4230 hydraulics

i have a 4230 JD that's having two hydraulic problems. 1st problem is the low pressure line from the power steering metering pump (mounted at the bottom of the steering shaft) and the steering valve (mounted on the engine side of the firewall just above the motor) is blowing due to high pressure after the tractor has ran about 2 hours with a disc mower or baler - doesn't happen if ran at lower rpms. I read from someone's post that the check valves in the steering valve could be worn and causing the high pressure to push to the low presure side so we replaced the steering valve - unfortuntately, that didnt solve the problem. A deere mechanic suggested that the check valve in the metering pump may be worn and when the hydraulic oil gets hot, it passes thru the check valve easier - leading to the bleading of the high pressure side to the low pressure side. PS- the metering pump on this 4230 has niples on the low pressure fittings rather than the JIC fittings that they put on later models.

2nd problem is pressure release on single action cylinders. I have a high-capicity rake which has single action cylinders to raise and lower the raking wheels. The hydraulics work fine to raise the wheel frame, but when i go want to lower the wheels to rake by releasing the presure on the cylinder, the hydraulics do not bleed back to the hydraulic system.

if anyone out there knows what the problem is, i woudl greatly appreciate it. Thanks for the help.

I can maybe help you with your second problem. Does the rake require a real low amount of pressure to lift? You may have to move the SCV ..remote.. lever into the float position to get it to lower. Just looking quickly at the parts book I do not see the little plastic levers that flip up to let the lever go farther forward into float. I know they had them on the 40 series. You should post this in the JD topic section for a little more help on your steering.

30 series tractors do not loke single hose cylinders. I had problems with my 4230 until I bought a plate off a 40 series that goes between the remote and the rockshaft housing. You then need to drill a passage way in the rockshaft housing. I did not know to drill the housing and split a remote valve wide open. This took care of all my problems using single action cylinders. Tom

In your manual, go to page 37, it explains very well how to use a single remote. No manual,go to JD's web site and you view it.

Should of went here instead of the parts manual. In the linked page enter your tractor model. You will choose the manual options by serial number of your tractor. This may not actually change the operators manual. Then the arrow with the bar under it to the right will download the manual to your computer or phone. Cash is correct there is a valve that has to be turned to operate a single acting cylinder.
Deere publications

I would think if one raised lever stop(item 14) & pushed lever forward into float position rake wheels would lower. On leaking steering hose I suggest to replace hose/hose clamps with a high pressure hose with wedged on fittings or steel line with JIC nuts.



This post was edited by Tx Jim on 07/02/2022 at 11:23 am.

Jim, I was hoping you would have more insight on the
PS hose issue. I found a previous post about this issue
on a 4630 I will link it, I did know that Deere had
problems with these. I do not know if you knew poster
Rexhellwig but he certainly seems to have a lot of
knowledge on this. I suppose the OP could try his
email, hate to say it but likely another member who has
went to the big tractor ride in the sky. On the single
action cylinder Cash4toys is right there is some
covered screw that needs 5 turns to operate a single
action cylinder. You are probably correct that float
would work as well. Being that I only side-dabble in JD
land I was not sure if the 30 series actually had a float
position. But I thought it would be odd it would be
dropped in the 30 series and back on the 40s because
I was pretty sure the 20s had it.
Previous YT post on steering issue

No sir I didn't have the pleasure of knowing rexhellwig. I had forgotten about the manual valve that could be opened to operate a single acting cylinder. My 4255 will operate a single acting cylinder without performing any changes

I have run into both of those problems. First the steering hose will blow if the piston in the brick, or the valve on the engine side of the firewall has started scoring or is not sliding properly. There can be other problems in it too. The second problem is that the one-way cylinder is pushing against the tractors charge pressure. There is a valve on the left-hand side that you can open and make the cylinder operate better. Also, I think we used to use the right-hand coupler. But it has been a few years.

Secret Squirrel has the correct answer...