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The Caterpillar D4 track-type
page 70
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 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.
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{{Caterpillar Caterpillar Inc. vehicles Tractors Tracked vehicles Bulldozers
The Caterpillar D4 track-type tractor
A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most commo ...
is a small bulldozer manufactured by Caterpillar Inc.
Caterpillar Inc. (stock symbol CAT) is an American ''Fortune'' 500 corporation and the world's largest construction-equipment manufacturer.
In 2018, Caterpillar was ranked number 65 on the ''Fortune'' 500 list and number 238 on the Global ''Fo ...
Caterpillar first introduced the RD4 in 1936 as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at , and used Caterpillar's D4400 engine, an inline four-cylinders, with a bore and stroke.Leffingwell, Randy (1996) ''Classic Farm Tractors: History of the Farm Tractor'' Motorbooks International, Osceola, Wisconsinpage 70
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 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 *7U = Wide Gauge * Caterpillar RD4 - 1936-37 (4G) with 4-cylinder D4400 engine * 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 - 1959-63Caterpillar by Eric Orlemann, pub by MBI, * Caterpillar D4D - 1963-77 * Caterpillar D4E - 1977-84 * Caterpillar D4H - 1985-96 * Caterpillar D4C SII -1990-93 * Caterpillar D4C SIII - 1993Tracked shovels
The Caterpillar D4 was used as the base tractor for the Trackson built loader that was known as the T4 or '' Traxcavator'' shovel.See also
* Caterpillar D5 * Caterpillar D3 * Caterpillar D2 *List of Caterpillar Inc. machines
Some of Caterpillar Incorporated's current and historic machines include:
* Track-type tractors (bulldozers)
** Caterpillar 10
** Caterpillar 15
** Caterpillar 20
** Caterpillar 25
** Caterpillar 30
** Caterpillar 35
** Caterpillar 40
** Caterp ...
* Heavy equipment
* G-numbers
This is the Group G series List of the United States military vehicles by (Ordnance) supply catalog designation, — ''one'' of the alpha-numeric "Standard Nomenclature Lists" (SNL) that were part of the overall List of the United States Army w ...
Army cats.
* TM 9-2800 military vehicles
* SNL G151 light tractor
References
External links
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{{Caterpillar Caterpillar Inc. vehicles Tractors Tracked vehicles Bulldozers