Buy Caterpillar 6N3844 - PULLEY-CRANKSHAFT at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:- ENGINE - MACHINE- WHEEL TRACTOR-SCRAPER Compatible Models:- 3408- 3408C- 3408E- 631E- 631G- 633E II- 637E- 637G Units Containing The Spare Part :- 6N3788 PULLEY AND DAMPER GROUP (3408)- 6N3788 PULLEY GROUP-AUXILIARY DRIVE (3408)- 319-7401 SEAL GP-CRANKSHAFT -FRONT (3408E)- 319-0785 SEAL GP-CRANKSHAFT (3408E)- 319-0785 SEAL GP-CRANKSHAFT -REAR (3408E)- 6N-3788 PULLEY GP-AUXILIARY DRIVE (3408E)