>>Often they are keyed or have a dowel pin that breaks. The ones I’ve opened on 924’s have a dowel shear pin through a collar on the side of the gear. If you have not opened up your gearbox how do you know the pin is not broken? Is the case cracked? No, from the outside, it looks like new. I started working on it just a while ago, I should know later this evening.
>>Sometimes the gears do break and cases crack but chances are decent it could only be the shear pin. I fixed one two weeks ago on a mid-80’s machine. The gear was fine and plenty of meat on the teeth to last another 15-20 years. The fix was a few bucks but I put in new parts just because it was apart and the parts not so expensive.
Judging from your experience, I'll probably just try to fix it, assuming it's only a broken pin and the gears are in good shape. I'm just a bit soured since this is the second gearbox I've had fail in 3 years, the last time was on a Murray, of course I couldn't get parts. Definitely bad karma.....
For anyone else that might need a new gearbox, I found it at Replacement Commercial Parts Warehouse in Ohio for $182 and change.
