To troubleshoot a clutch, first identify the particular problem. Common clutch problems include defective clutch cylinders, bound cables, worn out pilot bearing and damaged clutch discs. Start with the simplest issues before proceeding to the more complex options.
If a clutch is slipping, the oil or grease on the clutch plate may be contaminated. Flush and replace discolored or contaminated oil or grease. Check if there is a defect in the release system, such as an improperly installed cable, and resolve it appropriately. If the problem persists, the binding slave cylinder or clutch master cylinder port might be blocked, and should be replaced.
If the clutch pedal depresses with little or no resistance, there might be a leaking or faulty clutch cylinder. A malfunctioning clutch cylinder is irreparable and must be replaced. If the clutch pedal is hard to depress, check for binding or sticking in the pedal linkage, cable or cross shaft. Worn out or blocked seals in the hydraulic system may also increase pedal effort.
If the clutch is making growling or squealing noises during operation, the input shaft bearing or release system bearings might be defective or worn out. If the sounds continue, lubricate the release fork and pilot bearings. If any of the above repair methods do not remedy the issue, contact a professional for assistance.