Denso 1857104 Starter Motor Assembly

This 12V starter motor assembly is engineered for Kubota D1105 series diesel engines widely deployed in mini excavators, compact tractors, and Cummins Onan generator sets. The unit utilizes a Denso offset gear reduction (OSGR) design delivering 1.0 kW cranking power with a 9-tooth pinion (66 mm spigot) and clockwise rotation. It features a two-hole flange mounting pattern and M8 B+ terminal connection. The component serves as a direct replacement for Kubota OEM 16853-63014 and Cummins Onan 185-7104, ensuring reliable cold-start performance in industrial and construction equipment applications. Manufactured to OEM specifications by Denso, the starter incorporates a high-torque armature and durable solenoid assembly designed for repeated heavy-duty cycling. Cross-references include Denso part numbers 228000-7090, 228080-5401, and 228000-7480. Verified fitment extends to Kubota D1005-EFM, D1105-EFM, and V1305-FM engine variants.