Fault Phenomenon: CAT base equipment (rotary drilling rig) black smoke from exhaust during operation, engine RPM cannot increase.

Troubleshooting Process:
– Checked air filter: air filter severely clogged.
– Checked turbocharger: turbocharger faulty.
– Checked injector nozzles: poor atomization.
– Checked fuel: poor quality or water contamination.

Root Cause: The air filter was not replaced for a long time, causing high intake resistance and incomplete combustion.

Required Parts: Replace air filter element.