Automatic gearbox (automatic transmission) - variation of the transmission of the automobile transmission, which provides automatic selection of the gear ratio corresponding to the current conditions of movement. If the automatic transmission does not switch speed, then my article will be just by the way. Here I will talk about the reasons for the emergence of such situations and explain how to eliminate this problem.

The automatic transmission is popular today both in the domestic car market and in foreign. Her advantages are more than enough, so it does not surprise such in demand. However, as well as a mechanism, it automatically has properties to break. Most often among car owners you can hear: the box cannot switch the transfer, you have to do this manually. We will talk about the possible causes of breakage and their diagnosis.

First of all, before starting work, you should make sure that the problem is precisely in the automatic transmission. That is, whether all other systems of the car are working, if the engine cannot switch speeds. There are many problems resulting in the drop in the oil level in the gearbox. The main problem here is a violation of the tightness of the front axle automatic transmission.

Causes of oil level drop in the automatic box:

1. Leather oils: through the seals of the crankshaft, through the laying of the cylinder block, through the oil filter laying, through the oil caps. The root of the first problem lies in the wear of the sealing edges of the crankshaft seals. This happens or due to the addition of poor-quality auto chemicals or poor-quality oil. The wines of the second problem may be due to engine overheating or due to improper tightening of power bolts when assembling the engine. The most characteristic basis of the third problem in not retaining the rubber sealing ring in its foundation. Chatting problem arises due to overheating of rubber caps.
2. Piston rings: wear, overheating, coking. Wear piston rings - the problem is common, because it always occurs. And, as a rule, this wear begins with the sections most exposed to pressure.
3. Overheating of the oilseed rings occurs at a temperature of more than 200 0. Any increase in temperature threatens the failure of the piston rings. This, in turn, affects the absorption level of the oil volume.
4. Cokalization of piston rings is due to the use of low-quality oil. After all, you agree, the rings are good only when they are moving. Their stagnation has a negative impact on the operation of the engine.

In addition to these reasons, there are many other causes of faults of 4x and 5 step gearboxes.

Fault automatic gearbox	Cause
After overcoming the lifting the car ahead of time can switch to reduced transmission.	Low oil level in gearbox, disk wear or sealing rings
The rear rate is in order, but the car does not move forward, but raging in place.	Wearing Disc Coupling Direct Structure Clogging Transmission Valve, Oil Rings Damage
Switching forward is normal, the movement back does not occur.	Problems in the operation of the brake tape (it is either worn, either truncated, or a rod of its piston), braking package malfunctions
When the car lever installed on the neutral position is moving forward or backward.	The cable or lever of the drive is incorrectly adjusted by touching discs or clutch plates.
The machine is moving when the gear shift lever is set to the "N" position.	Damage to the adjustment of the cable or lever drive control automatic transmission, interruptions in the work of the coupling piston, the welding of friction discs to the steel
Cruppers aluminum at the bottom of the pallet	Wearing either working layer of the sliding bearing, or aluminum washer, housing, etc.

Of course, this is not all the causes of the breakdown of the automatic transmission itself, but the most common. In addition to these, there are still faults of the electronic gearbox system. The diagnosis of such problems does not require mechanical intervention in the car, they are detected using the scanner.

The main feature of the electoral automatic transmission: The gearbox is in a deaf emergency mode, the automatic transmission does not switch.

This indicator refers to the problems of disruption of the engine control unit, disruption of air flow sensors, disruption of the transmission switching sensor, etc.

Eliminate the problem

If you doubt your abilities and skills, and not switch to automatic transmission, then, of course, it is better to contact the service. However, if you firmly decided to fix some problems yourself, here are some tips:

• establish the optimal oil level or to replace it at all;
• spend full computer diagnostics;
• check the scene, wiring, speed sensor and brake tape.

So, with my help, you got acquainted with what is an automatic transmission, the causes of its problems and their elimination. I hope my recommendations will help you!

Video "Repair of an automatic transmission"

The record shows how the automatic transmission is repaired.