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When the 1. failure phenomenon starts, the clutch pedal close to the complete relaxation of the car can start. After the clutch engagement, the engine can not be completely passed on to the driving wheel, and the engine speed is too high but the speed increases slowly when the car starts difficult, rising, driving or accelerating. 2. the main cause of the failure and the basic reason for the handling method of the clutch slipping is that the pressure plate can not be firmly pressed on the driven disc friction plate, or the friction coefficient of the friction plate can be passed through the concrete reasons and the treatment methods are mainly: 1) the diaphragm spring fatigue, cracking or failure, should be replaced. 2) the friction plate burns, hardens, oil or the friction disc of the driven plate is too thin, and repairs or replace it as the case may be. 3) improper adjustment of clutch control mechanism causes the pedal free travel to be too small and should be adjusted. 4) separating bearing and separating movement hairpin can not be returned, should be lubricated or replaced. 5) the deformation and wear of the pressure plate or flywheel should be grated or replaced by 6). For the use of mechanical cable type manipulating mechanism, it is possible to lubricate and replace the tension of the cable and the failure of the self adjusting device. 7) the clutch main cylinder of the clutch hydraulic control mechanism is not good. It should be overhauled or replaced. 3. diagnosis method of fault diagnosis of clutch slip is: tighten up the car, hang on the low speed gear, slowly relax the clutch pedal and gradually reduce the opening, the engine still does not run, indicating that the clutch is skidding. The basic reason for clutch skidding is that the friction torque of clutch main and driven parts is insufficient, and the output torque of engine can not be transmitted to transmission system. After confirming that the clutch slips, check according to the following steps: 1) check the free travel of the clutch pedal. The clutch free travel should comply with the original regulations, such as no free travel or free travel. The adjustment of the free travel of the hydraulic operated clutch is to unscrew the locking nut and adjust the push rod so as to shorten the length of the push rod until the free stroke meets the requirement. Adjustment of the free travel of the clutch operated clutch: release the locking nut, adjust the adjusting nut, shorten the effective length of the jacket, and make the free stroke meet the requirement. The self-adjusting cables should be checked according to the relevant manual to check whether the self adjustment function is normal. 2) remove the clutch lower cover for vehicles that can remove the clutch lower cover, check the return position of the detachable bearing and the height of the separation lever. There is a free gap between the separation bearing and the separation lever during the clutch engagement of the non self regulating clutch, which will make the non self regulating clutch more free travel on the clutch pedal. If the split fork is released with the release of the clutch pedal, the separation bearing is still on the inner end of the separation lever, which indicates that the inner end of the separation lever is too high. The height of the inner end of the separation lever should be adjusted according to the regulations, so that the front end face of the separation bearing and the separation bearing can be kept in a certain clearance. During the clutch split pump, when the clutch joins, the spring in the clutch sub pump pushes the piston, the push rod and the outside end of the working cylinder backwards. The separation and dialing and the working cylinder push rod have no clearance and no adjustment. The separation bearing is lightly touched by the inner end of the diaphragm spring under the cone spring force of the working cylinder. Rotate away from fingers, but do not press the separation fingers. 3) check whether the clutch cover bolts are loose. 4) check whether the friction disc is too worn or stained with grease. From the inspection hole to check the cleaning condition around the clutch of the clutch, if there are oil pollution, erosion marks or the powder left by wear, it should be further dismantled to check the wear of the driven friction disc, the peg exposure, the ablation and so on, and find out the cause of the ablation. 5) check whether the compression spring is damaged or insufficient. 6) check the flatness error of the working surface of the pressure plate and flywheel. 7) check whether the engine bearing is loose or shifted. For a vehicle with mechanical transmission lever type clutch control mechanism, part of the transmission rod system is connected with the vehicle frame and the engine cylinder block. If the engine support of the automobile is broken, the engine will jump off the car frame when the car accelerates, so that the clutch transmission rod is moved and pressure is applied to the separation fork to push the separation bearing pressure to the clutch pressure plate, causing the clutch disc to slip between the flywheel and the pressure plate.