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The Caterpillar D4 track-type tractor is a small bulldozer manufactured by Caterpillar Inc. Caterpillar first introduced the RD4 in 1936〔Orleman, Eric C. (2006) ''Caterpillar'' Motorbooks, St. Paul, Minnesota, (page 38 ), ISBN 0-7603-2553-7〕 as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at 10,000 pounds, and used Caterpillar's D4400 engine, an inline four-cylinders, with a 4.25x5.50 inch bore and stroke.〔Leffingwell, Randy (1996) ''Classic Farm Tractors: History of the Farm Tractor'' Motorbooks International, Osceola, Wisconsin, (page 70 ), ISBN 0-7603-0246-4〕 In 1935 Caterpillar had started the naming convention of "RD" for diesel or "R" for regular gasoline, followed by a number to indicate the relative engine size.〔()〕 In 1937 the "R" was dropped, and just a "D" was used for the diesel versions. At the time of introduction of the RD4, the D4400 engine produced about 43 HP at the drawbar so the 4 indicated the relative engine power. The D4 U series was fitted with the more powerful D315 engine. The later D4 series engines quickly increased in power, so the number "4" just became a figure of merit rather than indicating actual engine power. ==Version details== *6U = Narrow gauge 44" *7U = Wide Gauge 60" * Caterpillar RD4 - 1936-37 (4G) with 4-cylinder D4400 engine〔Caterpillar Chronicle by Eric C.Orlemann, published by MBI〕 * Caterpillar D4 - 1937-39 (4G) with 4-cylinder D4400 engine * Caterpillar D4 - 1939-43 (7J) with 4-cylinder D4400 engine * Caterpillar D4 - 1943-45 (2T) with 4-cylinder D4400 engine * Caterpillar D4 - 1945-47 (5T) with 4-cylinder D4400 engine * Caterpillar D4 - 1947-59 6U1 > 6U12781, 7U1-7U44307 Cat 4-cylinder D315 engine.〔Caterpillar Pocket Guide, by Bob LaVoie〕 * Caterpillar D4C - 1959-63〔Caterpillar by Eric Orlemann, pub by MBI, ISBN 0-7603-0529-3〕 * Caterpillar D4D - 1963-77〔 * Caterpillar D4E - 1977-84〔 * Caterpillar D4H - 1985-96〔 * Caterpillar D4C SII -1990-93〔 * Caterpillar D4C SIII - 1993〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Caterpillar D4」の詳細全文を読む スポンサード リンク
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