Cummins 3415378 Power Steering Pump Assembly

The Cummins 3415378 is a hydraulic vane-type power steering pump designed to provide consistent hydraulic flow for power-assisted steering systems. It is engineered for direct mounting on Cummins B and C series diesel engines, converting engine mechanical energy into hydraulic pressure to assist steering gear operation. This pump assembly features a cast iron housing with integrated reservoir mounting provisions and a splined drive shaft for gear-driven operation. It is calibrated for a nominal flow rate of 18.9 L/min at governed engine speed with a maximum operating pressure range of 140 to 185 bar depending on specific vehicle application requirements. The unit includes internal pressure relief and flow control valves to maintain stable steering effort across engine speed ranges. Cross-reference part numbers include Cummins OEM numbers 4930793, 3415402, 3967423, 3967429, 3967541, 3974510, 5268154, 4930900, and 3406RN3-001. Compatible with Cummins 6BT5.9, 6CT, 6C8.3, ISC, ISL, QSC, QSL, 4BT, 6BTA, and M11 engine series used in Freightliner trucks, Dongfeng commercial vehicles, Yutong buses, and various construction machinery including excavators, wheel loaders, and skid steer loaders.