Apparatus and improved method for changing automatic transmission fluid in motor vehicles

摘要

An apparatus for replacing transmission fluid in an automatic transmission. The apparatus comprises a tank separated into a pair of compartments by a bladder or diaphragm. At least one pressure regulator communicates with the tank. A vent valve assembly also communicates with the tank. A process for cleaning an automatic transmission and for replacing after cleaning used automatic transmission fluid in the automatic transmission with fresh automatic transmission fluid. The process includes flowing fresh ATF into a first compartment of a tank and into a pliable tub or bladder member in communication with the first compartment until the pliable tub or bladder member and the first compartment are filled with a volume of fresh ATF. A chemical cleaning compound is disposed in the used ATF of the automatic transmission and is circulated through the automatic transmission and its associated components to clean the same and produce contaminated used ATF. The process additionally includes flowing the contaminated used ATF from the automatic transmission into a second compartment in communication with the pliable tub or bladder member, causing the fresh ATF to flow from the first compartment and from the pliable tub member into the automatic transmission. The pressure of the flowing contaminated used ATF is regulated.