Zen-noh Yanmar 22-24 transmission problem

[ibldrc]

Any parts available yet? I hope it doesn't ends up getting put back together with the bad gear. And other things come to find. Or a parts tractor. Nothing of the two in my area 22-24.

The first gear I found in the front will be an easy fix. I'll weld it up and reshape it.
Maybe the same for the one tooth on this rear bottom left as well, but I have to source one gear for sure.
It won't go back together with a broken gear, it simply does not move the way it is now.

 

[ibldrc]

for future reference.
the front half of the tyranny is called the shifting shuttle. the rear end that houses the wheels is called the tyranny. (only in tractor talk)

Thx for that! It's going to take some getting use to for sure! My tyranny is confirmed busted, and my shifting shuttle is slightly damaged!

 

[ibldrc]

update, I got some more disassembly done. I tried to split the back half, but something is still holding it together. PTO shaft is free, but this shaft on the upper LH side seems to be the culprit somewhere. No idea where it would split. Any suggestions? Also, these gears that are stripped, they are controlled by a lever, 2 position, engaged, and not engaged. No clue what it's doing mechanically, and While I do know it's a problem that needs to be fixed, I'm not convinced that this is my broken link between wheels turning vs not turning. Seems like a very weak link to control the entire drive train.

 

[spokane 1]

update, I got some more disassembly done. I tried to split the back half, but something is still holding it together. PTO shaft is free, but this shaft on the upper LH side seems to be the culprit somewhere. No idea where it would split. Any suggestions? Also, these gears that are stripped, they are controlled by a lever, 2 position, engaged, and not engaged. No clue what it's doing mechanically, and While I do know it's a problem that needs to be fixed, I'm not convinced that this is my broken link between wheels turning vs not turning. Seems like a very weak link to control the entire drive train.

just keep looking for bolts between the front shuttle and the rear differential. the atv silicone they use at the factory is unbelievably sticky.
brace the rear tranny on a floor jack and the front shuttle should be on a wheeled tranny jack. once your convinced all the bolts are out? wheel 2 bolts part way back in a grab a pinch bar and pry the 2 apart.
sometimes lifting one jack while dropping the other works too. the bolts help so rapid separation and drop does not occur.

I would ace the idea of rewelding a tranny gear ,,,its just to dicy these are flame hardened gears and thousands of pounds develop at each tooth.
yanmar is a bit of a struggle to find parts for but keep looking. They have them.

the part that has 3 teeth missing is this a final wheel drive or a pto drive?

 

[winston1]

I believe the broken gear you are showing that is mounted on the flange is your creep gear configuration. If the shift goes to a lever located down low right next to the left fender I am even more confident. Note the lever in the attached picture. Might read post #4 in this old thread. http://www.tractorbynet.com/forums/yanmar/120507-fx24d-2220-a.html

 

[chriswheeler]

You haven't talked much about the material these gears are made from yet. Of course, it would always be better to buy a new one from Hoye or Fredricks if you can. Last resort is if the gear is made from cast steel, a good welder can undercut and tig weld up the broken teeth, re-cut the gear teeth. I've done this many times while still working as a machinist, job isn't to hard. If properly cleaned, undercut, tig welded, and then re-cut, this type of repair is almost as good as new. Key to having it work is a good clean part to start with, and a good welder, easy job for the machinist. No the repaired tooth ( teeth ) won't be as strong as the original heat treated ones. When there are more than a couple of teeth together, failure rate of this type of repair is high. This is always a last resort fix, go with a new, or good used part from a wrecker if you can.
Chris

 

[ibldrc]

I believe the broken gear you are showing that is mounted on the flange is your creep gear configuration.

Perfect, that's exactly what it is, thanks. That handle was stuck, and it was in creep mode when it failed. I've been able to slide the shaft gear into place, and I now have the front end driving the back end through all gears (turning crankshaft manually), but there's still something binding somewhere up front every 2nd or 3d revolution. I'll disassemble the shifting shuttle and inspect everything. I still need to gain access to the 2nd gear (the first one I found), remove, and either repair or replace.

So if parts are not available for the creep gear (accessory item), I could put this one back together until I found the gears for it.
The cases have since loosened up after sitting for a few days with a good shot of aerokroil to them. With the creep gear assembly removed I can now see there's still PTO gear levers in place too that are in the way of splitting.

 

[chriswheeler]

I'd be looking at Boston Gear, ( they are on line ) see if they have a stock spur gear and a stem gear to match your parts. Can't tell from the pictures, but they make and have both 20 and 14 1/2 degree gears in stock. Having a machinist combine the 2 parts gives you a new part to install. That many broken teeth in a row would make welding this gear a no go for me on this one. Also looks like cast iron.
Chris

 

[ibldrc]

I got some work done this week. Tractor is split in 3 and found lots of broken stuff. PTO gear, PTO shift fork, 2nd gear, and both creep gears is the total. Looks like someone didnt know how to shift it, tried to force it, and once the fork broke the parts took out the gear teeth. Creep gear could have happened on it's own. It should have worked normally as long as it wasn't engaged.
Aaron did some research and said the F22 did not give the creep as an option, and based on the engine size he's determined it to be an F24. Good news I suppose, bigger is always better right?!

 

[winston1]

Yikes! Your not the guy who is afraid to tear into something. Hoping you can find the needed parts. :crossfingers: I appreciate your pictures and keeping us informed.