MF 230 Hydraulics stopped working

[TJ in KY]

I have a MF 230 (SN 9A255905) that I added rear auxiliary hydraulic outlet to and all seemed fine. I had a small problem with the
crush washers (aluminum that came with kit) kept blowing out. It seemed like the pump was deadheading when I tried it out and the
hose was jumping quite a bit. I was able to get some copper ones and got them to hold.
It still made a lot of pump noise when I put it in constant pumping position. So I got a 5000 PSI gauge and hooked it up and it
pegged the gauge well over 5000 pounds and now it is showing 500 psi with tractor off. (gauge probably off from too much
pressure.)
With quadrant position control at top of quadrant it registered about 3000 PSI and would bleed off and when I moved it to constant
pumping it made a lot on noise and then quit
Is there a internal relief valve on this tractor? Did it break or fail somehow
Do you think the stand pipe maybe gave out. Or o-rings failed. When I pulled the original cover plate off the stand pipe came with
it.
Or did the pump fail. It makes no noise now and the 3 point lift doesnt work now.

I have a video but I cannot get it to load

 

[Harry in Ky]

Take that assembly off, check the standpipe O rings and put the original cap back on. Then see if it works.

 

[Bob N.Y.]

The red part shown in the picture is commonly referred to as a diverter valve. What is at the other end of the hoses? They should be connected to an open center spool valve. Otherwise the system would be deadheading when in constant pumping.

 

[TJ in KY]

Thanks for the tip. I took the valve off and cranked it over and had oil flow thru the stand pipe. . So I put the original cap back on and still no three point lift.
If I remember correctly when I started this project the stand pipe came off with the original cap. And when I put stand pipe back in I could feel it seat inside the hole, and it stuck up above the machined surface. Now when I put the standpipe back in I can push it down flush and that doesn't seem right. I think it should stick up above the machined surface. I think it is time to pull the side plate off and drain the oil and see what is going on. The pto does still work. I will not be able to work on it again till Tuesday. I will let you know what I find out.

 

[TJ in KY]

just goes to standard rear mount couplers. I had a gauge on one of the outlets and that is how I know it worked for a while

 

[Bob N.Y.]

How many positions does the lever on that valve have? Is it spring loaded to return to any of the positions?

 

[TJ in KY]

Raise (to the rear) lower (to the front) spring return to center. The silver knob up is for three point hitch, down is for the auxiliary outlet. I was messing with different positions when it stopped working. Not sure if I had the silver knob up or down position when it quit working.

 

[TJ in KY]

I took off both side plates and drained the fluid. Fished around a little with a magnet and got nothing. My IT manual states that some have pressure relief valve and some don't. AGCO parts book I am having a hard time determining what pump I have. Tractor serial number is 9A255905 and the casting number on the top cover is 1870951M1 (see picture). So my question is is this a relief valve

Also,in the gap between the you will see a gap and no gap under the following conditions.
draft up and position up (top of quadrant) NO GAP
draft mid quadrant and position up (top of quadrant) GAP opens till draft knob is mid quadrant and then no more
draft up, position mid quadrant resting on stop NO GAP
draft up and position at bottom GAP opens from mid point till it is at the bottom.
Also it doesn't feel like anything is moving with position knob from the constant pumping position till it is resting on stop.

Do you think I have a relief valve problem, linkage problem or something else. Any help would bet appreciated.

 

[Bob N.Y.]

That is different than anything I have seen. Does it allow the oil to flow through when in neutral? Does it have a built in relief valve that opens when the remote cylinder reaches the end of its travel?

 

[TJ in KY]

I dont think it has a relief valve. That is why it seem to be deadheading I think the internal relief valve may be bad or broken