I have a Toro 622 Power Throw Model No. 38062 which is approx 16 years old. One of the augers stopped engaging and spins loose on the shaft. I am uncertain whether or not I have broken a shear pin or I have auger drive belt problems (the belts look O.K. to the naked eye). I know this machine is a relic but it has served me faithfully for the past 16 seasons. Suggestions on how to repair and get a few more seasons out of "the old girl"?? Thanx. Rodger