Reduce Branch Quantity - Machine Build (fail?)

You know that we really like machines for wood, branches, etc. That's why we decided to make another such machine.
This time we used a combustion engine with a power of 7 HP (actually it is probably 4 HP), a 1:100 planetary gear and a cutting mechanism of our own making.

Unfortunately, as you saw, the gear seized up and stopped. I'm not sure what the reason was, but I suspect two possibilities.
The gears were already a bit worn and I didn't know about it because I didn't look inside before starting the project or 3600 engine rpm was too much for this gear. From what I remember, it worked with a 1400 rpm engine and maybe that's the problem.

Life goes on and you have to move on to another project. Maybe we'll come back to this ;)
https://youtu.be/hBzQ_yfNPnA