Hitachi S114-257 Starter Motor Assembly

The Hitachi S114-257 is a 12-volt 1.4-kilowatt offset gear reduction (OSGR) starter motor designed for Yanmar industrial and marine diesel engines. It features a 15-tooth pinion with clockwise rotation and a two-ear mounting configuration with 13.5-millimeter mounting holes at 120-millimeter center distance. The pinion outer diameter measures 44.1 millimeters. This unit serves as a direct replacement for Yanmar engine models 3TNE84, 3JH2E, 3T84C, 4JH2, 3TNE88, and 4JH3 series. Cross-reference interchange includes Yanmar OEM numbers 129573-77010, 171008-77010, 121256-77011, 124250-77012, 124450-77010, 124772-77010, and 124772-77020. Komatsu reference YM171008-77010, Takeuchi reference T17100877010, John Deere references 18205 and 104-265, and Lucas Electric reference LRS01162. Compatible equipment includes Komatsu PC30-7, PC20-7, and PC30mr mini excavators, John Deere 30, 7200, 7400 tractors and EX2900, SX3100 loaders, Hitachi excavators, and Yanmar marine propulsion units.