Cummins 4982999 Fan Belt Assembly

The Cummins 4982999 is a serpentine V-ribbed belt designed to drive the fan, water pump, and alternator on B3.3 and QSB3.3 series diesel engines. Constructed from high-modulus EPDM rubber compound with polyester tensile cords, it provides resistance to heat, ozone, and abrasion in heavy-duty cycles. This part supersedes legacy reference C0412021748 and C04122021748. It is a direct fit for 4BT and 6BT industrial applications where the B3.3 platform is deployed. The belt profile features 6 ribs (6PK) with an effective length of approximately 2120 mm. Installation requires verification of tensioner travel and pulley alignment per Cummins service manual specifications.