Fertilizer and high humidity are very tough on any parts not made from stainless steel (or plastic). Throttle cables, pump-on and off, electric components, too. Is this a corrosion situation? Did you clean it often and take good care of it? Change oil? Change air filter, change fuel filter? Did you make sure that all gas (and alcohol) was run out before winter storage? What kind of motor? Wait--I think I see a Honda motor on the website. http://www.turfexproducts.com/sprayers Was spread pattern good? Spray pattern good? Tank convenient? Any electric components? How is pump driven? How is the spinner driven?