we are talking a mower deck, deck is supposed to be designed to have a weakest link. I cant believe AGCO would design a deck like that where if the blade hits something it falls on the transmission to take all the force. Something doesn't add up...its why I prefer belt driven decks over gear any day.....well until today that is. At least the gear driven decks use shearpins.
My Husvarna hit several rocks, stumps until I finally got it all cleared with my GC2410...belt always gave way first...its not the strength of the belt but the pulley system it rides should allow slippage at certain Gs.