Crankshaft Dampener Pulley
CTPA-AR57241 Replacement Part to Fit:  John Deere "For Models: 4040, 4240, 4240S, 4350, 4430, 4440, 4455, 690B, 4230 DIESEL, 4320, 6600, 6602, 6620, 6622, 7700, 7720"  Price:  $159.61  Buyers Club Price:  $143.65