Fault Phenomenon: XCMG XKT mining truck engine exhaust temperature high, EGR system efficiency low, fault code reported.

Troubleshooting Process:
– Checked cooler: EGR cooler internal passages clogged with carbon deposits.
– Checked valve: EGR valve opening normal but flow low.
– Checked coolant: poor coolant circulation.
– Checked fuel: poor fuel quality causing excessive carbon buildup.

Root Cause: The internal passages of the EGR cooler are severely clogged due to accumulation of carbon particles and condensate from the exhaust gas, preventing effective cooling and recirculation of exhaust gas.

Required Parts: Disassemble and clean EGR cooler or replace assembly.