Hi Joe,
Here are the instructions.
This was another Cat design disaster and the reason so many of them are buggered up.
The belt for the starting mechanism is 6B5653 bt if you get it from Cat this number may be changed but they have the changeover number. Take the old belt with you as they can measure it with a special belt measure or it can be done by putting a mark on the belt & the floor or whatever & roll the belt around till the belt mark comes to the floor again & mark that spot & measure between the two marks for the belt length.Most if not all places has a chart or book with different lengths of belts so they just match your length & width with the book & give you one.At times at the Cat shop you didn,t have a number for a belt so thats how I arrived at a belt to fit & customers if they needed a belt for other than a Cat machine or whatever.