JD 5400 3 point hitch slow

[Plasticfan]

Yes just tee the gauge into the power beyond. Another on some valves is a gauge port in the pressure line or multiple pressure ports one of which can be used for a gauge. A gauge in this port would also work

OK I spent the morning running all over town looking for the right fittings and no one had them. I ordered a test kit off ebay and it should arrive Tues. As soon as I can get a pressure reading I'll post it here.
Thanks for everyone's help, Don

 

[Plasticfan]

In an effort to check the plumbing I ran a homemade test. In all these tests the loader valve remained in neutral initially and the 3 point lift lever remained in the up position.

I disconnected the line hooked up to the “IN” port on the loader valve, started the eng and oil blew out that hose forcefully. So that connection is correct.

I then disconnected the line hooked up to the Power Beyond Valve, started the eng and oil blew out the valve but not as forcefully as from the pump. So that kind of checks out.

I then disconnected the hose hooked up to the “OUT” port on the loader valve and started the eng. Nothing came out so I lifted the bucket, still nothing, then I lowered the bucket and oil shot out of the valve. This seems strange to me. I thought the fluid flowed from in to out constantly if the eng is running. Have I found something here or am I just seeing ghosts?

Thanks, Don

 

[oldnslo]

Without knowing what type of loader valve you have what you see is possibly correct.

In the neutral position oil should flow from P- in to power beyond so that function checks out. The flow should be the in to out in this situation.

Now depending on valve / spool type your lift spool can either direct the return flow from the lift cylinder to the curl cylinder or to out or tank port. So again what you are seeing is possibly correct.

I would agree from your test that the plumbing at the valve is correct.

 

[Leejohn]

All the unhooking test was it removing the hoses from the loader control valve ports?

 

[Plasticfan]

Yes, that's how I did it.

 

[Plasticfan]

Got my test equipment this am. Tested 3 circuits, IN port to ldr control, OUT port from ldr control and PB port from ldr control. Test conditions follow: Ldr control in neutral, Rockshaft lever all the way up and RPM at 700 except where noted.

Test 1-PB
0 psi at idle, 300 at 2k rpm, 0 psi with ldr holding front whls off grd about 1 foot.

Test 2-Outlet from ldr control
0 psi under all conditions

Test 3-Inlet to ldr control
0 psi until I starting lifting the frt wheels and then it goes to 1200, probably would go higher if I stalled it completely.

This makes me suspicious of the ldr control. The 3 point can't lift with no pressure. Is it time for a new one?

Thanks to everyone for their help, Don

 

[oldnslo]

The only time you should see pressure in the power beyond is when you are trying to lift something on the 3 point hitch. If the 3 point is not being commanded to move all of the flow should go directly to tank at low pressure.

With the gauge in power beyond port try lifting a load on the 3 point. If still little or no pressure then you will have to dig deeper. Could be the 3 point hitch valve assembly or possibly something in the loader valve.

I wouldn't condemn your loader valve yet.

 

[Plasticfan]

The only time you should see pressure in the power beyond is when you are trying to lift something on the 3 point hitch. If the 3 point is not being commanded to move all of the flow should go directly to tank at low pressure.

With the gauge in power beyond port try lifting a load on the 3 point. If still little or no pressure then you will have to dig deeper. Could be the 3 point hitch valve assembly or possibly something in the loader valve.

I wouldn't condemn your loader valve yet.

I forgot to mention I have a box blade (400 lbs) on the 3 point and the rockshaft lever is in the raise position.

 

[oldnslo]

What do you have for test equipment available? Can you install some type of restriction in the PB line to see if you can build pressure? Worst case plug that line and only run the tractor for a couple of minutes. With the line plugged and no loader function selected you should see system pressure. If no or low pressure the problem is in the loader valve. If system pressure then the problem is down stream in the 3 point hitch valve area.

 

[Plasticfan]

What do you have for test equipment available? Can you install some type of restriction in the PB line to see if you can build pressure? Worst case plug that line and only run the tractor for a couple of minutes. With the line plugged and no loader function selected you should see system pressure. If no or low pressure the problem is in the loader valve. If system pressure then the problem is down stream in the 3 point hitch valve area.

I capped the PB connection where it comes out of the loader valve and started the eng. It got to 2200 psi before I could shut it off. I guess that means it's the 3 point hitch valve. That's a $900 part. I guess that's why they call me lucky.