GF27.10-P-0001G Automatic Transmission (AT), Function
GF27.10-P-0001G Automatic transmission (AT), function
- TRANSMISSION 722.6 in MODELS 163, 170, 202, 208, 210
- without touch shift
- TRANSMISSION 722.6 in MODELS 129, 140
Automatic transmission 722.6 is an electronically controlled 5-speed transmission with a lockup clutch in the torque converter. The ratios for the gear stages are achieved by three planetary gear sets. The 5th gear is designed with a step-up ratio as an overdrive. Shifting is initiated electronically. The gears are shifted by the corresponding combination of three hydraulically actuated multi-plate brakes, three hydraulically actuated multi-disc clutches and two mechanical freewheels.
Basically automatic transmission 722.6 with electronic control offers the following advantages:
^ Reduced fuel consumption
^ Improved shift comfort
^ More favorable gear steps as a result of 5 gears
^ Enhanced life and reliability
^ Reduced servicing costs
The electrohydraulic control unit is bolted onto the bottom of the transmission housing. The end of the transmission is formed by an oil pan made of sheet steel.
The oil pressure for the converter lockup clutch and center multiple-disc clutch is supplied via holes in the input shaft. The oil pressure to the rear multiple-disc clutch is routed through the output shaft. The lubricating oil is supplied and distributed by additional bore holes in both shafts. All bearing points of the gear sets as well as freewheels and shift elements are supplied with lubricating oil.
The parking lock gear and drive flange are connected to the output shaft by gearing.
Freewheels F1 and F2 optimize shifting. The front freewheel (F1) rests against the stator shaft extension on the transmission side and connects the sun gear of the front planetary gear set to the transmission housing in the locking direction.
The torque converter housing and transmission housing are made of a metal alloy. They are bolted together and centered via the outer multiple-disc carrier of the multiple-disc brake B1. A coated intermediate panel seals the two components.
The oil pump and outer multiple-disc carrier of the front multiple-disc brake are bolted to the converter housing. The mechanical part consists of the propeller shaft, output shaft, a sun gear shaft and three planetary gearsets which are coupled together.
In transmissions for powerful engines, the planetary gearsets have 4 planetary gears, while for less powerful engines the front and rear planetary gear system has three planetary gear wheels. The stator shaft is pressed into this and is secured against turning by a spline.
The rear freewheel (F2) connects the sun gear of the center planetary gear set to the sun gear of the rear planetary gearset in the locking direction.
The electrohydraulic control unit consists of the shift plate made of light alloy for hydraulic control and an electronic control unit.
The electrical control unit consists of a supporting body made of plastic in which the electrical components are combined. The shell is screwed to the shift plate. Conductor tracks which are integrated into the shell, connect the electric components to a plug connector. This 13-pin plug connector forms the connection with the vehicle-side wiring harness and with the ETC 5 (electronic transmission control) control module (N15/5) via a bayonet lock.
Component Identification:
