Opel Astra, Zafira

since 1998 of release

Repair and car operation

Opel Astra
+ Opel Astra and Zafira Cars
+ Operation manual
+ Routine maintenance
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
- Automatic transmission
   Adjustment of the mechanism of a choice of transfers
   Removal and installation of a cable of a choice of transfers
   Removal and installation of assembly of the lever of the AT selector
   Replacement of epiploons
   ATF cooler - the general information
   Removal and installation of electric components of a control system of AT
   Removal and AT installation
   Major maintenance of AT - the general information
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Automatic transmission

General information

The ARUS publishing house Management No. 179 is devoted to the detailed description of principles of functioning and designs of modern cars of automatic transmissions used on the majority.

Arrangement of AT and components accompanying it in an impellent compartment of the car (bottom view)

1 — the Amplifier of the power unit
2 — the Stretcher
3 — the Cable of a drive of gear shifting

4 — the Holder of a cable of switching
5 — the Cover of a cable of a drive of switching

4-step automatic transmissions (AT) consists of the hydrotransformer (the rotation converter), planetary assemblies and hydraulically operated couplings of coupling and brake tapes. Management of functioning of transmission carries out ECM by means of electrooperated valves. AT has three modes of movement: normal (economic), sports and winter.

The normal (economic) mode is intended for usual style of driving when gear shifting up occurs at rather low turns of the engine corresponding to a mode of the minimum fuel consumption. Switching in a sports mode is carried out by means of located on the lever of the selector of the button and leads to a delay of raising switchings of transmission that leads to increase of dynamic characteristics of the car, however is accompanied by some increase in fuel consumption. About inclusion of a sports mode the control lamp of "SPORT" (warns see. Head Operation manual). For inclusion of a winter mode of functioning it is intended located on the central console to switch, - the car troganiye from a place at activation of this mode occurs from the third transfer that essentially increases quality of coupling of protectors with a slippery paving.

The hydrotransformer (the rotation converter) provides torque transfer from the engine to a transmission. Thanks to that transfer of rotation is carried out in the hydraulic way (through transmission liquid - ATF), the troganiye of the car and gear shifting occur very smoothly. Besides, the hydrotransformer provides dynamic adjustments of size of a torque at dispersal.

The AT planetary mechanism provides possibility of a choice of four lobbies and one back transfers. The transfer relation of a planetary reducer is defined by what of its elements are blocked and what rotate freely. Blocking and an otpuskaniye of elements of planetary assemblies in AT is made by means of couplings of coupling and the brake tapes activated on teams, arriving from the management module. Placed in a transmission case the hydropump a pressure of the working liquid necessary for activation of couplings and brake tapes.

The driver operates AT means of the car established on a floor and the lever of the selector having seven positions. Situation "D" (Drive) provides possibility of switching of transmission on any of four forward transfers, thus the kickdown function provides automatic transition to a low gear when squeezing against the stop gas pedals (for the purpose of increase of the transfer relation, providing to the car the raised dynamic characteristics necessary, for example, at commission of overtaking). In the situation "1" forward switchings of transmission are completely blocked and the car can move only on the first transfer. The choice of provisions "2" and "3" provides transmission switchings between the first two / three transfers, providing possibility to make braking by the engine in difficult road conditions (for example, at movement in the mountain district). It is necessary to remember that AT switching on a low gear can occur only after adequate decrease in turns of the engine. The situation "R" (Reverse) corresponds to a choice of a reverse gear, the provision of "N" (Neutral) - neutral and the situation "R" - a parking.

Thanks to inclusion in a chain of start of the special sensor switch (the sensor switch of permission of start) start of the engine becomes possible only in the positions "R" and "N" of the lever of the selector, the same sensor switch provides operation of fires of a backing at transfer of the lever to the situation "R".

In view of complexity of a design of AT, absence on free sale of replaceable internal components, and need of use of the special equipment, originators of the real Management do not recommend to owners of cars to carry out major maintenance of transmission by own forces. In the present Chapter procedures of diagnostics of the general refusals of transmission, its routine maintenance, adjustments, removals and installations are considered only.

Sometimes, in case of serious breakage, it is more reasonable and simpler to replace transmission, than to waste time and funds for restoration of the failed assembly. Regardless of the chosen way of introduction of refused AT in action, independent performance of its removal and installation will help to cut down substantially expenses (before make sure that transmission really needs regenerative repair).