Causes Of Clutch Release Bearing Damage

The damage of clutch release bearing is closely related to the operation, maintenance and adjustment of the driver. The reasons for damage are as follows:

1) Overheating caused by excessive working temperature

Many drivers often half-step on the clutch when turning or slowing down, and some drivers even put their feet on the clutch pedal after shifting gears; some vehicles have too much free travel adjustment, which makes the clutch not completely separated and is in a semi-engaged and semi-separated state. This state causes dry friction and generates a large amount of heat to be transferred to the release bearing. When the bearing is heated to a certain temperature, the butter melts or dilutes and flows, which further increases the temperature of the release bearing. When the temperature reaches a certain level, it burns out.

2) Wear due to lack of lubricating oil

The clutch release bearing is lubricated with butter. There are two ways to add butter. For 360111 release bearings, the rear cover of the bearing should be opened and filled with grease during maintenance or when the transmission is removed, and then the rear cover can be reassembled; for 788611K release bearings, they can be removed and boiled in melted grease, and then taken out after cooling to achieve the purpose of lubrication. In actual work, drivers tend to ignore this point, resulting in lack of oil in the clutch release bearing. The wear of the release bearing without lubrication or with little lubrication is often several to dozens of times that of the wear after lubrication. As the wear increases, the temperature will also increase greatly, which makes it easier to damage.

3) The free stroke is too small or the number of loads is too many

According to the requirements, the clearance between the clutch release bearing and the release lever is generally 2.5mm, which is more suitable. The free stroke reflected on the clutch pedal is 30-40mm. If the free stroke is too small or there is no free stroke at all, the release lever and the release bearing will be in a constant engagement state. According to the fatigue damage principle, the longer the bearing works, the more serious the damage; the more times it is loaded, the more likely the release bearing will suffer fatigue damage. Moreover, the longer the working time, the higher the temperature of the bearing, the easier it is to burn, which reduces the service life of the release bearing.

4) In addition to the above three reasons, whether the release lever is adjusted flat and whether the release bearing return spring is good also has a great impact on the damage of the release bearing.