JD 4200 hydraulic leak??

[duksrule]

I have a JD 4200 with a loader on the front. I don't have an actual fluid leak but there seems to be an internal leak somewhere. My loader bucket will leak down pretty fast if you don't keep hitting the lever to put it back up. My box blade on the 3 point will also bleed down after shutting down the tractor. Seems to have all kinds of lift power on the bucket it just doesn't stay up on its own. I don't see any fluid leaking out. Is there an easy fix? Any ideas?


Also I need someone to help me pick out an new loader valve because I can't seem to find mechanical parts for the one I have. It is a woods loader but they are no help with the valve.

The bucket goes up and down, forward and back and then if you push all the way down on the leaver it floats the bucket. SO... is this a single or double spool etc...

 

[arrabil]

Check JDParts for the valve. It should be the one that came with the tractor and not with the loader. The cylinders in the loader sound like they need to be rebuilt (internal leak). KennyD will hopefully be along shortly if you need more details....

 

[dfkrug]

My loader bucket will leak down pretty fast if you don't keep hitting the lever to put it back up.

What is "pretty fast"? If you don't actually see it move, it is probably OK.

If that is a Woods loader, like a 1006, the company still supports all those
units, as far as I am told. What happened when you contacted them?

 

[duksrule]

I called woods and they said that the individual dealers sorced their own valves when they put the loaders on different tractors. It is not the JD valve that mounts under the seat area. It is a generic on that is mounted up on the loader mount.

If the cylinders were leaking internal would it cause the hitch to blead down? Wouldn't it be odd for all 4 cylinders to be bad?

 

[kennyd]

Like dfrug asked, what kind of time are we talking out?

Are there any numbers or name on the valve? Can you post a picture?

 

[dfkrug]

If the cylinders were leaking internal would it cause the hitch to blead down? Wouldn't it be odd for all 4 cylinders to be bad?

You mean the loader, not the hitch, correct?

The valve is leaking internally, but a certain amount may be OK. Your valve
may or may not have a "load check", which is designed to keep pressure
in the cylinder when the control is moved back to neutral. If it has a
load check, it could be dirty or bad, or if none, then the spool may be
dirty or corroded or worn.

A whole new 2-spool loader valve with regen, boom float, and a joystick
is commonly available. This one is from our friendly sponsor, SurplusCntr
for about $250.
https://www.surpluscenter.com/item.asp?item=9-7401&catname=hydraulic

 

[duksrule]

It leaks down pretty fast. The bucket tilt will actually let it tilt and stuff fall out if you don't keep hitting the stick. Also if you have the bucket all the way off and shut off the tractor, it will be on the ground within 10 minutes. Back when I got the tractor years ago it would hold the bucket up for weeks without the tractor running.

Are you saying that the check valves that hold the pressure are in the valve itself?

 

[duksrule]

Here are a few pictures of the valve. I need to rod ends at the top (there are 3) that connect the joystick to the valve. Mine are worn and pop out if you move the lever to far.

I guess I also need a rebuilt kit if this is the reason that my bucket leaks down.

 

[Egon]

Check all of the joystick linkages for wear etc. They might be your problem.

 

[kennyd]

Machine kept outside? Those heim joints look nasty! As do the hoses.

I assume the are no QD's (quick disconnects) between the valve and the cylinders?