D8 2U pinion problem

First you will need to determine if the pinion latches are operating (or stuck). Also could be a broken return spring and/or stuck plunger.
Depending on serial number there is a small access plate on top of the clutch housing to observe the pinion or on the older units you have to take take the pinion engagement lever housing off the flywheel housing, then the can that covers the pinion latches to see what is going on.
Adjustment is similar to all the pony units. After removing the cotter pins a half turn of the adjustment screws changes the rpm by 100 to 150 rpm but you don't want to change that until all other possible problem sources are checked out.

Just had the pony, transmission and pinion all off the tractor, checked the latches while it was out and they are all fine, well, not stuck anyway. Everything is free, so I'm sure its adjustment. Question is this....when I remove the cotter pin from the nut and pull off the "can" there are four small bolts with locking tabs, that you bend into place. when the pinion was off the tractor those bolts were loose, so I tightend them up and reassembled the unit. NOw...that looked to be where the adjustment for the release speed is at, because there were a couple extra holes you could put the small bolts in that allows you to turn the "adjuster" just a fraction of a revolution. Am I looking at that correctly?

Thanks,

Scott

I forgot to mentionthe S/N is D8 2U 405

Those extra bolt holes for the sleeve are to be used to get proper alignment between the stop for the latches and the "double D" shaped stop itself. Should grip the round portion of the stop as straight on as possible. I've actually had to shim the threaded stop in some cases to get the best alignment.

Loose sleeve attachment bolts are not a good sign as once they get loose they tend to wallow out the holes, never to be right again no matter how tight you get them. Loctite will sometimes help but once they get loose it usually leads to problems. This is the weakest point of all the pinion arrangements.

The only adjustment is for release speed as previously mentioned.

Have you tried manually releasing the latches....bump the adjustment screw end of the latch (only one required as they are geared together)

If the latches will move (release) and nothing happens then there is most likely a return spring/plunger problem as that is what pushes the pinion back to the released position or the sleeve is stuck on it's splines.