LeTourneau Technologies, Inc. was an American manufacturer of heavy construction equipment founded by R. G. LeTourneau. In 2011, the company was acquired by Joy Global.

R. G. LeTourneau founded R.G. LeTourneau, Inc. in California in 1929, as a contractor of earthmoving equipment, which manufactured products in Longview, Texas.^{[1][better source needed]}

During World War II, the company provided nearly 75% of the Allies' earthmoving equipment.^[2] In 1954, it built the first jack-up drilling rig.^{[citation needed]} In 1955, it made the first log-stacker machine.^{[citation needed]} In 1965, the company made the first straddle carrier.^{[citation needed][clarification needed]}

LeTourneau had spent the early 1950s perfecting a diesel-electric drivetrain for multi-wheeled heavy-machinery.^{[citation needed]} The system—somewhat similar in concept to the sort used on many locomotives –used a diesel combustion engine to spin an electric generator, which would send its power to hub motors mounted to each wheel of the vehicle.^[2] This allowed for multi-wheel-drive without differentials, driveshafts, or the drivetrain losses associated with them.^{[citation needed]}

For the Distant Early Warning Line (DEW line) project, Western Electric and Alaska Freightlines, with the help of TRADCOM (U.S. Army Transportation Research and Development Command), contracted to have a pair of off-road over-land trains, the TC-264 Sno-Buggy, designed specifically for Arctic conditions, to be built by LeTourneau Technologies. The TC-264 Sno-Buggy was the longest off-road vehicle ever built at the time, with its six cars (including the locomotive) measuring a total of 274 feet. Each car was driven by four 7.3 foot-tall wheels and tires. The 24-wheel-drive was powered by two 400 horsepower Cummins diesel engines connected to a hub motor. It had a payload capacity of 150 tons, and could traverse nearly any terrain. It had a very successful first season hauling freight to the DEW Line.^[3]

LeTourneau sold most of his company to Westinghouse Air Brake Company in 1953, for US$ 31M.^[2] In 1970, just after the death of the founder, the company^{[clarification needed]} was sold to Marathon Manufacturing Company and was renamed Marathon LeTourneau Company.^{[citation needed]}

In 1994, Rowan (now Valaris Limited), which had used the company to manufacture its drilling rigs, acquired the company from General Cable for $50 million.^[4][5]

In 2011, Rowan (now Valaris Limited) sold LeTourneau Technologies to Joy Global.^[6] Joy Global subsequently sold LeTourneau's Drilling, Marine, and Power divisions to Cameron International.^[7]

In 2016, Keppel Corporation acquired LeTourneau Offshore Products (jackups, cranes, and elevating units) from Cameron, while Cameron retained the LeTourneau Drilling Products division.^[8]

• Orlemann, Eric C. (2001). LeTourneau Earthmovers. St. Paul, Minnesota: Motorbooks International, MBI. ISBN 9780760308400.
• Niemela, John H.; Hardy, Dale. A History of R.G. LeTourneau's Earliest Scrapers: Culminating in the 1922 Mountain Mover (PDF). S2CID 162762371. Archived from the original (PDF) on 2019-08-01.
• LeTourneau, R.G. Mover of Men and Mountains, Autobiography (Prentice-Hall 1960, 1967; Reprint Moody Press 1967, 1972), ISBN 0-8024-3818-0
• "The LeTourneau Legend", Equipment history, ISBN 0-646-27692-1 (Global General Publishing Pty Ltd; 1995, 1998, 3rd revised edition 2007)
• "The LeTourneau Archive", Equipment history, ISBN 0-9585608-0-3 (Global General Publishing Pty Ltd; 2005)
• "WABCO Australia", LeTourneau Australia history, ISBN 0-9585608-1-1 (Global General Publishing Pty Ltd; 2007)
• "The WABCO Archive Wheel-Tractor Scrapers", Letourneau-Westinghouse scraper history, ISBN 978-0-9871503-0-1 (Global General Publishing Pty Ltd; 2011)

• "History". Keppel LeTourneau. Retrieved June 1, 2022.
• "Milestones in Rig design". Keppel LeTourneau. Retrieved June 1, 2022.