Fault Phenomenon: General diesel forklift clutch pedal is very hard to depress.

Troubleshooting Process:
– Checked release bearing: bearing seized.
– Checked fork: fork broken.
– Checked pressure plate: pressure plate diaphragm spring broken.
– Checked hydraulics: air in hydraulic system.

Root Cause: The clutch release bearing is seized or the pressure plate diaphragm spring is broken.

Required Parts: Clutch assembly.