Buy Caterpillar 7W1661 - PULLEY-CRANKSHAFT (NOTE B) at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:- ENGINE - MACHINE- TRACK-TYPE TRACTOR Compatible Models:- 3412- 9C- 9S- 9U- 9- D9L- 59 Units Containing The Spare Part :- 7C1780 CONVERSION GP-CRANKSHAFT DRIVE-PART 1 OF 2 (3412)- 7W4150 CONVERSION GP-CRANKSHAFT DRIVEN-PART 1 OF 2-FIELD INSTALLATION (3412)- 7W1662 PULLEY GROUP (3412)