Yanmar YM186 Power steering problem

[mnoonan]

I have a YM186 power steering unit that only wants to steer to the left. Has anyone had this problem before and what would be the cause?
By the way, this is not on a Yanmar tractor, it is on a custom garden tractor project.
Thanks,
Mike

 

[careyo63]

Any Pics. of it. Is the Steering shaft extended all the way forward or back ?? Usually should be in the center Forward R. Backward L.Etc.. Just A Guess

 

[winston1]

May not help but the third and sixth posts in this thread has a layout of the 186 power steering set up. http://www.tractorbynet.com/forums/yanmar/218151-anyone-have-pics-power-assisted.html

 

[Pete Judd]

Wow, I did not know that power steering was an option when these were sold. I just went through the 1981 printed 186/d manual, and can find no info on power steering.

 

[winston1]

I have a YM186 power steering unit that only wants to steer to the left. Has anyone had this problem before and what would be the cause?
By the way, this is not on a Yanmar tractor, it is on a custom garden tractor project.
Thanks,
Mike

Any findings on your problem?

 

[mnoonan]

Winston1,
No findings just yet. The shuttle valve "Driver Assy" pulls out (to turn left) much easier than trying to push in (to turn right). I plan to take the whole unit to a hyd. shop to take apart and see what's wrong. It will turn to the right by exerting more force on the shuttle valve. In my earlier question, I was hoping to hear if anyone else had this problem and how they fixed it. I have attached a picture of my installation. Do you have any recommended place to get parts? Thank you, Mike.

 

[grainger12002]

looks like a flat head ford......r u working on a old ford v8 conversion ?

 

[kenmac]

Strange looking ym186 :laughing:

 

[winston1]

No recommendations for parts. I'm thinking a good hydraulic shop may have access to any seal parts you might need. Since this was sold on American sold Yanmars you could contact Yanmar dealers but I am doubting they still sell these parts. Keep us informed what you find out. Got more pictures of your project?

 

[mnoonan]

Fellas, this is Case garden tractor model 226 repowered with a 1949 Ford flathead V8 and customized with Allis-Chalmers "B" sheet metal. It is near done but with a few issues to resolve, one being this power steering issue. This thread started out with the following earlier thread;

http://www.tractorbynet.com/forums/yanmar/227846-yanmar-ym186-power-steering-question.html

Thanks, Mike

 

[kenmac]

is it possile there was a problem with the unit b-4 you got it ?

 

[mnoonan]

is it possile there was a problem with the unit b-4 you got it ?

Yes, I believe it was this way before I bought it, that's probably why it was at a salvage yard. I don't know it's history.
One other thing I don't think is right, It takes a lot of force to push or pull the shuttle valve, maybe 50 pounds +/- and to me, that seems to be a lot.
Without taking it apart my guess is there is probably some bad O-rings inside.

 

[Pete Judd]

Frankenyanmar?

 

[JCByrd24]

Have you tried the valve without the linkage in place, it certainly isn't helping anything.