Mammoth Equipment & Exhausts

Why do SCRs on Komatsu haul trucks get clogged up?

Dec 19, 2023

The Komatsu 830 haul truck has an impressive payload capacity, and excels in efficiently transporting substantial volumes of minerals over challenging terrains. Prioritizing safety, the Komatsu 830 incorporates advanced braking systems and stability controls, creating a secure working environment for operators. Extensively used in large-scale mining operations, the Komatsu 830 proves indispensable for optimizing logistics, streamlining workflows, and meeting production targets.

One of the challenges with the Komatsu 830 is Selective Catalytic Reductor (SCR) clogging or crystalizing.

What is an SCR, and what does it do? 

  • SCR Definition: Selective Catalytic Reduction (SCR)
  • Purpose: Advanced emissions control technology in diesel engines
  • Objective: Reduce nitrogen oxide (NOx) emissions, harmful pollutants
  • Process: Injection of Diesel Exhaust Fluid (DEF) with urea into the exhaust stream
  • Reaction: DEF reacts with NOx in the presence of a catalyst
  • Result: Conversion of NOx into harmless nitrogen and water vapor.


Why do SCRs on Komatsu haul trucks get clogged or blocked up? 

  • DEF crystallization causes SCR system blockages and inefficiency.
  • DEF impurities lead to SCR system clogging issues.
  • Unburned hydrocarbons and ash contribute to SCR clogging.
  • Sulfur in fuel degrades SCR catalyst, causing clogs.
  • Oil entering exhaust system reduces SCR efficiency.


If your Komatsu 830 SCR has to be replaced, there are stock parts close to you

How can I reduce downtime caused by clogged SCRs on my haul truck? 

  • Preventative maintenance every 6 – 12 months
  • Ask if your SCR can be rebuilt 
  • Komatsu 830 parts are stocked for immediate replacement, or if you would like a swing unit. 


What is the process for getting my Komatsu SCR rebuilt? 


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