Cummins 3954949 Crankshaft Pulley Assembly

The Cummins 3954949 crankshaft pulley serves as the primary drive interface for the engine accessory belt system, integrating the crankshaft position signal gear for electronic engine management. Manufactured from aluminum alloy, this component balances rotational mass reduction with structural rigidity required for heavy-duty diesel applications. This pulley supersedes part numbers 5255204 and 5365943 and fits a range of Cummins B-series and L-series derived engines including the ISDE, ISBe, QSB6.7, 6B5.9, 6CT, ISCe, QSC8.3, ISLe, and QSL8.9 platforms. It is widely applied in construction machinery such as the Komatsu PC200-8 excavator utilizing the 6D107 (SAA6D107E) engine configuration, as well as Dongfeng Cummins on-highway truck applications.