Fault Phenomenon: LiuGong HBT120A lubrication functions normally when cold. In high-temperature environments (operating temperature), the lubricating grease dries, friction surfaces wear, and eventually seize.

Troubleshooting Process:
– Checked grease type: type correct.
– Checked lubrication frequency: frequency normal.
– Checked grease fittings: fittings unobstructed.
– Measured friction surface temperature at operating temperature: found temperature too high.

Root Cause: The grease has poor temperature resistance, causing it to liquefy and dry out at high temperatures.

Required Parts: High-temperature grease and cleaning agent.