JD 4300 PTO Problem

[StarrTractor]

As the title says guys I am working on a JD 4300 tractor. The problem I have is that it engages fine but disengaged really hard, and I mean really hard. It keeps breaking the roll pins. I changed the springs inside the pto brake and clutch, shift collar and spring, and a cracked hub on the brake end. I cant seem to figure this little thing out. I usually figure these things out but this has already taken to much of my shops time. I need to get it fixed. Any and every bit of information or experiences you can offer is greatly appreciated. Thanks

 

[RoyJackson]

When you disengage, are you at low RPM (1200 or thereabouts)?
PTOs should never be engaged or disengaged at high RPM (to me, that's anything above 1500 RPM).

 

[StarrTractor]

At low rpms and right now I have it taken apart and it still is hard to shift it.