Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
See the parts link above. This is a two belt system with a variable pulley between them for speed. Are the belts tight? No damage to the belts? Tension spring in place? Variable speed pulley rotating freely? Have belts ever been replaced?
See the parts list, and look at both belts and if they are tight.
Do you have owners manual?
Page from service manual, the first thing you need to do is remove the cutting deck!