How often should one replace belts? Also how does the weather affect expedting in the context of cold weather?[/QUOTE
My guess would be only a visual inspection would tell ya that,,cracks,,fraying,,,condition of your pulleys,,tension,etc etc.
In this line of work where ya are depending on your belts so much,,,Im going with by the end of 3 years service.which is appoaching fast and altho my belt looks real good right now,,,its coming off and going in the tool box for a back-up. I really dont know if there is a set milage or time periord for a belt????
As for the weather,,,,well it effects me because if its looking real bad,,,Im not acceppting the load offer untill it blows thru