mm 5star power steering control valve gaskets?

chrisaukcam · Sep 24, 2020

I have a leaking power steering control valve on my MM 5 star (1959). It is located on the tractors left front. I took it off and see where a rubber seal has bulged out and the fluid is leaking. I figure that I might as well replace both rubber gaskets and the o-rings while I have it off. Where is a good place to find replacements at a decent price, or would a dealer still carry these?

Ronnie Budd · Sep 25, 2020

Try calling Welters Farm Supply. 417-498-6496. Their phone stays pretty busy, so don't give up.

chrisaukcam · Oct 8, 2020

Thanks for the tip on the gaskets. I called and got the gaskets fairly quickly. But when I put it all back together, the leak was fixed, but now the
tractor won't turn to the right. So I must have done something wrong when I put it back together. Any ideas on what to do?

MMDEL · Oct 9, 2020

The mounting holes in the valve are elongated. the valve can be adjusted forward and back. A minuet movement will make a big difference. Snug the bolts on the valve and tap with a hammer one way or the other till the steering is the same in both directions. Technically if you remove the cap on the back of the valve, when steering is in neutral the valve should be flush with the housing. When you turn in one direction the valve will protrude out. And in the other direction it will be drawn into the housing. The measurement from flush (face of the housing) to the end of the valve should be the same in thousands in both directions. Tighten the valve body down and recheck, sometimes it will change and you will have to compensate.
MMDEL

chrisaukcam · Oct 9, 2020

I am attaching some pics of the unit so that I can be sure that I understand what you are telling me. I understand that there is a valve that needs
adjusted. I am just not sure of the location of the valve.

Also I don't know if this is a factor or not. But I went back out and cranked up the RPM to see if that made a difference on the turning. Seeing if
more pressure would do anything. The unit began to leak hydraulic fluid again - in between the base of the unit and the engine.

Parts diagram from manual. Can you point out the valve that you are referring too?

The 2nd time I tried it leaked hydraulic fluid where the unit bolts onto the engine. Maybe try making a rubber gasket?

The rest of the pics are of the the unit where it bolts onto the engine.

MMDEL · Oct 10, 2020

First off lets get our terminology and parts identity straight so we are talking about the same thing and comparing apples to apples.
No way are any of these parts or any of the front end steering attached to the engine.
#5 in the parts breakdown you are showing is the valve body assy. That is the part that has the elongated holes. The 4 bolts that hold it on are the ones we are talking about to loosen and adjust the valve body back and forth. It is bolted to the worm gear housing. #6 is the plate I was talking about to remove and measure the movement of the valve spool in and out.
As far as your leak, there should be no hydraulic fluid between the valve assy. and the worm gear housing. Did you replace the O rings on the valve spool?
MMDEL
By the way I will not be back to this site till MON

mm 5star power steering control valve gaskets?

chrisaukcam

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