Hydraulic Throwout Bearing

 Hydraulic Throwout Bearing Working Principle

Hydraulic throwout bearings, also known as hydraulic clutch release bearings, are an important part of the clutch system in manual transmission vehicles. Its main function is to interrupt the power connection between the engine and the gearbox when the clutch pedal is depressed. The specific workflow is as follows:

- Start-up process: when the driver depresses the clutch pedal, the fluid in the hydraulic system is pressed into the hydraulic cylinder.

- Pressure transfer: The hydraulic pressure drives the hydraulic throw-out bearing outwards.

- Separation action: The bearing pushes the release lever on the clutch pressure plate, which separates the pressure plate from the clutch disc (clutch plate), thus cutting off power transmission.

 Features of hydraulic throw-out bearings

Hydraulic throwout bearings have the following significant features over traditional mechanical throwout bearings:

- Adjustment-free: Hydraulic throw-out bearings utilise a hydraulic system to automatically adjust the appropriate clearance, thus eliminating the need for regular manual adjustment.

- Reduced burden: The hydraulic system reduces the force required by the driver to press the clutch pedal and improves driving comfort.

- Smooth operation: The hydraulic system provides a smoother and more linear clutch engagement feel, enhancing the driving experience.

- Enhanced Durability: Reduced direct contact and wear between mechanical components helps to increase the life of the throwout bearing.

 Hydraulic throwout bearing maintenance requirements

Despite their more advanced design, hydraulic throwout bearings require regular inspection and maintenance of the hydraulic system, which includes:

- Checking the hydraulic oil level: Ensure that the hydraulic oil is adequate and has not deteriorated.

- Replacing seals: Periodically replace worn seals to prevent hydraulic fluid leakage.

- Checking for leaks: Regularly checking the hydraulic system for leaks and repairing them in time to ensure that the system is functioning properly.

 Signs of Hydraulic Throw Bearing Failure

Hydraulic throwout bearing problems usually exhibit the following sounds or symptoms:

- Whining or squealing noise: When the clutch pedal is released, a sharp whining or squealing noise may be heard, which is usually the result of inadequate lubrication or bearing wear.

- Strange noise or squeak: a noise that occurs when the clutch pedal is depressed and disappears upon release, which may be accompanied by a clicking or grinding sound, indicating a problem with the throwout bearing.

- Rattling Noise: May be only a slight rattling noise initially, but can get progressively worse and is sometimes mistaken for a problem within the drivetrain.

- Grinding noises during gear changes: grinding noises produced during gear changes are a clear sign of throwout bearing failure.

- High-pitched squeaking or low grinding noises: these can be very loud, especially when the engine is running, and usually manifest themselves as a constant squeaking or a low continuous grinding sound.

If any of these sounds are present, stop the car immediately for inspection or take it in for service to avoid further damage. For uncertain sources of noise, it is advisable to seek the help of a professional mechanic for an accurate diagnosis.

In conclusion, the hydraulic throwout bearing is an important part of the clutch system of a manual transmission vehicle, utilising the hydraulic system to achieve clutch disengagement. When it fails, it usually emits whining, squealing, strange noises, creaking, rattling, or grinding noise when shifting gears, which may indicate problems such as insufficient lubrication, worn bearings, or damaged seals. At the first sign of these faults, stop the vehicle for inspection or send it in for repair to prevent the damage from worsening. For uncertain noises, it is advisable to seek the help of a professional mechanic.