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.

[Shrewcub]

Originally Posted by zippy1

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

I agree, Todd. I've had the front wheels off the ground on my 102 and it didn't come out of gear.

[J-Mech]

I never have either. Yes, in pulling it's common, but that is at a much higher rate of wheel speed and RPM. Also, the loading and unloading of the driveline under wheel hop is the greater cause. Under normal loading, it should not pop out of gear.

More than likely it is a detent malfunction. I have also seen the idler gear chip/round off.

Check and make sure that the gear shift lever is not being obstructed in any way. Also, the cup could have broken off the inside (common problem) and be limiting the movement. (Although I would have thought you would be having issues in other gears too.)

Pop the top cover off. Manually (slide the gear with your hand) look and see if it is fully engaging the idler. Make sure the rear bearing is where it is supposed to be. If you don't see anything, you can either leave it and deal..... or tear it down.

[dvogtvpe]

they do pop out of gear easy. I've done a few rears for guys that want plow tractors and their biggest complaint is popping out of gear. depends how bad everything is worn or how bad the forks are messed up. I put stiffer detent springs in and they seam to work out pretty good. R and 2nd usually take the biggest beating and the R fork is usually broken. if you slide the shift rails out and look at them allot of times the detents are worn pretty bad to.

[Sam Mac]

Not the answer you want to hear, sell the 122 and buy a hydro. No gears to mess with.