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In 1956, J.B. and J.T. (Tom) Hawthorne were awarded the San Diego Caterpillar dealership. In 2005, Tee Ness acquired Hawthorne Cat® from Tom Hawthorne. Tee actively oversees all of Hawthorne's divisions.

Hawthorne is committed to partner with their customers, satisfying their needs with exceptional construction equipment products and services, supported by an empowered team who demonstrate strong work ethic, integrity and teamwork. This type of focus has and will continue to allow Hawthorne to grow well into the next fifty years.

Hawthorne Cat Divisions

Hawthorne serves various industries including heavy construction, general building construction, earthmoving, excavation, quarry and aggregate, landscaping, marine, paving, waste management, engine power, power generation and grounds maintenance.

Machinery Division - Located in Rancho Bernardo, this is the corporate headquarters for all the Hawthorne divisions. In addition, it is home for sales, product support, parts, service, marketing, and finance personnel, who are the hub of Hawthorne's staff of over 450 employees worldwide. Our 4 locations here in Southern California comprise over 30 Acres and over 150,000 Square Feet of Shop and Office Space. Our Service Shops have over 42 Fully Loaded Service Bays. We have dozens of overheads cranes to include up to 10 tons of lifting capability and over 50,000 sp ft of Shop Space and 42 Service Bays. We are one of only a few service facilities that has an Engine Dynometer. We are one of the select Caterpillar Dealers that can tear down and rebuild engines and components from a core. Our state of the art facilities showcase metal lathes, a 30,000 ft/lbs torque wrench, line boring services, a stress relief machine, paint booths (up to our largest equipment), end mills, auto welders and the capability to re shape and re-skin moldboards, dozer blades and buckets. Our Rancho Bernardo facility has over an acre of land that is covered by 12” of concrete. These types of capabilities allow us to tackle any job and we consistently produce the highest quality work.

Power Systems Division - Provides sales, rentals and services the power generation, marine, on-highway trucking, and other engine-related markets. It has outstanding skills in building, rebuilding and packaging engines and power systems of all sizes from standby power to turnkey generators and cogeneration plants. Located in Kearny Mesa, this division has branches in Hawaii and Guam. Visit their website at

Rental Service Division - Offers rental equipment to the construction and industrial market including the rental of heavy and compact equipment, generators, lighting, welders, compressors, dump trucks and more from Caterpillar and other allied brands. This division has branches in San Diego, Hawaii and Guam. Visit their website at

Hawaii Division - Located in Waipahu, this division provides sales, rentals, parts and service of Caterpillar equipment, power generation and engines. It also represents other allied brands to complement its product line. Eight branch facilities are located throughout the region on Oahu (Waipahu), Hawaii (Hilo and Kona), Maui, Kauai, Guam and Saipan. Visit their website at 

Samoa Division - Located in Pago Pago, this division fills the marine and construction equipment needs in American Samoa. This facility provides complete sales, parts, and service staff to the worldwide tuna fleet, the construction industry, power plants, and all aspects of the industrial markets. Visit their website at

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