Fault Phenomenon: Ruthmann Steiger 110 telescopic boom aerial work platform engine emits black smoke, cannot increase speed, boom action slow.

Troubleshooting Process:
– Checked air filter: element clogged.
– Checked fuel filter: filter has water or clogged.
– Checked turbocharger: turbocharger impeller stuck.
– Checked injector nozzles: poor atomization.

Root Cause: The air filter is severely clogged, causing insufficient intake air and incomplete combustion.

Required Parts: Air filter element.