Their theory at the time was to much gear endplay on the output shaft. What we did then to correct it was replace both driver and driven gears, add shims to lessen gear endplay. We had only a few that had this problem occured on, for the most part the later white 24's never bothered. When the 90's came out CASE added hyd pressure to the detents and changed the teeth on the hub that the shift collar engages to hold it from slipping out. The older ones have the same shift fork detent set-up as the 1370,s where it is easy to install new springs, I think on the 24,s that shiftfork cover is covered up by the main side frame which would make that job almost impossible without tranny removal. If yours only comes out of gear after that long of time I would not be too concerned. However it is not good to let them do that, it seem like if they are left to continue doing so they create a wear pattern and the jumping out slowly gets worse. Maybe a light spring could be added to keep the weight of the lever from trying shift it out or every so often just moving the lever to make sure it is still fully engaged. Hope this helps, Rod.
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