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Yanmar Gearbox

KMH4A

Kanzaki-built 8-degree down-angle hydraulic marine gear with 2.04 or 2.45:1 ratios, Yanmar's option for the turbocharged 4JH engines including the 4JH3-DTE, 4JH4-TE/HTE and 4JH80/110.

The KMH4A is a hydraulically shifted marine gear with an 8-degree down-angle output, ratios of 2.04 and 2.45:1 identical ahead and astern, either propeller rotation, and a dry weight of 31 kg per Yanmar's 2020 gear table. It offers a trolling function and has its own seawater-cooled oil cooler on the current JH engines.

Yanmar lists it for the 4JH4-TE, 4JH4-HTE, 4JH3-DTE, 4JH80 and 4JH110; a KMH4A1 drawing exists for the 4JH3-T/4JH3-DTE. Kanzaki's 1998 service manual already covers the KMH4A. It is a current option.

Sources

  1. 1. Kanzaki Gears product page with gear/engine applicability table (2020 capture) — Yanmar Marine International
  2. 2. Kanzaki Gears product page (downloads and engine x gear drawings) — Yanmar Marine International
  3. 3. JH Series Operation Manual 4JH45, 4JH57, 4JH80, 4JH110 (0AJHC-M00011, 2014) — Yanmar
  4. 4. Kanzaki Marine Gear Manuals (manual index) — Marine Diesel Basics
  5. 5. Yanmar Marine parts catalogue: Clutch, KMH Series — Yanmar Shop (Yanmar parts data)

Specifications compiled from manufacturer sources.