Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Model number of mower? Rider mower I assume. Are all the belt guides in place and close enough to the pulleys to keep belt from coming off?
See link above. Two belt system, with variable pulley between. Long belt coming off?
?? Yes, No? Long belt or short belt, is the variable pulley free to spin? Bearing not bad in variable pulley?
Idler pulleys ok? Turn freely? No excessive vibration when belt is turning?
I s the tension spring keeping the belt tight? # 27 in the parts diagram??
Belt has to be tight , pulleys have to have good bearings, guides have to be in place, and Belt has to be right length.???
This is the same setup that has been around fr years, The deck belts are the problem areas. Can you determine which pulley belt is coming off of first?