HOLT CAT Emissions Solutions

Machine, Truck, & Stationary Engine Emissions Solutions

We offer a variety of solutions that can help you meet more stringent emission standards and may provide operational benefits.


HOLT CAT® provides emissions reduction solutions as well as awareness and support of the ever-changing emissions compliance challenges. We support our customers' green initiatives by delivering sustainable solutions including emissions reduction technologies, new, clean emissions equipment and Cat® legacy machines and engines. We offer our customers cost-effective solutions that protect their investments while meeting challenging national, state, and local environmental emissions regulations, including:

  • Advanced Tier IV diesel engines;
  • Low-emission natural gas engines;
  • Repowers (engine replacements);
  • Engine upgrade kits (updating an engine with newer lower emissions components);
  • Diesel particulate filters (85% or greater engine PM reduction);
  • Diesel and gas oxidation catalysts (85% Carbon Monoxide Reduction);
  • Three-way catalysts; and 
  • Selective catalytic reduction (SCR) technology.

Let us help you determine which clean emissions products and services provide the right solution for your applications. We are committed to continue as the leader in providing emissions solutions for Caterpillar® customers as well as a complete range of products, services, and processes for the best economic solutions for customers' needs.


HOLT CAT offers a full line of Tier 4 Interim engines for every application--with optimized emissions solutions tailored for each application.

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The use of exchange components reduces the consumption of resources that would have been used for manufacturing new parts, requires fewer additional parts for installation, speeds repairs and reduces your machine's downtime.

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