Hi Koehn, a few things to check out: Is the Hi/Lo/Rev linkage worn and sloppy? Has the sheet metal around the shift levers been bent or mispositioned. There are adjustments on the shifter rods. Sometimes the shifter lever that goes into the transmission case can become twisted or even snap off.
The next time it appears to pop out of gear try pushing it into gear without touching the clutch and listen for gears grinding. If there is no gears grinding then maybe it is the T/A disengaging. My brother has a 684 and the T/A would unlock on it. Sometimes to get it going again had to put Hi/Lo/Rev in Neutral depress and release clutch a few times and then it would work again. We had replaced the clutch about a year before. He had the T/A replaced with an eliminator shaft. That fixed the problem.
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