YM 2700 threepoint control valve

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Curtainrod
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YM 2700 threepoint control valve

Postby Curtainrod » Mon Sep 07, 2020 6:39 pm

Hi My Recently Purchased YM 2700 with loader had inoperable 3 point and the loader, I removed the 3 point control valve/piston assembly, and cleaned , replaced "O" rings, and now the 3 point works but not the loader.
The issue I am having is the 3 point control valve/ piston Assembly has 2 ports on it (picture attached) the upper port is the port from the hydraulic pump to the control valve/piston assembly, the lower is feed to the loader , I am NOT getting any pressure /fluid from this fitting,
In the valve assembly there are 2 adjustable spring loaded (possible relief ?) valves that screw into the control block on top of another valve with spring, How are the adjustment made to these? Also some insight into what the valve just below the loader control valves function would be appreciated .It is in the pressure supply line right below the loader control valve.
Attachments
20200907_192711.jpg
Shut off Valve??
20200907_192711.jpg (113.51 KiB) Viewed 414 times
20200907_185206.jpg
Three point valve line connections
20200907_185206.jpg (42.42 KiB) Viewed 414 times

winston
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Re: YM 2700 threepoint control valve

Postby winston » Tue Sep 08, 2020 10:34 am

I have never seen one plumbed like yours. The most common way is to go from pump to loader valve and then from loader valve to three point. That is unless you have power beyond but let's not go there yet. https://www.hoyetractor.com/loaderinstall.htm

Loader valve have a name and model number? Or loader?

Having said the above I will go on to say the 2700 3 point is quite different than most other grey market models.

Curtainrod
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Re: YM 2700 threepoint control valve

Postby Curtainrod » Tue Sep 08, 2020 5:36 pm

Hi Winston,
Thank you for the reply. The loader valve has the name "SANYO" on it . No model number found on loader valve either. I don't find any labels or tags on loader with name it is the same green paint over red as the rest of the tractor.
at this point I am unsure as to loader valve condition as I am Not getting any oil feed to it from the 3 point control valve.
Attachments
20200802_131608.jpg
20200802_131608.jpg (54.04 KiB) Viewed 398 times
20200908_182145.jpg
loader valve
three point valve assembly
20200908_182145.jpg (72.69 KiB) Viewed 398 times

winston
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Re: YM 2700 threepoint control valve

Postby winston » Tue Sep 08, 2020 5:58 pm

I am not at all familiar with the 2700 3 point control valve. As I said last post, I have never seen one of these Yanmars plumbed the way yours is. Maybe Aaron has some knowledge on this. One would think that yours must have worked as it is plumbed at one time, but then again, pure speculation on my part.

Question, assuming the line leaving your 3 point valve and going to your loader did have flow then there would have to be a discharge line from the loader valve. Where does that discharge line go?

Curtainrod
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Re: YM 2700 threepoint control valve

Postby Curtainrod » Tue Sep 08, 2020 6:20 pm

Discharge from loader goes to an adapter under seat at fill point for tank
The adapter is very similar to the Hoye part # HHA-33

winston
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Re: YM 2700 threepoint control valve

Postby winston » Wed Sep 09, 2020 4:41 am

I am at a loss in giving advice on you current plumbing.

Does your loader have only 6 hoses? In an out and 4 cylinder hoses?

Come on Aaron, gives us some knowledge here!

More thoughts. This is out of the 240 hydraulic book. I know your 2700 is somewhat different but I am thinking someone has plumbed it similar to this. Carefully read the instructions on how this is suppose to work and be careful not to dead head your system
2020-09-09-061140.jpg
2020-09-09-061140.jpg (152.81 KiB) Viewed 381 times

Curtainrod
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Re: YM 2700 threepoint control valve

Postby Curtainrod » Wed Sep 09, 2020 7:51 pm

Good evening Winston ,
Update I have oil flow now to loader control valve as witnessed thru the return adapter,
When trying the system as described in the diagram you sent it seems to be pretty close to what my system use for hydraulic control.
Here's what I have discovered, when the 3 point lift is moved to what I think is "neutral position" I have increased flow thru valve, When the levers on loader control valve are actuated the return flow stops so feel the valves are functioning , I close the stop valve as described and slightly move lift control lever, Immediate increase in oil flow ,move lever slightly back to "neutral position" actuate loader control valve, no movement, increase 3 point lift lever slightly actuate loader raise lever " POP" blew out "O" ring at pressure supply line on pump and forced one bolt to pull threads,, will remove pressure line tap threads in pump and replace "O" this weekend if (possible to).
I am at a loss as to how this dang thing works!
I am not able to ask previous owner as he is deceased, Bought from his son who said he thinks his dad ran it out of hydraulic oil and it quit working, It was low on oil when bought , filled it before any work tested pump for flow to valve was pumping so disassembled valve cleaned "O" ring debris (as pictured) replaced all O rings, and now am at a total loss,, I feel at this point it is Just a matter of not knowing how to operate the dang thing!!
In answer to your question on number of hoses to loader yes 6 , 1 pressure in , 1 return, 2 lift cylinder, and 2 bucket
It is now on hold till the weekend!
Attachments
20200905_125506.jpg
debris in valve
debris in valve
20200905_125506.jpg (95.17 KiB) Viewed 372 times

winston
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Re: YM 2700 threepoint control valve

Postby winston » Thu Sep 10, 2020 5:08 am

I would recommend you completely change your plumbing just like this drawing shows. https://www.hoyetractor.com/loaderinstall.htm

Curtainrod
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Re: YM 2700 threepoint control valve

Postby Curtainrod » Sat Sep 12, 2020 5:19 pm

Winston,
Thanks for the input and help Loader now working with original plumbing!
After Repairing the threads that pulled out on pump, refilled system , following the diagram you sent loader is now working just have to pay close attention to stop valve ,and fast/slow return valve MUST be open,, as well as "neutral " position on three point lift lever.

winston
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Re: YM 2700 threepoint control valve

Postby winston » Sun Sep 13, 2020 5:39 am

Glad to hear it is working for you. Yours is the first I have seen plumbed that way and I really expect it will be the last. Although my old 2002D was a little different it also had an outlet like the attached one and yours. I did use it to power a single acting cylinder on a 3 point cement mixer.
Attachments
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100_3554.JPG
100_3554.JPG (133.83 KiB) Viewed 339 times


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