YM226D Power Steering Rebuild

[California]

Have you tried adding some power steer stop leak?

Wouldn't help. Look at Smoody's photo in post #20. What leaks is an air vent beyond the little piston in the upper half of that aluminum casting. Fluid is getting past the worn piston ring, an ordinary rubber O-ring, in that upper cylinder. Plugging the air vent would mean the piston couldn't move deeper into its cylinder.

That little upper piston is moved forward/back when you turn the steering wheel. It uncovers hydraulic ports, in the same way that moving your loader control lever uncovers the up/down ports.

 

[clemsonfor]

May have to cut the castle nut off if you cant get an impact to take it off?? You may be able to tap that thing but I don't know without really looking at it. If you have fab skills there is something that you can make work or someone you know that can. I would think that something could be made to work. Can JD not get the part? How about Kubota what does theirs look like? Or can you put it all back to manual or use the hoye add on PS kit?

 

[California]

Just to get it back to the shop you might chain the pitman arm - either side- to make it steer where you need to go. Stop every few feet and adjust as necessary.

 

[clemsonfor]

Double post

 

[clemsonfor]

Ok I just re read California's post about it not being a yanmar part so that would cancel out yanmar or probably JD.

I think a good shop or old school mechanic that works on that stuff or some guy that restores tractors could rebuild it.

 

[California]

3. I can't seem to remove the old tie rod castle nut, it spins the entire shaft going into the ball joint, whats the trick?

I attached a photo to help with my questions.

Thanks!View attachment 476547

After you get it back to the barn - if nothing works to get that nut off then here's an idiot brute force solution that might work:
Take a portable band saw with the best blade(s) you can find and saw that shaft off above the arm it is bolted to.

 

[California]

And - looking at your picture reinforces my fear of trying to dis-assemble mine. It appears your tie rod lock nut was tightened too much, sucking the tie rod out of the soft aluminum valve casting. At least that can be repaired with a heli-coil (spiral thread assembly repair kit) threaded into the damaged casting by a machine shop.

To do that will need some kind of a vise to hold the valve body. If possible I would like to see a photo of the vise or whatever is used to steady the valve casting for that boring, since that holding device is also needed to get the cap off the opposite end of the aluminum valve casting, which is the first step to replacing the seal in the upper piston.

 

[Smoody]

Update..I was able to remove the castle nut on the tie rod by using a C-clamp to pull the top of the ball joint down, the shaft is tampered and downward force pushes it into the hole, after soakng it in wd40 I was able to remove the castle nut.

California, the threads on the inside of my power steering cylinder aren't aluminum, it appears there is a sleave of steel inside the aluminum casting that was then threaded.

Luckily, the threads inside the power steering cylinder aren't stripped, rather it is the threads on the ball joint that are stripped, I was able to get about 4 threads to catch onside the cylinder and was able to drive it back to the shop.

I have a new ball joint on the way, I was able to determine the hydraulic elbow fitting I needed was 3/8" standard thread, or as the hydraulic shop said, #6 hydraulic elbow.

I am taking the power steering cylinder to that shop for the owner to look at it and tell mW if he can repack it. He said he has experience working on those from many yanmars some 20 year or so ago. If it turns out I will give you guys his contact info.

Thanks everyone

 

[clemsonfor]

We're there that many yanmars in your area 20 years ago??? I see very little three digit yanmars around here that were US models.

Did you use the c clamp like a pickle fork, like the things that you use to seperate ball joints or tie rods?

 

[Smoody]

We're there that many yanmars in your area 20 years ago??? I see very little three digit yanmars around here that were US models.

Did you use the c clamp like a pickle fork, like the things that you use to seperate ball joints or tie rods?

I have no idea, he didn't go into detail, but he knew exactly what cylinder I had on it without me telling him.

I used the C clamp to pull the top of the ball joint down into the hole on the axle arm its connected to. There is just enough clearance for the c clamp and to get a #17 metric wrench around the castle nut, time consuming but it worked.