226D Front Drive Always Engaged-pics

[HappyDaze]

Doing some grading in a tight spot the other day, ran the bucket up a maple sapling which lifted the front tires off the ground for a second and while doing so, I noticed the front wheels were in drive mode. Not usually a problem except the lever was in the 2wd position (up).

I noticed then that the lever moved way too easy, so I assume some sort of damage to the innerds. Decided to just dig into it since these tractors are almost fun to work on compared to my Subaru.

So it looks like someone stood on or jumped up and down on the front drive lever at some point when it wouldn稚 move instead of taking the time to engage it properly. Whatever the mechanism of destruction, the outcome was pretty impressive. You can see the peg on the right way down there and the piece it sits on is bent downward probably from the force of it suddenly engaging and rolling past the groove it normally rides in (think getting a tire onto a rim, that last bit seems physically impossible but given the right amount of leverage...and this is steel!) which made some serious dents in the tooth and the hole for the peg that it rides on is out of round and no longer fits on the peg. And the little guy sloshed around in the oil for who knows how many years but it has so many rings and scratches it looks like it came from the somewhere on the front of the Millennium Falcon.

I致e got to say that as much of a pain it is having to repair stuff on this once-pristine machine, getting to see the engineering and thought that went into making it and getting a front row seat to see how it actually works is actually quite rewarding to me. So...understanding exactly how this thing engages the front drive will help me use it properly and cause less wear and tear on it.

That痴 it, no real question or problem (sorry), just wanted to share pics of the inside of what would be a transfer case on a car or truck, but is lovingly referred to as a drop box here.

 

[HappyDaze]

I dig into the front drive case this afternoon so thought I should post pics while I was that far into it.

 

[HappyDaze]

I thought I could just spin that arm around and get it out of there but the shaft is in the way. Can anyone offer experience on getting it out or at least sliding it back a bit to get the shift arm out and straighten it again?

 

[winston1]

You need to remove the drive shaft boot, oil seal and then you will find a snap ring that holds the bearing and shaft. Remove that, then the shaft and bearings should come out. Haven't done it but I believe that is what the parts drawing shows. See figure 47.

 

[HappyDaze]

Thanks for that link. How does the oil seal come out and will I have to damage it in order to get it out? Just want to get another one headed this way in case.

 

[HappyDaze]

I think I got this. I’ll post pics of any progress as I go.

 

[winston1]

Thanks for that link. How does the oil seal come out and will I have to damage it in order to get it out? Just want to get another one headed this way in case.

Have to damage it. Pry it out or run a metal screw in it and pull it out.

 

[HappyDaze]

Thanks for the confirmation, it dawned on me why leave the old one it has served 35 years now and that is probably more than I should ask of it. We will have a new one shipped while I finish the repair.

 

[winston1]

DROP BOX SHIFT ARM _: Yanmar Tractor Parts

 

[HappyDaze]

So I got it down to here, I straightened out the shift arm and now and I’ve got a couple questions.

Are the bearings pressed on to the shaft or will they come off with some soft persuasion?

If not, how do I get the shift fork back in that groove while it’s on the shift lever?

 

[winston1]

Only speculation on my part. If the shift arm will not go in the groove then remove the inside bearing. It should not be that hard to remove. Probably take a rubber mallet and hit on the sliding gear to remove them both. Then put the bearing in the housing, put gear and shift arm in proper places and start sliding the shaft through them. Things should tap in without unusual force until outer snap ring slot is showing enough to install the snap ring.

 

[HappyDaze]

I can confirm your speculation. A few taps and it started sliding off. Thank you.

Got to the part where I have to hold two steel balls with a spring between them and tap the shaft with my third hand...long day so I gave up until tomorrow. Good news is I cross referenced the shaft seal part number and Napa had it, for about 1/2 what my local Yanmar dealer can have it ordered and shipped in.

 

[HappyDaze]

Had to heat up the shift arm and bend it out further than I had already in order to get the proper engagement. The detent was tricky but I used some grease to hold the bbs in place while I tapped the shaft end with a rubber mallet. Then tapped it the rest of the way in, put in the snap ring, and persuaded the seal into place. I made sure the shift handle was on the correct way and drove it on the shaft so I could insert the roll pin and call it a night. I will finish the install tomorrow afternoon.

I have to mention that it bent the shift arm and all but wrecked the shift block while it was being forced into front drive that fateful last time when the whole works finally succumbed to the abuse it was being given. But the roll pin adjoining the handle and the shaft, those things must be incredibly effective. The holes through the handle and the shaft were not rounded or disfigured, and the roll pin showed no sign of any trauma.

 

[winston1]

Looking good! :thumbsup:

 

[HappyDaze]

Thank you for your guidance and encouragement Winston1, very much appreciated. This is one more part restored and on the way to being the true beauty it once was. Amazing to wonder how long it would have continued to serve under the conditions it was in previously. Possibly years before it became unuseable and had to be serviced. It was stored indoors pretty much the entire time since new and that may have been its saving grace but hard to tell.

Here’s a shot from its younger days probably 1985 or 1986. I noticed that is actually the loader that came with it, I do not know the brand of it but along the way someone has fabbed a brace to secure the loader to the back axle which completely blocks the suction filter from being removed and replaced. And of course it is welded to the fel brackets that run perpendicular under the bell housing, which means the entire loader must be removed or at least detached in order to perform maintenance that is otherwise very simple. Ah well, watch for more photos and rambling paragraphs from me on that someday soon.

 

[HappyDaze]

...and I did the one thing I was absolutely not supposed to do. I took care not to, I thought. I lost a bb. The drive shaft looks like it had somehow come undone in the front and spun freely inside the tube for a bit. It was together and the front drive was working fine when I took it apart. The previous owner had it worked on by a questionable mechanic. Not sure how one would accomplish that unless they were working on it. So who is to say that there were six bbs in one end to begin with.

Here are some pictures, I cannot imagine anything else causing that type of damage in that particular spot. Definitely odd though.