Troy-Bilt Horse Tiller Technical Manual - Page 7

SECTION 2: Transmission Troubleshooting PTO HORSE MODEL TECHNICAL MANUAL Page 2-3 4/90 Wheels and/or Tines Do Not Turn Symptom Wheels and tines won't turn even though Wheels/Tines/PTO Lever seems to work properly. Tines turn but the wheels do not turn or turn only in one speed. The Wheel Speed Lever moves the clutch into either gear. Remedy • Inspect the drive belt for wear or mis-adjustment. See the Owner/Operator Manual for instructions. • Check condition and adjustment of reverse disc. See the Owner/Operator Manual for instructions. • Inspect the mounting bolt on the transmission drive pulley. It may be loose or missing, which would allow the key in the pulley to fall out. If so, the drive belt or reverse disc will turn the pulley but the pulley will not turn the power unit drive shaft. Tighten the bolt (with the concave washer in place) securely. • Check for play in the power unit drive shaft. If there is play in the drive shaft, find out why. It could be a loose bearing cap, improper shimming, damaged bearings or worn worms. • If the transmission is new or rebuilt, the key on the transmission engine pulley may not have been installed. If so, the pulley cannot transfer power to the drive shaft. • If the transmission is new or rebuilt, the internal keys in the pinion assembly may not have been installed. If so, the pinion gears will not drive the wheel speed gears. • Inspect the hi-pro key that lets the clutch turn the wheel shaft. It may be missing or broken. • Inspect the lugs on each side of the clutch; they may be worn. • Inspect the fast and slow speed wheel gears. One or both may be worn. • Inspect the fast and slow speed pinion gears. One or both may be worn. • Inspect the power unit drive shaft worm. It may be worn and not meshing with the bronze worm gear on the pinion shaft assembly. • Inspect the bronze worm gear on the pinion shaft assembly. It may be worn and not meshing with the power unit drive shaft worm. • If the transmission is new or rebuilt, the key that holds the bronze worm gear to the fast speed pinion gear may not have been installed. This means the bronze worm gear will turn but it will not turn the pinion gear. • If the wheels only turn in the fast wheel speed and if the transmission is new or rebuilt, the key may be missing from the stem pinion gear, preventing the transmission from operating in slow gear. The key locks the stem pinion to the fast speed pinion gear.