printable version

"Machine"

All you need - is to study the position of the lever-selector transmission control and its basic position:

P - parking (parking brake);
R - Reverse (reverse);
N - Neutral;
D - move forward.

So, start the engine, put the lever in position D - and go ... As long as you do not arrive at the place and turn off the engine. The car as you press the pedal "gas" will be very touched, change gear, accelerate, stop.

Of course, even the most intelligent "machine" can not "guess" what comes to your mind in a second or two. It works as if late: in the mechanical box you would have to shift gears, prepared, such as overtaking, and "automatic" transfer switch only at the moment when you click on the "gas" and begin to overtake. Therefore, at all, "machines" are additional functions: selector lever position, and (if the transmission is electronically controlled) switch programs.

Consider the purpose and function of these options on the example of BMW 750.

P-R-N - is clear. Next item - D. In this position, the selector lever-board computer, receiving a signal from the pedal position sensor and the fuel supply from the vehicle speed sensor, shifts gears - from the first (lowest) to four (accelerating). Engine braking when you reset the "gas" does not take place. But what if it is necessary, for example, on slippery roads or downhill?

Actions simple - compulsorily include the dates of your transmission, consistent with the provisions of the lever selector 3-2-1: dropping the "gas" and switch the lever on the 3, you will feel a noticeable engine braking in the range from 100 (at the higher rate should not be used) to 40 km / h. Further, switching to 2, it is possible to slow down to 15-20 km / h, including 1, will move to a full stop. It is recommended that the road on the right of free pre-workout and learn to slow down the engine, in order to experience the effectiveness of such action, since they differ markedly from the familiar to us the "mechanics".

Program switch has three positions: S - Sport mode, E - economic, M - manual. In manual mode selector lever position corresponds to a gear. Thus, you can manage as a semi-automatic transmission. This is useful when driving on a slippery road, sand, mud, etc. t. E., Where drastic changes are unacceptable forces on the wheel.

Sport mode of economic differs only in that the shift taking place at high engine speeds.

At cars of other firms lever selector can be decorated differently, but functions and ways to control the same. Thus, in modern American and Japanese cars after a neutral mode is D, which means the overdrive (OD), and corresponds to the fourth, overdrive. Sometimes, lever-selector there are only positions forward (D, 2 and 1) and there is a button on-off overdrive (JEEP Grand Cherokee, LINCOLN Mark VIII, etc.). In this case, to turn off the fourth transmission should include the button to "ODoff".

It should be noted that on many American cars FORD (Taurus, Escort, Town Car) lever selector has positions OD, D + 1, t. E. It is impossible to force the second gear, which limits engine braking and movement on the rise.

For vehicles with automatic transmission is necessary to observe a few rules:

1. Check the oil level in a box at least twice a month.

It should be remembered that:

- Check the oil level only when the engine is running;
- On the dipstick usually has labels for cold oil and hot. If the tag is not defined temperature at which the oil level should be checked, do so only on the heated box - after 10-15 kilometers;
- The oil level is usually tested for parking (P). On the dipstick sure there is an inscription to clarify the method of verification. So, on JEEP Grand Cherokee oil level check only neutral.

2. Replace the transmission oil after 30 000 km.

It should take into account that universal oil for automatic transmissions - Dextron. Modern oil designated Dextron III. It can be mixed with oils of the previous marks (Dextron II, IID and IIE). It is more stable and more powerful vyaznost improvers work box. The production of gearboxes used CHRYSLER oil MOPAR ATF Plus, which can be successfully replaced by Dextron III. For transmissions manufactured by ZF also use oil type Dextron, however, the BMW 540 and 740 is used only synthetic oil ESSO ATF LT 71141. It is used in all transmissions of this firm with the green label brand. Mix oil if necessary, but undesirable.

3. towing vehicle with automatic transmission not further 30 km and a maximum speed of 50 km / h, if the engine is faulty or there is no oil in the box.

Remember that if you need to tow the car at a long distance, you can, but you should fill the gearbox further 2-3 liters of oil to all the parts are literally bathed in it.

4. Avoid overheating of the engine, since this could lead to a drastic overheating gearbox oil and, consequently, to failure of the carton.

Finally, with the appearance of noise, vibration, hard shocks when shifting gears, switches and so tightened. E., Immediately consult in specialized centers on repair of automatic transmissions, especially if in your car electronically controlled transmission. Timely diagnosis will prevent significant repair costs.

Do not attempt to fix the problem - your curiosity, self-confidence and savings "kulibinyh" cost dearly.