Slipping clutch or Powershift Yanmar 226d

Post your questions or problems you are haviing with your Yanmar tractor here.

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Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Thu Oct 30, 2014 11:59 am

Cleaned it last year. Cant imagine I have over 60 or so hours on it. Hour meter does not work. But it is worth a check.

Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Thu Oct 30, 2014 1:08 pm

Found the Regulator Case finally. The book said it was on the upper side of the transmission when it was on the top front under the metal cover just below the steering wheel. I ordered a pressure gauge and will go through the procedures in the manual. since the pictures in my manual are black I will list the items below as I see them.
1. Valve Spool
2. Main and Delay Relief Valve
3. System Pressure test port
4. Lubricating Pressure test port
5. Second Relief valve must be under this item. (Do I need to take this off to access it and is it necessary?)

Is there a procedure for cleaning or checking these items? What am I looking for here?
Attachments
Regulator Case.jpg
Regulator Case
Regulator Case.jpg (148.95 KiB) Viewed 6960 times

winston
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Re: Slipping clutch or Powershift Yanmar 226d

Postby winston » Fri Oct 31, 2014 4:18 am

email me so I can share something about your relief valves.
Last edited by winston on Sun May 19, 2019 5:46 am, edited 1 time in total.

Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Sat Nov 01, 2014 3:08 pm

Found the issue. After removing the Plate that holds the Relief Valve, I used one of the screws for the plate to pull the valve holder out of the regulator block. As you can see the inner spring is broken in several places. From what I understand the parts that I have taken out are the DELAY RELIEF VALVE and the MAIN RELIEF VALVE is further in. I don't see a way other than trying to pull it out with needle nose to remove it. Since I think I found the problem I don't want to push my luck. Now to find the parts. Comments and advise are welcome.
Attachments
IMG_0124.jpg
Relief Valve 2
IMG_0124.jpg (66.16 KiB) Viewed 6931 times
IMG_0123.jpg
Relief Valve 1
IMG_0123.jpg (88.5 KiB) Viewed 6931 times

Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Sat Nov 01, 2014 3:09 pm

Broken Spring
Attachments
IMG_0134.jpg
Broken Spring Relief Valve
IMG_0134.jpg (101.06 KiB) Viewed 6931 times

winston
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Re: Slipping clutch or Powershift Yanmar 226d

Postby winston » Sat Nov 01, 2014 3:34 pm

this is your spring. http://www.hoyetractor.com/PROD/search/194446-24550.htm Find the part number you are interested in your parts manual, then go the the parts page, hit search and type that number in that field. Make sense?

Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Sat Nov 01, 2014 7:34 pm

Already have it ordered. Thanks to you all. Can't stand looking at my tractor sit. I hope this thread helps out someone else.

Drewman
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Drewman » Mon Nov 10, 2014 9:59 am

Received all the new springs,o rings and replaced. The powershift works better than it ever has. Issue fixed. Thank you everyone.

Hdmike444
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Hdmike444 » Sat May 18, 2019 7:57 pm

Hi all,
I saw this thread and think I may have a similar issue. When my 226d gets hot or maybe I just noticed it getting worse after a lot of use today, it seems like it is really delayed in shifting and having power especially in reverse( feels like a slipping clutch)My first question is if I open the same valve and find my springs aren’t broken does that mean it is most likely a clutch? Any other things to check. If it is the clutch what is involved is repairing it?

Hdmike444
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Hdmike444 » Sat May 18, 2019 8:18 pm

Also if you remove the spring as you did and it’s not broken is it as simple as pull the spring assembly out and slide it back in?
Thx mike

Norm
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Re: Slipping clutch or Powershift Yanmar 226d

Postby Norm » Sun May 19, 2019 9:28 am

If PTO works normally with a load, clutch good. Just re-assemble the assembly.

winston
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Re: Slipping clutch or Powershift Yanmar 226d

Postby winston » Sun May 19, 2019 12:25 pm

If I am understanding correctly you are thinking your powershift is at fault here. I would start with the regulator case relief valve springs that are shown in drewman's pictures. Also be looking for trash in there. The outer spring free length should be 2.54 to 2.57". The inner spring free length should be 2.13 to 2.16". You may want to check your power shift pressure if you find nothing amiss with the relief valves.


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