Wheels And/Or Tines Do Not Turn - Troy-Bilt 7 HP Technical Manual

SECTION 2: Transmission Troubleshooting
Wheels and/or Tines
Do Not Turn
PTO HORSE MODEL
TECHNICAL MANUAL
Page 2·3 4/90
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 fallout. 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 trans-
mission from operating in slow gear. The key locks the stem pinion to the fast
speed pinion gear.