hyd control valve on 3 pt

[clemsonfor]

There is a spring and a ball bearing and then a shaft inside behind that big nut. The spring is not powerful and as long as your aware that it will come out when that last thread on the nut comes off you can easily hold it without any real effort and then just ease it apart watching how the pieces come out. I had a part fall out of mine when I took it apart cause I was in a hurry and could not figure what was wrong, I think I had the shaft thing or something in backwards. I pulled it apart several times thinking the oring was cut and I kept swapping them and looking, the diagram was not clear enough for me, finially I figured it out and swapped it around and got it back working right. Yes I did drop a piece, but I didn't know what was in there and I was rushing taking it apart, but each subsequent time when I pulled it apart there was not problem or remotely close to loosening a piece cause I was ready for it.

 

[kenmac]

They guy I talked to at fredricks said they sell a good many of these valves. So , I guess they go bad often.
I had no idea they had them made. I thought they were original yanmar stock

Winston, I will see if I can check this relief. It appears to be located under the big knob. I don't really know what I would / should be looking for in the relief to determine if something is wrong there ,or not

 

[clemsonfor]

Like I said mine leaks down a little when the tractor is off, but not near bad enough for me to want to spend $250 on it!!

 

[winston1]

Relief valve could have trash in it or a broken spring. Probably not, just thinking how fast you are leaking down sounds a little unusual for a control valve to leak that bad. Also, costs nothing to check.

Another edit. Going back to your first post stating high rpms to have loader function sure sounds like pump is going bad or suction stopped up. Your 3 point relief valve is down stream from your loader. But then again, the 3 point should not leak down that fast. Did this all happen pretty suddenly or over a long period of time?

 

[careyo63]

A pump works or it doesn't. Along with a spring breaking "So rare it Don't happen" and For another edit I brought up that the Suction "Pickup Screen was Dirty". On #2 post. It is almost more than apparent this is a Winston and Kenmac Thread. And one of you doesn't even own a Yanmar that he apparently couldn't keep up With LMMFAO........

 

[winston1]

Careyo63, I meant no offense by stating what you had already stated. My only intention here is to offer suggestions as they come to me. No idea what LMMFAO means. This is post #26, Kenmac leads with 10, his thread so sounds good to me. You come in second with 7 posts. I have 5 posts counting this one. Clemsonfor has 4 posts. Guess I need to post faster to catch up.

 

[kenmac]

winston, My system doesn't have the B like in the link you posted. I assume the B is where you are indicating the relief is. There is nothing under the big shut off screw.
My filter screen is clean. Since I've had this tractor, I changed the hyd oil, Last yr I changed over to Transmission fluid.
I shut the big knob off and the 3 pt holds.

At idle with big knob all the way out. the 3pt will drop. It will raise back up at about 1500 RPM

I think I solved the slow loader issue. When The tractor is first started in the AM. loader speed is great. It seems like I lose some loader speed after using the tractor for several hrs straight. I think the oil is getting hot and thinning out causing me to have to run higher RPM to get the same flow. I think I'm going to experiment with thickening the HYD fluid some (maybe add some STP) and see if that helps with the thinning of the HYD oil when it gets hot.

Clem, I intend on keeping the tractor even though I'm looking for a larger (50-55 HP) tractor . So, I may as well have it working right. I think they have those valves made in china. Probably why they go bad so often. LOL

Carey063, I have no idea what you mean by a kenmac/ winston thread. I have read and appreciate all the comments. I didn't comment about the dirty suction ,because I know it's not dirty.

 

[careyo63]

How do " You Know it's Not Dirty". What you are saying is your pretty sure you think it's not dirty. You haven't checked it so your Guessing it's not dirty or clogged.

 

[kenmac]

How do " You Know it's Not Dirty". What you are saying is your pretty sure you think it's not dirty. You haven't checked it so your Guessing it's not dirty or clogged.

I'm so positive it isn't that I would be willing to bet it's not.

For enough trash to be in the hyd system to stop it up, It would have to get in there from some outside source. It isn't just going to clog up from the transmission fluid and alone.

A few metal shavings on the filter ? Maybe, but fluid was replaced and filter cleaned within the last couple of yrs
I have replaced transmission filters on vehicles with over 100 K . Those filters were almost like new

 

[careyo63]

Your Guessing!! Water,Rubber,Metal,Gasket material, All of these things could do it. What are you out to check it. To much for you to handle doing it? Then you can rule it out. If it's all good pour it back in.