730 transmission puzzle

[Harold Smith]

I have a 1964 730 Eagle Hitch high tin.
When in reverse for a while the fork for 1st, 2nd will at times move out of the detent enough so that when I take it out of reverse I can’t get over into the forward gears.
Took cover of saw that, though maybe I just wasn't carefully getting it in neutral before shifting to reverse. NOT, still does it. Opened it up again. All detents hold well, all gears slide freely on shafts.
Don’t mind tearing it all down but don’t even know what I’m looking for, and if someone has experience with this might save me a bunch of time.
I like it when I open something up, take a look and say THAT’S the problem.
Thanks in advance.

 

[J. R. McVay, Sr.]

I had a 800 Case for about 10 yrs. It started doing what you said that your's is doing. I took the cover off two different times and couldn't find anything wrong. It would go for awhile and then start doing the same thing again. What I found wrong was the bushings in the reverse gear had froze to the shaft. I took the shaft out of there. You can't buy the bushings by themselves. I went to a bearing house and bought bushings to fit in the gear, pressed them in then put in the lathe and bored the bushings to fit the shaft. It worked perfect ever since.