7 0 Cummins 6.7 Belt Tensioner $35 USD Quality used Dayco/KMP brand belt tensioner for cummins. Will work with 4BT3.9, 6BT5.9, 6CT8.3, 6ISBE, QSB 6.7 engines, backed by our standard warranty. COUNTER CLOCKWISE ROTATION OEM #... ConditionUsedStock Number30AT-3937556-STK MLS Number12794059CategoryBelt Tensioners Last Updated11/18/2025 LocationBig Lake, MN, US Sold ByQuality Bus and Truck Parts (844) 580-___ SHOWNUMBERCall Seller Email Seller Save More Info