Atlas Copco AV compressor which was supplying air to controls as well as for service was found to be tripping on high temperature.

Stopped draining oil and charged fresh oil.

Removed oil cooler, cleaned and fixed back. Started the compressor, compressor found not working and motor overload alarms sounded.

Removed motor and found motor turning by hand smoothly while compressor sides totally seized. Dismantled the compressor and found oil inside completely caked up. Also all bearings seized. Dismantled one by one, cleaned up caked oil and fitted with spare bearings.

Tried out compressor and found satisfactory.
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