Newbie help: CAT 2000 rear belt keeps snapping

[Nezbo]

Hi,

I have recently got/getting back in the rc 1/10 cars after a lot of years out, feeling nostalgic I wanted to get myself a Schumacher ProCat but couldn't get one, so I ended up getting a CAT 2000 and dug out some of my old kit and got the car working.

I noticed the rear diff pulley and lay shaft pulley was damaged and worn, I presumes that the worn pulleys was the cause of the first snapped belt. I replace all the pulleys and belt and I the second new rear belt snapped.

Is there something I am doing wrong with the setup or is there something else that course cause a snapped belt?