Hi, just joined, I searched the forum for my problem. I am working on my mother-in-law's Yard Machine by MTD, transmatic lawn tractor Model 688 with a 15.5 Hp. motor. I changed the transmission drive belt using the Operators Manual. Didn't have any problems until I went to test it out and it will only go in the two highest speeds. On the shift cover panel there is directions for the problem that says: With the engine off put transmission in neutral with shift lever in parking brake slot. Start the engine put the shift lever in highest setting ( I can hear the drive belt from the motor turning) return the shift lever to lowest setting, put transmission forward or reverse, but nothing happens. Move the shift lever up to next to highest setting and zoom, zoom. I checked the speed control rod and adjusted it to what the manual said. Anyone have any ideas? Bill
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