Fault Phenomenon: Caterpillar 966 wheel loader when water temperature is high, the fan speed does not increase accordingly, cooling effect poor.

Troubleshooting Process:
– Checked silicone clutch: bimetallic temperature-sensing strip failed or silicone leaked.
– Checked fan: fan blades deformed.
– Checked belt: belt tension normal.
– Checked temperature control: sensing element cannot sense hot air.

Root Cause: Silicone oil leaked from the fan silicone clutch, preventing the clutch from engaging, causing the fan to run at low speed continuously.

Required Parts: Replace fan silicone clutch assembly.