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Automatic transmission fluid (ATF) is a hydraulic fluid that is essential for the proper functioning of vehicles equipped with automatic transmissions. Usually, it is coloured red or green to differentiate it from motor oil and other fluids in the vehicle.
As a fluid coupling operates kinetically, low-viscosity fluids are preferred. [7] Generally speaking, multi-grade motor oils or automatic transmission fluids are used. Increasing density of the fluid increases the amount of torque that can be transmitted at a given input speed. [8]
Automatic transmissions on automobiles, such as cars, buses, and on/off highway trucks.; Forwarders and other heavy duty vehicles.; Marine propulsion systems.; Industrial power transmission such as conveyor drives, almost all modern forklifts, winches, drilling rigs, construction equipment, and diesel-hydraulic railway locomotives.
A disadvantage of this arrangement is that there is no oil pressure to operate the transmission when the engine is not running, therefore it is not possible to push start a vehicle equipped with an automatic transmission with no rear pump (aside from several automatics built prior to 1970, which also included a rear pump for towing and push ...
The 6R 80 features "Filled for Life" low viscosity synthetic transmission fluid (MERCON LV), though a fluid flush is recommended at 150,000 mi (241,000 km) if your truck falls under the classification of "Severe Duty" operation. The transmission, as used in the Ford F-150, has a fluid capacity of 13.1 US qt (12.4 L) and weighs 215 lb (98 kg).
The rear pump was an unregulated gear pump driven from the transmission output shaft, which meant it was capable of pressurizing the transmission if the vehicle was in motion. This feature made it possible to push-start a vehicle with a dead battery if the vehicle could be accelerated to at least 15–20 mph (24–32 km/h).