Fault Phenomenon: Schwing S600 clutch functions normally when cold. After frequent pedal operations (operating temperature), the clutch slave cylinder leaks oil, the pedal does not return, and eventually gear engagement is impossible.

Troubleshooting Process:
– Checked clutch fluid: fluid level sufficient.
– Checked slave cylinder exterior: no obvious cracks.
– Checked pedal mechanism: mechanism operates freely.
– Measured internal pressure of the slave cylinder at operating temperature: found pressure leakage.

Root Cause: The clutch slave cylinder piston cup ages due to heat, causing seal failure and oil leakage.

Required Parts: Clutch slave cylinder repair kit.