Fault Phenomenon: Demag single girder crane electric trolley wheels slip on the rail during startup or braking.

Troubleshooting Process:
– Checked rail surface: contaminated with oil.
– Checked wheel load: insufficient wheel load.
– Cleaned oil from rail, adjusted trolley counterweight or wheel load.

Root Cause: Oil contamination on the rail surface reduced the coefficient of friction, or insufficient wheel load.

Required Parts: Industrial cleaner.