Yanmar KM4A2 Gear R 2.63 for JH4-TE / JH4-HTE – KM4A2G is a marine transmission component designed for integration with Yanmar diesel propulsion systems that require a compact reduction gearbox. It serves as the mechanical interface between the engine and the propeller shaft, transferring engine output in inboard marine installations used in sailboats and auxiliary powerboats. This unit forms part of an OEM Yanmar marine propulsion configuration and is intended for standard drivetrain layouts where accurate alignment is required.
This gearbox is configured with a 2.63 reduction ratio and is compatible with Yanmar JH4-TE and JH4-HTE diesel engines specified for KM4A-series transmissions. The reduction ratio supports appropriate propeller shaft speed and torque characteristics for typical marine operating conditions. When installed according to manufacturer specifications, it integrates with approved engine mounts, controls, and shafting systems without modification as an OEM Yanmar marine gearbox replacement.
This Yanmar marine gearbox is typically used for replacement of existing transmissions, repower projects involving compatible JH4 engines, or new marine installations requiring an OEM Yanmar marine propulsion transmission solution.
