Idler Pulley Description
This Idler Pulley is indexed for Cummins Fit For Cummins Engine: ISL8.9, ISC8.9, ISB, ISL9 CM2150 SN, ISLE4 CM850. Compare reference number 3103904 against the label on your existing Cummins component before ordering.
Before checkout, compare OEM part number 3103904, connector layout, mounting position, and machine serial number. For high-value or fitment-sensitive parts, submit the fitment form below so support can verify the match.




