Common errors in car gearboxes

(Baonghean.vn) - After a period of use, the car's gearbox also breaks down like other parts. Drivers should know the most common errors to fix them quickly and effectively.

Driver's gearbox failures can be easily detected when the vehicle is operating with the following signs.

Gearbox oil leak

Transmission fluid leaks are one of the easiest ways to detect a problem with your transmission. In automatic transmission vehicles, transmission fluid is vital to the vehicle's performance.

The cause of oil leakage in the gearbox is due to the aging of the gasket, the seal is warped due to strong impact contact, the gasket is loose and causes oil leakage. The phenomenon of oil leakage in the differential seal is due to long-term use without maintenance or the differential seal is torn when disassembling and assembling.

Car is noisy when in "mode"

An unpleasant noise when idling can again indicate that the transmission fluid is due for a change, or it can be a sign of more serious mechanical damage. However, most often the noise is caused by worn bearings or gears in the transmission that need to be replaced.

Gearbox is noisy and vibrates

Manual transmissions often make a grating noise when shifting gears, even when the clutch is fully disengaged. This can happen when the clutch is worn out, or when the gears in the transmission are damaged.

On an automatic transmission vehicle, if the vehicle does not shift smoothly as usual but vibrates or shifts with difficulty, the vehicle should be checked immediately.

Slide number

If it’s working properly, the transmission will either continue to operate in the gear you want, or the computer will automatically shift gears when it reaches a certain rpm to save fuel. If the transmission is slipping, it can jump into different gears on its own, or put it into “neutral” with a manual transmission.

This is a dangerous symptom, you may lose control of the car when you need to get out of emergency situations. Therefore, you should immediately take the car to a repair shop to quickly fix the gearbox.

Inappropriate vehicle speed shift

When shifting gears and accelerating, the vehicle speed does not match the engine, the vehicle runs weakly, slowly, and cannot reach high speeds. The cause is due to worn or burned friction discs, and damaged solenoid valves at the gears in the gearbox.

The car cannot move.

The condition of the vehicle not being able to shift gears to move is due to a broken one-way clutch or a broken turbine blade inside the torque converter of the gearbox. In this case, the entire gearbox must be replaced for the vehicle to be usable.

In addition, some car models using limited-slip differentials may have defects during the manufacturing process, causing noise when steering, loss of control when cornering, etc.

Causes of gearbox failure

- Lack of oil:When the automatic transmission oil is below the “Min” level, the oil pressure to lubricate the moving parts in the gearbox will be reduced, and the oil valves will not operate properly.

- Dirty oil:When the gearbox is working, metal shavings are generated. If the oil is not changed periodically, these metal shavings will clog the solenoid valves and the oil line supplying the friction discs.

- Using the wrong type of oil:Each car manufacturer and model equipped with an automatic transmission may require different standards for lubricating oil for the transmission, and usually the newer the car model, the higher the standards. When using substandard oil, the parts will quickly wear out and be destroyed.

Notes during use

- Oil needs to be changed periodically according to each manufacturer's recommendations.

- Use the correct oil brand for each vehicle model.

- Check oil regularly and periodically.

- Must be in the correct gear (vehicle must stop completely before shifting from D to P or from D to R).

- When stopping for a long time, shift to N.

- When climbing steep slopes or going downhill, do not leave the gear in D, but switch to a lower gear to avoid overloading and boiling the oil in the gearbox.

- When the car is flooded for a long time, you should call a tow truck to take it to the garage for handling./.

Ngoc Anh

(Synthetic)