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​Where you can learn more?

Conduct simple internet search on EPA Tier 4 Emission Standards. There is plenty of material to help get you grounded in EPA Tier 4. The following links should help get you started:

Related Links

The Diesel Forum

General info on off-road diesel engines, equipment, retrofitting, etc.

Association of Equipment Manufacturers

Bobcat Website - Tier 4 Content

Catepillar websites

Cummins Website