Fault Phenomenon: Yale GDP25 diesel forklift emits thick black smoke from the exhaust when accelerating, with reduced engine power and increased fuel consumption.

Troubleshooting Process:
– Checked air filter: element severely clogged.
– Checked turbocharger: insufficient boost pressure.
– Checked injector nozzles: poor atomization, dripping.
– Checked intake lines: no leaks.

Root Cause: Clogged air filter causes incomplete combustion, or faulty injector nozzles.

Required Parts: Air filter element or injector nozzle assembly.