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Tier IV Technology

Understanding the latest technologies

  • Learn how Komatsu assures compliance with state-of-the-art emissions reduction technology
  • Keep your machines running efficiently with helpful Tier IV maintenance tips
Komatsu Diesel Particulate Filter (KDPF)

What is it?

Komatsu engines are designed to integrate KDPF consisting of a Komasu Diesel Oxidation Catalyst (KDOC) and Komatsu Catalyzed Soot Filter (KCSF). The KDPF removes soot through a process called "regeneration" that collects inorganic materials that form during engine combustion.

Maintenance tips

Recommended service intervals for KDPF are 4,500 hours and 9,000 hours.


Selective Catalytic Reduction (SCR) and
Diesel Exhaust Fluid (DEF)

What is it?

SCR is an advanced active emissions control feature that injects DEF into the exhaust stream of a diesel engine. When DEF is injected at the proper rate, NOx is broken down into non-toxic water (H2O) and nitrogen gas (N2).

Maintenance tips

Regularly check DEF fluid level, just as you check fuel levels. Komatsu equipment continuously displays the DEF level gauge on the right side of the monitor screen. In addition, when the refill timing* is reached, the DEF low level guidance appears as a pop up display to inform the operator in real time.


Heavy-duty Cooled Exhaust Gas Recirculation (CEGR) System

What is it?

CEGR circulates portions of the exhaust gas into the air intake in order to lower combustion temperatures and reduce emissions. The cooling cycle of the system also helps reduce fuel consumption for additional machine efficiency.

Maintenance tips

CEGR machines generally require passive and manual regeneration cycles to heat the diesel particulate filter and burn off accumulated particulates. On many Komatsu machines, passive re-gen occurs periodically during normal operation. Manual regeneration may also be required, depending on the operation and machine guidelines, and should be completed before the machine is started. Check the operator's manual for specific guidelines.


Komatsu Variable Geometry Turbocharger (KVGT) System

What is it?

Komatsu's KVGT system uses hydraulic pressure to control the amount of air being fed to the engine according to current machine load conditions. Using the machine's control system, the KVGT provides precise exhaust temperature management for the regeneration process and also reduces soot where it's created, in the engine's cylinders.

Maintenance tips

Consult your operator's manual, and follow recommended guidelines for replacing engine oil and air filters to maintain KVGT efficiency. A clogged air filter will reduce air flow and can result in excessive smoke, increased oil consumption, and low machine power.


Heavy-Duty High-Pressure Common Rail (HPCR)
Fuel Injection System

What is it?

The HPCR system utilizes computer controls to ensure the proper injection of high-pressure fuel. Building on the technology in previous Komatsu engines, the improved HPCR system uses higher pressure injection to reduce both particulate matter (PM) emissions and fuel consumption.

Maintenance tips

Water can wreak havoc on your HPCR system, so be sure to check your fuel filters and water separators often to prevent water accumulation in the fuel tank.


More information

latest version of Komatsu's technology the Tier IV Technology

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