Cummins 3804703 4089902 Crankshaft Oil Seal Kit

This crankshaft seal kit package includes the front crankshaft oil seal (part number 3804703) and the rear crankshaft seal kit (part number 4089902). Both components are engineered to meet original equipment specifications for Cummins KTA19, QSK19, KT19, and KT1150 series diesel engines. The rear seal kit 4089902 is a unitized assembly designed for reliable sealing under high crankcase pressure and thermal cycling conditions typical of heavy-duty mining applications. The front seal 3804703 interfaces with the gear cover and vibration damper hub. The rear kit 4089902 includes the main rear seal, wear sleeve, and installation tooling where applicable. These seals utilize high-temperature fluorocarbon (Viton) or PTFE lip materials bonded to a steel case for resistance to engine oil, coolant, and fuel dilution. Direct OEM cross-references include 3090297, 3090393, 3804704, and 4922217. Application verified for Hitachi EX1800-3 excavators equipped with Cummins KTA19 or QSK19 power units.