The Throw-Out Bearing, also known as the Clutch Release Bearing, is a key component in the automotive clutch system that is located between the clutch pressure plate and the clutch release fork. Its main function is to push the clutch pressure plate away from the flywheel when the clutch pedal is depressed, thus disconnecting the power connection between the engine and the transmission and making gear shifting possible.

Generally speaking, the causes of bearing failure can be summarised as follows:

1. Poor lubrication:

Insufficient lubricant.

Use of the wrong lubricant.

Lubricant contamination or deterioration.

2. Wear and tear:

Wear of rolling elements and rails due to prolonged use.

Frequent clutch operation increases bearing load.

3.Overload:

The bearing is subjected to a load that exceeds the designed load carrying capacity.

4. Improper installation:

Deviation, over tightening or over loosening during installation.

Pre-tensioning force is not set properly.

5. Pollution and impurities:

Dust, particles, moisture and other contaminants into the internal bearing.

6. Overheating:

The clutch is operated frequently or the vehicle is operated under high load.

Insufficient lubrication leads to overheating.

7.Mechanical damage:

External impact.

Damage caused by improper assembly.

8. Design or manufacturing defects:

Improper material selection.

Inadequate heat treatment.

Insufficient machining accuracy.

Unreasonable structure or design of the bearing itself.

9.Clutch system related problems:

Improper clutch adjustment, such as incorrect air gap setting.

Clutch pressure plate is uneven or deformed, causing extra pressure on the bearing.

Clutch disc wear increases bearing load.

10.Environmental factors:

High temperature, humidity and corrosive gases in the working environment adversely affect the bearing.

The above reasons cover many aspects of bearing failure, from lubrication, wear, overload to installation, pollution, design and other dimensions are analysed in detail. When preventing bearing failure, these factors should be considered comprehensively and corresponding measures should be taken to reduce the risk of failure.

When a throwout bearing begins to fail, drivers may notice the following symptoms:

- Abnormal noise when operating the clutch, such as squeaking or whistling.

- Abnormal clutch pedal feel, such as longer travel or extra resistance.

- Difficulty shifting gears because the clutch does not disengage completely.

- In extreme cases, the clutch may not disengage completely, making it impossible to shift gears.

To avoid failure of the hydraulic throwout bearing, it is important to regularly inspect and maintain the clutch system to ensure that it is well lubricated and in a proper operating environment. If any of these symptoms are noticed, the bearing should be inspected and replaced promptly to avoid more serious damage to the clutch system.