning to go to bathroom then fire up computer!!!:laughing:

 

[Tx Jim]

TX I did as you requested with the both loader valves in neutral position. Hydraulic fluid started squirting out the return. However, I loosened the Return connection on the controls, the coupler end was so **** tight. I also found another piece of debris in the supply line to the spools. Attached a closer picture and you can see none of the connections are broken. TX do I need to rebuild the spool now at this point of my adventure? Is there a kit with everything I need?

Due to the fact that the contents of the parts under the plugs don't appear to be adjustable relief valves or Closed-center plug my guess is spool to housing clearance is too great & spools & valve housing will require replacing to stop oil from exiting open control valve return hose.

What is your opinion Zebrafive???""

 

[ohio cuda]

The front pump started whining something fierce. 3-point won't operating and FEL doesn't operate. I suspect the transmission pump digested more metal. When i get my gauges I'll see what the pressure is out of the transmission pump before draining Hydro fluid and looking into filters.

 

[Tx Jim]

When you removed FEL control valve return hose for test where was hose left attached(control valve or ported filter cover)?? One can remove hose from ported filter cover & with all hyd functions in neutral,start engine to check flow out of open orifice on ported filter for "shade tree mechanic" GPM output of trans pump

 

[ohio cuda]

I did the test this morning on the ported filter. Removed hose and let the canister empty. Pulled the coil wire and cranked the engine for 15 seconds, measured the output, 1 pint on the nose. From what I've read the transmission pump is not feeding the volume nor psi required. Now it's getting expensive.

 

[Tx Jim]

I can't remember for sure how these affect hyd filter gpm but I'll advise to check hyd filter relief & surge relief valves to be sure that they're not stuck open. These valves are located close to hyd filter canister

 

[ohio cuda]

The output should have been 1-1/4 to 1-1/2 gallons, I got a pint. Something came a part inside given the debris I've found, time to fix it correctly. When you pull the plug and metal parts fall out you need to find the source, it's just going to get worse. Thanks for everyone's help especially TX Jim.