Some models with K7M and F3R engines are equipped with a four-speed automatic transmission (refer to the accompanying illustration).
The transmission consists of a torque converter, an assembly of epicyclic gears, clutches, brakes and an electronic control unit.
The torque converter ensures the engagement of the drive disk with the transmission, as well as the change of gear ratios during acceleration.
Reverse gear or one of the four forward gears is engaged depending on which component of the epicyclic gear assembly is locked (using brakes and clutches) or rotates. The transmission pump provides the hydraulic pressure necessary for the operation of the brakes and clutches.
Pulses from switches and sensors associated with the transmission flap and gear selector rods are analyzed in an electronic device that determines the gear ratio and controls the transmission. The device activates electromagnetic valves that alternately open or close hydraulic channels, causing the clutches and brakes to engage or release the appropriate components of the gear assembly.
The transmission fluid is cooled by the coolant passing through a special radiator mounted on the transmission.
Due to the complexity of the automatic transmission, its repair and diagnostics should be entrusted to a Renault service station equipped with the necessary special equipment. The content of the following Sections is therefore limited to a general description and maintenance procedures for the unit.
Original article is on the portal: RenaultBook.ru