Mower Deck

If	Check
Discharge Chute Plugged	Grass is wet - mow grass only when dry. Raise cutting height. Mow at full fast throttle. Ground speed too fast for conditions. Correct installation of deck drive belt.
Mower Deck Vibrates	Run engine at fast throttle. Loose hardware. Check/replace deck drive belt. Blade bolts are loose. Blades are bent or worn. Sharpen and balance blades. Remove belt shields and clean debris from sheaves. Check sheaves for proper alignment or damage. See a John Deere dealer.
Mower Blades Do Not Engage	Deck drive belt slipping or broken. Deck belt tension spring not installed or broken. PTO switch failure. Fuse is blown. Loose electrical connections.
Mower Mows Unevenly	Mower deck not properly leveled. Ground speed too fast for conditions. Run engine at fast throttle. Reduce ground speed when making turns. Sharpen or replace blades. Change mowing pattern. Check air pressure in all traction unit tires.