JD2320 PTO lever pops out of gear

[Hopster]

I don't have a service manual and local JD dealer has no idea when they can fit tractor in shop for repairs. When cutting grass with belly mower , the PTO select lever pops out of detent whenever thick grass encountered. Regardless of rpm, speed. Must turn PTO yellow switch off , engage PTO again, and turn yellow switch back on to re engage. Any ideas on where to look?

 

[bradrich18]

I just started having the same issue with my 1026R. Mine doesn't have to be in thick grass though. Have you figured anything out yet?