if it's slipping put a new belt....if the new one is slipping too then u have a problem with the tensioner(unlikely)
 
The pulleys look shiny so when I change the belt I'm goin to roughen the pulleys a but with sand paperi think.
 
+1 if u want to be sure there is good adherence "rub" the pulleys with violin rosin... dont laugh, it's tested
 

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