7 signs your car's gearbox needs maintenance

(Baonghean.vn) - Because it rarely breaks down, the gearbox is rarely noticed, but if there is a problem, it is often very serious, causing costly repairs and reducing the quality and value of the vehicle... Let's take a look at the signs that indicate the need for maintenance and oil change of the automatic transmission.

1. Difficult to shift gears

Suddenly one day the gear lever becomes "stubborn", the difficult to control situation occurs not only when shifting into 1st gear but at any up and down point. The common cause is low lubricating oil level due to leakage or poor viscosity due to expiration or dirt.

2. Oil smells burnt

The smell of burning oil is a sign that the transmission is overheating. Transmission oil not only lubricates moving parts but also dissipates heat, as some vehicles have an oil cooler. Overheating usually occurs when parts are misaligned or the oil has low viscosity.

3. Gearbox is too noisy

Listening for noise is a lot about intuition. Noises can be subtle and subtle, making it difficult to tell if they are coming from the transmission or somewhere else in the car. If you’re sure your transmission is louder than usual, it could be due to worn bearings, bushings, or gears.

4. Sticky clutch

Even with the clutch pedal pressed to the floor, shifting gears is still difficult, accompanied by a screeching sound. The clutch has not been released, making it difficult for the gear pairs to engage because they are not synchronized, the friction discs slide on the flywheel and the pressure plate, creating a shrill sound. The cause often comes from the clutch transmission system not creating enough separation force because the cable is loose, the free travel is too large...

5. The cone does not cut.

This is another symptom that often “haunts” manual transmission drivers. Even though they fully depress the clutch pedal, the clutch still does not disengage completely, and the clutch plates continue to press against the flywheel, causing unpleasant noises when shifting gears.

6. Car speed does not match engine speed

When the driver accelerates but the vehicle still moves slowly, the cause may be a worn or burned friction disc, or a damaged solenoid valve in one or more gears.

7. Check Engine Light is on

The "Check Engine" light is on to warn of engine-related problems, sometimes caused by transmission vibration, or the ECU predicting transmission problems that you have not yet felt or seen. The error is encoded by the computer as a string of characters (error code) and stored in the memory of the central computer. Diagnostic devices or scanners can read and report the details of the damage.

Ngoc Anh

(Synthetic)