M-M p3 drill problem

Hello, first post here. i originally posted this on the implement forum but it was suggested to throw it here. i modified it slightly so it hopefully makes more sense than the other post ha

i have a M-M p3 13-7 hydraulic lift drill with one half that works fine. on the other side the feed shaft isn't turning and the gears also are not turning. the problem i believe is the drive sleeve with the two set screws isn't engaging. the axle shaft driven by the main gear turns fine (in other words the grass seeder/fertilizer gears turn fine on that shaft) but the drive sleeve and therefore the double drive gear that engages with the feed shaft gearing isn't turning with the drive shaft. i pulled out the two set screws from the sleeve and one looks to be in good condition but the other looks to be sheared off. so, here are my questions

1 do either of those set screws, or both, actually screw into the shaft or are they simply screwed in enough to butt up to the shaft and keep it from sliding back and forth??? asked another way...is one or both of those set screws the mechanism that causes the double drive gear to turn????

2 according to the parts manual those two set screws/bolts are identical 7/16 x 7/8, which would indicate to me they aren't long enough to screw in but when i pulled them out the one that was sheared is longer than the other. this would make sense as to why the gear isn't turning...its because of the sheared bolt. however the fact that the parts manual lists identical size bolts means the manual is wrong...one would have to be longer than the other for it to bolt into the shaft....basically the parts manual has me confused and has me thinking i might be missing something

3 is there a way to move that sleeve and therefore expose that part of the shaft without taking the entire machine apart?? the way im reading the parts diagram, that sleeve inserts into the double drive gear. i tried sticking a screw driver in the gap between the sleeve and the bracket to tap the sleeve down the shaft but that's not working

anyway, any advice on how this machine works, and how to fix this would be appreciated. thanks

I'm not where I can check my drill and it's been a long time since I worked on one, but I will try to answer. First make sure the feed shaft turns freely. The way I remember the gear is just held to the shaft by the set screws so if one feed cup is stuck it will strip the set screws.

Really appreciate the reply. Dont make a special trip to look yours over as I messed around with it more yesterday. You are correct that the two screws are set screws that do not bolt into the shaft. What threw me off isas indicated the parts manual lists the two set screws as the same part but the two on my unit are most definitely different. One is about 1/8 longer than the other and the longer one is cupped on the tip and the tip on the other is tapered. If that makes sense. I re tightened them real good, disengaged the drive gear from the feed shaft gearing and everything works as it should.

Turns out my real problem isas you saidI have a stuck feed shaft. Played with it yesterday and I hope I dont have to take the whole grain bin off. If anybody has any tricks Im all ears.