John Deere 5720 Steering Problems

[Fred au]

My steering recently become heavy over a period of 2 hours. Extensive testing by John Deere showed no problems. They then started telling me to replace parts. I have replaced the orbital steering unit and priority valve. I believe that it may be airated oil causing the problem. Nobody knows anything about these tractors in Australia. Has anybody had problems like this in Europe? The tractor is well serviced and looked after and has 2 000 hours on the clock. Could it be oil pickup/ oil pump causing these problems, all other functions work fine. Could somebody please help me or forward this to someone who is a specialist. So far this as cost me $6000 au with no result.

 

[Simon Chiles]

My steering recently become heavy over a period of 2 hours. Extensive testing by John Deere showed no problems. They then started telling me to replace parts. I have replaced the orbital steering unit and priority valve. I believe that it may be airated oil causing the problem. Nobody knows anything about these tractors in Australia. Has anybody had problems like this in Europe? The tractor is well serviced and looked after and has 2 000 hours on the clock. Could it be oil pickup/ oil pump causing these problems, all other functions work fine. Could somebody please help me or forward this to someone who is a specialist. So far this as cost me $6000 au with no result.

Damaged dime valve where the ls line from the steering enters the spool valve slices? A clue would be if the steering gets lighter when you stand on the brake pedals.

 

[Fred au]

Damaged dime valve where the ls line from the steering enters the spool valve slices? A clue would be if the steering gets lighter when you stand on the brake pedals.

What is a dime valve. The load sense line from steering unit goes into the priority valve which has been replaced. I am not aware of the brakes altering the steering if applied. I am led to believe you have plenty of these over here. The oil is very aerated in the sight glass could this be the problem.

 

[Bury the Trash]

might be better to post this in the Machinery or workshop section

and btw we're all off to bed about now

 

[TripleSix]

Is there any bearings or joints between the steering wheel and the orbital?

Suspect these first.

 

[Fred au]

cab tractor only 2000 hours no that's free

 

[Dog&stick]

Are you using the correct oil?; if the wheels are off the ground does it change or stay the same? ; do all the other hyd functions work as they should?

 

[Exfarmer]

might be better to post this in the Machinery or workshop section

and btw we're all off to bed about now

@JP1

 

[Tractortech]

Now Then..
I rather doubt your tractor was tested by John Deere, it would be a John Deere dealer I presume??
Without some pressure gauges and tech information, diagnosis is difficult. Your dealer should have a Tech manual on Service Advisor??
Other than all that, what happens if you steer and lift the rear arms at the same time?
Also what happens if you steer and operate a spool valve??
The transmission oil often looks frothy in the sight glass. It should have JD Hygard or super universal oil in there, nothing else!!
Did the steering fail gradually or suddenly?? Do you have a front loader on it??

 

[Fred au]

Was checked by a very expensive dealer. Does not matter weather wheels are on or off the ground, Using hyguard oil. Can use remote or 3 point linkage while steering no change. So is it ok for the oil to be frothy in the sight glass. Should I be looking at the pump / oil pickup. Oil pick up screen has been checked. Loader is off at the moment. Started intermittent Would be tight for a slight turn of the wheel then come good then over two hours was like it all the time. They did full testing and found nothing wrong. They said 60l flow and 3000 psi. I put gauges in steering circuit, when dead head steering on full lock 2200 psi supply and 2000 on load sense line. Since then priority valve has been replaced under instruction from JD tech support who also wanted steering unit replaced. All they want to do is replace parts on a machine that has only done 2000 hours.

 

[Tractortech]

If everything else works fine, I wouldn't worry about the frothy oil. I assume the level is correct?? Have you had a flow meter in the back?? That would rule out any oil supply problems. Does it wander on the road?? It's rare for the steering seals to fail..
We sold loads of those 5020 tractors and had little trouble with any..

 

[Fred au]

the steering now wherever you leave the wheels turned while driving is where they stay. oil was full but with testing and replacement of parts it is on the low mark at the moment. no one has ever had a pickup pipe crack or dislodge partially

 

[Fred au]

Dealer checked flow I take would have been at remotes ? . I was not there. they said 60l but supposed to be 64l. I would have thought that would be acceptable? .

 

[Fred au]

Checked steering cylinder at full lock with one hose off no bypass. steering does not wander.

 

[Mursal]

Might be an idea to be slightly more open to suggestions and double check that the tests, have indeed been carried out correctly? Just a suggestion, as there is obviously something wrong with the tractor, we are just trying to point you in the right direction, for a cure ...........

 

[Fred au]

I am open to suggestions but I have listed what has been done and what has been replaced. Not leaving too many more things to be faulty is there? Nobody seems concerned about aerated oil or checking oil pump /pickup. I have put the post out hopefully in an area where there is plenty of them. Surely somebody has had the same problem. Dealer done the testing as I thought they would have pin pointed the problem straight away and had test gear. Very disappointed. They don't suspect the pump but I do. Christmas is here and when
I check the oil pickup I want to have a pump on hand. I was living in hope that someone would have experienced this.

 

[Tractortech]

Max. LS pressure of steering system Pressure 18000 kPa
180 bar
2610 psi
Max. steering pressure Pressure 18000 - 19000 kPa
180 - 190 bar
2610 - 2756 psi.
From the TM. Oil at 60°C engine at 1500 rpm, hold the steering against the end stop to test the pressure..
At 2300 Rpm you should have 54 or 64 litres per minute from the rear SCV couplers with the oil around 60°C.. If that's correct, the pump must be good. Also, with a flow meter you should see how much flow there is at 180 bar..

 

[Fred au]

Thanks for that I did it, oil cold at idle steering pressure 2200 psi and load sense 2000psi that was with a new steering unit but at that stage was old priority valve. They said the pump tested 3000 psi and 60l one would hope the flow was tested at 3000 psi by the dealer. Have you ever seen an oil pick up start to leak or come a drift on these models. I am ready to lift the top and have a look but want to have a pump to put in while I am in there. The priority valve has since been replaced under jd tech instructions plus the steering unit so what's left.

 

[Phil P]

Thanks for that I did it, oil cold at idle steering pressure 2200 psi and load sense 2000psi that was with a new steering unit but at that stage was old priority valve. They said the pump tested 3000 psi and 60l one would hope the flow was tested at 3000 psi by the dealer. Have you ever seen an oil pick up start to leak or come a drift on these models. I am ready to lift the top and have a look but want to have a pump to put in while I am in there. The priority valve has since been replaced under jd tech instructions plus the steering unit so what's left.

If you jack the wheels off the ground is it still stiff? Has one of the steering joints/king pins gone tight?

If your pump pressure is right and the flow is there, then your pump is ok. If you pull a scv and turn the steering at the same time does it make any difference?
From memory 5020 series don’t have power brakes so they should affect the steering.

Get some gauges in the steering system and see what’s happening as your turning the wheel, does the steering supply pressure and LS pressure rise as you turn the wheel.

 

[Tractortech]

Now Then....

For information ,,, the hydraulic pump is accessed from the back, take the PTO housing off.....