BARRING & MOUNTING GP 2793473 - Caterpillar

3406C (4TB) Engines Equipped With Twin Disc MG 514C Marine TransmissionsDescription of Change: A new dual stage coupling is available for use with the Twin Disc MG 514C Marine Transmissions. The new coupling replaces the former drive ring, 26 rubber blocks and drive spider assembly. The new coupling assembly is a dual stiffness flexible coupling. This coupling is very soft torsionally at low loads and stiffer at higher loads. This dual stage coupling feature will help prevent gear chatter that can sometimes occur when running the engine at very low speeds.Adaptable To: The new 134-5535 Coupling Assembly is available for use on 3406C (4TB) Engines equipped with Twin Disc MG 514C Marine Transmissions.