Repairs Freedom 42 deck, left blade not turning; pto belt getting chewed up

one issue? two?



Pretty much what the title says. It's an LT 166 bought used. Seems I replace the belts too often.



Let's guess: the timing chain? (Again)



I have been told DO NOT MESS WITH THE TIMING CHAIN, TAKE IT TO A PROFESSIONAL.



Should I simply do that? Can someone diagnose, or tell me how to diagnose? Can I mess with the timing chain?



Thanks

denno