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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, as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at 10,000 pounds (4,500 kg), and used Caterpillar's D4400 engine, an inline four-cylinders, with a 4.25 by 5.50 inches (108 mm × 140 mm) bore and stroke. 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 horsepower (32 kW) 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 in (1,100 mm)
• 7U = Wide Gauge 60 in (1,500 mm)
• 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 D4C - 1959-63
• Caterpillar D4D - 1963-77
• Caterpillar D4E - 1977-84
• Caterpillar D4H - 1985-96
• Caterpillar D4C SII -1990-93
• Caterpillar D4C SIII - 1993

Tracked 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
• Heavy equipment
• G-numbers Army cats.
• TM 9-2800 military vehicles
• SNL G151 light tractor

References

1. Orleman, Eric C. (2006) Caterpillar Motorbooks, St. Paul, Minnesota, page 38, ISBN 0-7603-2553-7
2. Leffingwell, Randy (1996) Classic Farm Tractors: History of the Farm Tractor Motorbooks International, Osceola, Wisconsin, page 70, ISBN 0-7603-0246-4
3. Archived February 24, 2008, at the Wayback Machine
4. Caterpillar Chronicle by Eric C.Orlemann, published by MBI
5. Caterpillar Pocket Guide, by Bob LaVoie
6. ^ Caterpillar by Eric Orlemann, pub by MBI, ISBN 0-7603-0529-3

External links

• Caterpillar Inc. vehicles
• Tractors
• Tracked vehicles
• Bulldozers