Johnson Matthey is a leading supplier of retrofit diesel emissions control systems for non-road machinery.


Johnson Matthey provides retrofit diesel emissions control systems for a variety of construction machines including excavators, loaders, bulldozers and dump trucks.
We can offer a range of diesel particulate filter sizes, filter types and regeneration methods to cover most applications.

These systems are normally suitable for use with a wide range of construction machinery, engine power ranges and engine emission levels.

It depends partly on how hard the engine is working during the normal operation of the machine as this affects the exhaust gas temperature which needs to be above a certain level for 50% of the time for these systems to regenerate reliably.

The other factor is the balance of NOx to particulate level in the exhaust gas, which is often determined by the certified emissions level of the engine.

A CRT® system has a diesel oxidation catalyst (DOC) in front of a filter that has not been coated with catalyst. The CCRT® system also has catalyst applied to the filter as well as using a DOC and this extends the operating window of the filter system to allow reliable regeneration with lower exhaust temperatures or lower NOx to particulate ratio in the exhaust gas.

Our specialists can advise which system is most suitable for your specific application.

Johnson Matthey CRT® and CCRT® systems have a long track record of reliable, trouble free operation in thousands of retrofits to construction machines.

For further information and to discuss your exact requirements please do not hesitate to contact us.

Case Study: DPF CCRT installed on 98kW wheel loader

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Case Study: DPFi with electrical regeneration installed on Volvo wheel loader

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