The Carl Moyer Program Off-Road Retrofit Exemptions

This page was last reviewed October 26, 2012

HUSS retrofit


Retrofit manufacturers have provided ARB with exemption letters that identify retrofits that are not compatible with specific pieces of equipment. The exemptions are only valid for the retrofit and the equipment models identified in the letter. This page also lists exemptions that have been subsequently revoked by the retrofit manufacturer.

For those pieces of equipment that have a retrofit exemption listed, there may be other verified retrofits available for that equipment. Available retrofits can be found in the verification database


HUSS’s FS-MK Filter System Exemptions

Equipment Name

Exemption

Exemption Date

Caterpillar C6 Slipform Paver S850

HUSS Exemption

June 17, 2009

Caterpillar C13 Slipform Concrete Paver

HUSS Exemption

June 17, 2009

Caterpillar C6.6 Truck Unloader

HUSS Exemption

June 17, 2009

Caterpillar 3406 Drive Over Truck Unloader

HUSS Exemption

June 17, 2009

Caterpillar 922C Wheel Loader

HUSS Exemption

June 13, 2008

Caterpillar D6K Dozer

HUSS Exemption

April 11, 2008

Caterpillar D8L Dozer

HUSS Exemption

May 21, 2008

Caterpillar D9 Track-Type Tractor

HUSS Exemption

October 25, 2007

Caterpillar D10 Track-Type Tractor

HUSS Exemption Revoked

May 5, 2008 for Tier 3 or cleaner Caterpillar C15 and smaller engines

HUSS Exemption

October 25, 2007

Caterpillar 627 Wheel Tractor Scraper

HUSS Exemption Revoked

May 5, 2008 for Tier 3 or cleaner Caterpillar C18 and smaller engines. Physical installations on C18 engines will be available starting July 1, 2008

HUSS Exemption

October 25, 2007

Caterpillar 637 Wheel Tractor Scraper

HUSS Exemption Revoked

May 5, 2008 for Tier 3 or cleaner Caterpillar C18 and smaller engines. Physical installations on C18 engines will be available starting July 1, 2008

HUSS Exemption

October 25, 2007

Caterpillar 651 Wheel Tractor Scraper

HUSS Exemption

October 25, 2007

Caterpillar 657 Wheel Tractor Scraper

HUSS Exemption Revoked

May 5, 2008 for Tier 3 or cleaner Caterpillar C18 and smaller engines. Physical installations on C18 engines will be available starting July 1, 2008

HUSS Exemption

October 25, 2007

Caterpillar 769 Haul truck

HUSS Exemption

December 12, 2007




Caterpillar's Diesel Particulate Filter Exemptions

Equipment Name

Exemption

Exemption Date

Caterpillar 12 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 14 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 16 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 24 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 120 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 135 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 140 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 143 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 160 Motor Grader

Caterpillar Exemption

June 30, 2008

Caterpillar 163 Motor Grader

Caterpillar Exemption

June 30, 2008


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