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Kubota diesel engines between 56 and 130 kW the first in the world to receive certification for CARB Tier 4 Interim Emission regulations

August 4, 2011

In recent years, with increased awareness about conserving the global environment, Kubota has placed top priority on ensuring environmental compatibility and reducing environmental impact. The next emission regulations for engines with an output range between 56 and 130 kW are slated to come into effect in 2012 in North America, Europe and Japan. Kubota has completed developing new off-highway diesel engines between 56 and 130 kW that comply with these regulations.
Recently, Kubota received the Tier 4 Interim certification from the California Air Resources Board and is the first company in the world to receive this certification for engines with a displacement of 4 liters or less.

1. Certification Summary

    1. Certified date: July 1, 2011
    2. Certification organization
      California Air Resources Board (CARB*1)
    3. Certification models
      Industrial liquid cooled diesel engine
      Engine displacement: 3.8 liters Specifications: Turbo and turbo intercooled for V3800 engines
    4. Remarks
      Kubota's 6.1 liter engines (V6108 engines) also received Tier 4 Interim certification on July 1

2. Other Certifications

Kubota Corporation has received certifications for EPA*2 (Tier 4 Interim) and Europe (Stage IIIB).

Certification model US Environmental Protection Agency (EPA) Europe
3.8L V3800 engines Turbo engine Certified date: 7/6 Certified date: 5/26
Turbo intercooled engine Certified date: 6/30
6.1L V6108 engines Turbo intercooled engine Certified date: 7/12 Certified date: 7/21

3. Kubota's Compliance with Tier 4 Interim Emission Regulations

  • Tier 4 Interim and Stage IIIB are very stringent regulations. They require further reduction of particulate matter (diesel soot) down to about 10% in comparison with the previous exhaust emission tier.
  • To ensure compliance with the new regulations, Kubota utilized a variety of technologies such as Common Rail System that has made it possible to optimize combustion by computer, Exhaust Gas Recirculation technology (EGR*3) and Diesel Particulate Filter (DPF*4). It is possible to create a more durable, quiet and fuel efficient engine with minimal impact on the engine package for easy installation.
  • Production of the V3800-CR-TE4 engines will begin in October 2011 and they will be mounted on Kubota brand tractors, harvesters and construction equipment. OEM engines will also be available for construction, generator, welder and other industrial market segments.
  1. *1.CARB: California Air Resources Board
  2. *2.EPA: The U.S. Environmental Protection Agency
  3. *3.EGR: Technique to reduce NOx by recirculating a portion of exhaust gas to the engine cylinder and reducing the oxygen content to a lower combustion temperature
  4. *4.DPF: Diesel particulate filter that traps particulate matter in the engine exhaust emission
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