4200 hydraulic issues

[whynot162]

I have a friend about 80 with a 4200. I do not know anything about a john deere tractor.

The rear hydraulics will not lift any more. The loader is sluggish, He says that last year the rear would lift and not stay up, so he just kept using it that way.
After looking I think, or hope for him, that it is just a clogged filter or screen. I was thinking that last year if it was almost plugged, it would lift and as more oil passed the screen/filter it would then clog, and the 3pt, would lower. Just my guess.

Can you give me any ideas where to start, and what to look for.

the oil looks clean, the level is good. I have not gone over to actually look at the tractor, But I would like some ideas before I head over to look at it.

I was going to see if there is noise, or engine load when trying to lift. he also said that he has neglected the maintenance.

I am just trying to help out a poor old guy, get his tractor running again.

Thanks
Doug

 

[beenthere]

Change the hydraulic oil and filter, and clean the screen.
80 is no excuse for neglecting his tractor, and hope you can help him get his problem solved and going again.

 

[whynot162]

yes it is no excuse, but all I can do is move on from here. So I am assuming that there is a spin on filter? and where would the screen be located at.
Thanks

 

[beenthere]

Yes, spin on filter, and screen is next to it on the return line to the pump.

Screen (item #4) looks like this tube.. both on front of tranny. Clean debris out of the screen and replace when clean.

 

[Egon]

[video]http://manuals.deere.com/cceomview/OMLVU11736_L0/Output/LVU11736_LO5.html[/video]

Maybe this site will help?

Check all the valve positions for proper place. Us older folk change things and then forget about them.

 

[whynot162]

Where is the hydraulic stop valve? The manual has been very helpful I see that as an option on the troubleshooting guide but have not found its location in the rest of the parts I have read

 

[beenthere]

It is listed under "Using three-point Hitch" section in the manual Egon linked to.

Located between your legs in the center directly under the leading edge of the seat, and about 3" above the floor mat. Knob is about 2" diam.

 

[Egon]

Operating

 

[Egon]

Operating

View attachment 441441

F in the picture.

 

[whynot162]

Thanks, I feel stupid, Should have looked in the operation part..duh. Thanks for being so kind. trying to find time to go look at the tractor now.

 

[Egon]

Let's just hope it helps fix the old fellars tractor.

 

[whynot162]

Ok, I went and looked at this today. It is all working, I believe it is just that the lever for the 3 point is not moving smoothly. It is quite sticky. And I think if it is not fixed that it will all get bent and mangled up.
So How do I fix that? It is sticking at the valve. I saw ont entry on a stuck valve, is that what needs to be done? Or just buy a valve, and install it?

Part of me just wants to tell him to take it into JD.

 

[beenthere]

There is a friction disk that is adjustable. Look at the control lever going to the rockshaft valve and should be able to see the bolt that needs to be loosened a tad bit.

 

[whynot162]

I did not see an adjustment, Is this drawing the same from this other post? if so which part?
http://www.tractorbynet.com/forums/...ilter-replacement-rockshaft-parts-diagram-jpg

 

[whynot162]

http://www.tractorbynet.com/forums/...555-jd-4310-rockshaft-adjustment-img_2654-jpg

Is this the adjustment? it is the opposite end that is sticking.

 

[beenthere]

I believe it is the locknut on the other end of that shaft where the control lever is attached (right side). There are some belleville washers that create the friction depending how tight that locknut is torqued down. Back that locknut off a bit and see if that control lever moves more freely. I may have mis-spoken when calling it a "friction disk" in previous post.

Otherwise, from the pic shown, looks to be a lot of cleaning that could be done... but wouldn't think that debris would cause the problem.

 

[whynot162]

the debris does not interfere with the movement of the rod. It is hanging up on the end in my photo. I will try to remove the lever, and loosen the nut a little, and see if that fixes it.

 

[beenthere]

There are about 8 pages of "Rockshaft control disassembly and assembly" in the service tech manual for the 4200.

First try just loosening the locknut, without removing the lever. See if that frees it up.

 

[whynot162]

I assume that I can fit a socket down the tube of the handle to loosen the nut? probably less than 1/2 turn. Also the other level that has the roll pin in it, What is it called? as the roll pin is broken and I need him to go get a replacement.
Thanks again for the help

 

[beenthere]

We are on the wrong page, and apparently talking about two different things. Sorry if I have been leading you off track.