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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.
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 (vehicle), trailer or machinery such as that used in agriculture, mining or constructio ...
is a small bulldozer
A bulldozer or dozer (also called a crawler) is a large tractor equipped with a metal #Blade, blade at the front for pushing material (soil, sand, snow, rubble, or rock) during construction work. It travels most commonly on continuous tracks, ...
manufactured by Caterpillar Inc.
Caterpillar Inc., also known as Cat, is an American construction, mining and other engineering equipment manufacturer. The company is the world's largest manufacturer of construction equipment.
In 2018, Caterpillar was ranked number 73 on the ' ...
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
The Caterpillar D5 is a small track-type bulldozer manufactured by Caterpillar Inc. The original D5 series was only produced in 1939. The current D5 series being produced is the D5K.
Versions
* D5 (9M) was originally built in 1939, with only ...
* Caterpillar D3
* Caterpillar D2
* Heavy equipment
Heavy equipment, heavy machinery, earthmovers, construction vehicles, or construction equipment, refers to heavy-duty vehicles specially designed to execute construction tasks, most frequently involving earthwork operations or other large con ...
* 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 ...
Army cats.
* TM 9-2800 military vehicles
* SNL G151 light tractor
References
External links
{{Caterpillar Caterpillar Inc. vehicles Tractors Tracked vehicles Bulldozers Vehicles introduced in 1936