Fault Phenomenon: General diesel forklift engine lacks power, exhaust emits black smoke, fuel consumption increases.

Troubleshooting Process:
– Checked air filter restriction indicator: indicator red.
– Checked filter element: element severely clogged.
– Checked intake pipe: no leaks.
– Checked environment: high dust levels.

Root Cause: High dust in the operating environment, and the air filter was not replaced for a long time, causing blockage.

Required Parts: Air filter element.