JD 4200 hydraulic leak??

[duksrule]

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

Yes and Yes.

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

It does have QDs but none of them leak fluid.

 

[kennyd]

It does have QDs but none of them leak fluid.

Excellent. Raise the bucket and set it on something-like a truck bed or retaining wall.

Now, shut the tractor off, relief pressure by moving the joystick-then disconnect the 4 QD's. now back the tractor away so the bucket is in the air and see if it still leaks. Yes-the cylinders are leaking internally. No-the valve is bad.

 

[duksrule]

Thanks, I'll try this and let you know what happens.

Is it possible to rebuild the cylinders at home? I can do pretty much anything when it comes to a car.

 

[kennyd]

Thanks, I'll try this and let you know what happens.

Is it possible to rebuild the cylinders at home? I can do pretty much anything when it comes to a car.

Sure, it's not that hard...do some searching in the hydraulics forum-there are plenty of threads there, try key words like "rebuild" and "seal". Posting pictures of the cylinders, especially the end where the rod comes out will help us help you.

 

[banjodunn]

G'day don't know about over there but here those rose joints ( as we call them i think you call them heim??) are readily available at most specialist bearing supply shops far cheaper than genuine


Jon

 

[dfkrug]

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

I do not know your valve, but the hex caps on your 2nd photo in post
#8 are most likely "load checks". If you remove one, there is probably a
spring and a ball in there. Maybe some crud, too. Those hoses look
awful, but you don't need me to tell you that.

I see the Power Beyond port on your valve is not used. I wonder how
the loader valve is connected to the rest of your hydraulics. Does your
tractor have any of the stock "SCVs" under the seat on the right side?

 

[Willl]

Excellent. Raise the bucket and set it on something-like a truck bed or retaining wall.

Now, shut the tractor off, relief pressure by moving the joystick-then disconnect the 4 QD's. now back the tractor away so the bucket is in the air and see if it still leaks. Yes-the cylinders are leaking internally. No-the valve is bad.

That won't work.

http://www.tractorbynet.com/forums/hydraulics/179487-cylinder-drift.html

 

[kennyd]

That won't work.

http://www.tractorbynet.com/forums/hydraulics/179487-cylinder-drift.html

It does work until the pressure is equalized.

 

[duksrule]

I do not know your valve, but the hex caps on your 2nd photo in post
#8 are most likely "load checks". If you remove one, there is probably a
spring and a ball in there. Maybe some crud, too. Those hoses look
awful, but you don't need me to tell you that.

I see the Power Beyond port on your valve is not used. I wonder how
the loader valve is connected to the rest of your hydraulics. Does your
tractor have any of the stock "SCVs" under the seat on the right side?

Not sure what is under the seat. I have never had it off. I know that the loader is plummed in, there is also another actuator under the tractor that use to be used to raise the belly mower and is controlled by a different valve and then there is a set of QDs on the very back that look like you could plug something into it.

Yes I know the hoses look bad. Sad thing is 2 of them are only 2 years old. Unfortunatelly I don't have a place to store it. It has been a work horse of a tractor for me though.

 

[dfkrug]

Not sure what is under the seat. I have never had it off. I know that the loader is plummed in, there is also another actuator under the tractor that use to be used to raise the belly mower and is controlled by a different valve and then there is a set of QDs on the very back that look like you could plug something into it.

Your tractor comes with a 1-spool or 3-spool monoblock valve attached to
the main gearbox's right upper side. Normally, hydraulic pressure to operate
your valves goes from your implement pump to your factory valve(s), and
then from that valve's PB port to the 3-pt cyl valve. If you add an
aftermkt valve, it must be plumbed in series with the other valves, or get
its hyd power from a diverter. Since your Danfoss valve does not use
its PB port, it should be plumbed off a diverter. If it is not, its OUT
port (which is not designed to handle high pressure) may be plumbed to
the IN port of the SCV(s) or the 3-pt, which is not correct.

Something does not seem right here.