Reverse gear pops out of gear

[Calvins66Cub]

So after I fixed the axle seal leak in my 122 rear end, and filled it with new oil, I took it for a test drive, and it still didn't like much reverse load before it popped out of gear. I checked the shifter forks to see they were not bent, and made sure they were tight. I'm now leaning towards a bad gear. Everything else works great, I just have to hold it in reverse when I back my trailer loaded in.

Does anyone have pictures of what a good reverse gear looks like as opposed to a worn reverse gear?

[olds45512]

There should also be detent balls that hold it in gear, have you checked those for wear?

[Yosemite Sam]

You may be right about the worn gear, but before you tear the transmission apart be sure to check everything really well. I would hate to see you go to the trouble of taking it out, then apart only to find that it was something much easier.

The detent balls are in a hole with a spring behind them, sometimes they get rusted in place and don't push out when the notch on the rod is lined up with the hole (especially if they have sat for a long time).

When the transmission is in neutral the shift forks should line up on the top and form what looks kinda like a little box [ ] the ball on the end of the shifter fits in this box.

The forks have a tendency to crack down under the rod that they are clamped to. Often times it is very difficult to see the crack because the rod is right in the way.

If I'm not mistaken, some of the pullers weld the shift forks before they have a chance to break.

I have seen chipped and badly worn teeth on the driven gear before (someone correct me if I'm wrong) but I believe the "slider" gear is the one more apt to be worn or broken than the driven gear.

Good luck with your project.

[Calvins66Cub]

Thanks for the replies. I checked the forks, they seemed ok. The detents worked well. It only happens under heavy load. I was just curious if anyone had a picture of a worn gear.

[austin8214]

Originally Posted by Calvins66Cub

Thanks for the replies. I checked the forks, they seemed ok. The detents worked well. It only happens under heavy load. I was just curious if anyone had a picture of a worn gear.

Pretty normal to pop out of any gear under a heavy load.

[zippy1]

Originally Posted by austin8214

Pretty normal to pop out of any gear under a heavy load.

Really? Pulled some pretty heavy stuff, and never had one of my tractors (pop) out of gear.