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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.
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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 Ă— 140 mm) bore and
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Caterpillar D4 - 1947-59 6U1 > 6U12781, 7U1-7U44307 Cat 4-cylinder D315 engine.
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Caterpillar RD4 - 1936-37 (4G) with 4-cylinder D4400 engine
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Caterpillar
Chronicle by Eric C.Orlemann, published by MBI
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Caterpillar D4 - 1945-47 (5T) with 4-cylinder D4400 engine
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Caterpillar D4 - 1943-45 (2T) with 4-cylinder D4400 engine
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Caterpillar D4 - 1939-43 (7J) with 4-cylinder D4400 engine
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Caterpillar D4 - 1937-39 (4G) with 4-cylinder D4400 engine
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The
Caterpillar D4 was used as the base tractor for the
204:Classic Farm Tractors: History of the Farm Tractor
23:Caterpillar D4H LGP (Low Ground Pressure) model,
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206:Motorbooks International, Osceola, Wisconsin,
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65:6U = Narrow gauge 44 in (1,100 mm)
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274:Caterpillar by Eric Orlemann, pub by MBI,
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68:7U = Wide Gauge 60 in (1,500 mm)
117:built loader that was known as the T4 or
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252:Caterpillar Pocket Guide, by Bob LaVoie
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348:Caterpillar Energy Solutions
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158:TM 9-2800 military vehicles
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104:Caterpillar D4C SIII - 1993
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821:Caterpillar, Inc. v. Lewis
424:Best Manufacturing Company
231:February 24, 2008, at the
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92:Caterpillar D4D - 1963-77
89:Caterpillar D4C - 1959-63
178:Orleman, Eric C. (2006)
429:Holt gas–electric tank
161:SNL G151 light tractor
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353:Electro-Motive Diesel
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500:Articulated haulers
368:Multidrive Vehicles
652:Challenger Tractor
358:Lincoln Industries
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465:George H. Prudden
450:Clarence Leo Best
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877:Tracked vehicles
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615:Road rollers
434:Holt tractor
343:Bucyrus-Erie
331:Subsidiaries
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783:Dealerships
763:Gas turbine
566:Haul trucks
559:345C L
455:Daniel Best
180:Caterpillar
120:Traxcavator
45:is a small
882:Bulldozers
861:Categories
637:Twenty-Two
554:Excavators
512:Bulldozers
166:References
155:Army cats.
40:track-type
846:Cat phone
768:Solar T62
667:M520 Goer
153:G-numbers
47:bulldozer
872:Tractors
627:Tractors
481:Vehicles
474:Products
388:Trackson
229:Archived
127:See also
123:shovel.
115:Trackson
25:Eschborn
814:Related
795:WesTrac
790:Finning
678:Engines
658:Trucks
620:CS-533E
598:Loaders
338:Bitelli
208:page 70
184:page 38
43:tractor
29:Germany
493:IDF D9
443:People
278:
214:
190:
662:CT660
632:Sixty
756:C280
751:C175
746:V16+
739:C280
717:3208
705:C280
695:3126
690:3116
608:930G
603:924G
591:797F
586:797B
414:Holt
276:ISBN
212:ISBN
188:ISBN
35:The
734:C32
729:C27
724:V12
700:C13
581:797
576:789
571:777
547:D11
542:D10
505:740
863::
712:V8
685:I6
647:D4
642:D2
537:D9
532:D8
527:D7
522:D6
517:D5
257:^
210:,
186:,
27:,
316:e
309:t
302:v
31:.
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