Tboss 410 Problem with gears grinding when trying to put in forward or reverse.

[Dreaded]

This tboss 410 started having a problem with I think clutch not releasing. If you have it in forward with neutral safety disabled and try to turn it over, it will try to move forward. Neutral does work correctly.
What I was told occurred was he was trying to back up a hill and was trying to pull a load. He said that it all of sudden died and would not go into gear. To get it back he disabled the neutral safety and started engine and drove back but had to switch to neutral to stop.
Is this going to be the centrifugal clutch on the drive belt or could it be something else?

[Dreaded]

 I decided to tear it down since it took a couple days to get site approved. What I found is the clutch melted and froze.
Pics show it all. I took the clutch apart and found clutches jammed up and not movable.
I ordered a new secondary clutch to replace it, the primary drive seems ok so I will reused it.
 

[papalarmon]

Is it idling to high ?