John Deere 2020 hydraulic problems

ohio cuda · Apr 25, 2020

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 652665 View attachment 652666

Tx Jim · Apr 25, 2020

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 · Apr 25, 2020

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

beenthere · Apr 25, 2020

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

ohio cuda · Apr 25, 2020

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 · Apr 26, 2020

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 · Apr 26, 2020

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

ohio cuda · Apr 26, 2020

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 · Apr 26, 2020

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 · Apr 27, 2020

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?