Turbo retarder coupling Transmission Turbo retarder coupling (G3Y) The turbo retarder coupling (G3Y) is a system the main component of which is a fill-regulated, hydro- dynamic coupling (turbo coupling). The turbo retarder coupling will be available as of 11/2013 in combination with the engines OM 471 and OM 473 and the transmission G 280-16 for heavy-duty applications as special equipment for the Actros 6x4 and for the Arocs with the wheel configurations 6x4, 6x6, 8x4/4, 8x4 ENA, 8x6/4 and 8x8/4, with the exception of concrete mixer chassis. The turbo retarder coupling unites the "hydrody- namic start-up" and "hydrodynamic braking" func- tions into one system.
The characteristic of the unit can be varied by specific filling and emptying of the hydrodynamic circuit. Moving off: Braking: In normal driving the turbo retarder coupling is not filled with oil. When starting off, it is filled with the necessary quantity of oil according to the acceler- ator pedal position. The power is transmitted to the transmission input shaft via the hydrodynamic circuit and a downstream overrunning clutch. A conventional friction clutch is arranged in parallel with the circuit to act as a lockup clutch. When braking, the turbine wheel is locked with the turbine brake, turning the system into an effective engine retarder when the friction clutch is closed.
W25.40-1143-00 Turbo retarder coupling 28 i Introduction of the New Truck Generation - The New Arocs (Model 964) – This printout will not be recorded by the update service. Status: 01 / 2013 –