Sources and field evidence
Catalog Archive: Baseline specifications compiled from historical manufacturer archives and equipment registries. Laboratory test report verification in progress.
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Engineering & Capability Benchmark
Specific output, tractive ratio, and segment percentile
Engine and power specifications
- Engine model
- Caterpillar
- Fuel type
- Diesel
- Rated horsepower
- 44 hp
- Rated PTO Power
- N/A (Caterpillar specification)
- Drawbar Power @ Rated Engine Speed
- 35.06 hp (Nebraska OECD Test 2218)
- Cylinders
- 4
- Displacement
- 5.1 L (312.1 ci)
- Bore / stroke
- 4.25x5.50 inches 108 x 140 mm
- Rated RPM
- 1400 RPM
- Crankcase oil capacity
- N/A
- Coolant capacity
- N/A
Maintenance picks for the RD4
Filters, oil and common wear parts for this model.
Transmission and chassis specifications
- Transmission type
- Gear (5F/1R)
- Gears (forward / reverse)
- 5 forward / 1 reverse
- Drive system
- Tracks (Crawler)
- Wheelbase
- N/A
- Front tire
- N/A
- Rear tire
- N/A
- Hydraulic flow
- N/A
- Rear hitch
- N/A
Implement Draft & Ballast Matcher
Simulate draft resistance, drawbar power transfer, and optimal axle weight distribution for Caterpillar RD4.
Engine demand (70.4 HP) exceeds rated power (44 HP). Reduce working speed by 1.0-1.5 mph or reduce working width.
Catalog archival serial-number ranges
| Production year | Starting serial # | Ending serial # | Assembly plant |
|---|---|---|---|
| 1936 | #41 | #43,662 | Factory not specified |
| 1937 | #43,663 | #48,857 | Factory not specified |
| 1938 | #48,858 | #49,911 | Factory not specified |
| 1939 | #49,912 | End of run | Factory not specified |
Instant Used Market Valuation Projector
Algorithmic resale estimate for Caterpillar RD4 (1935)
Direct Segment Rivals & Showdowns
Head-to-head match-ups calibrated by horsepower and era
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Caterpillar
USA • 49 Models
Caterpillar Inc., commonly known as CAT, is a globally dominant American manufacturer of heavy machinery and industrial equipment. Founded in 1925 through the merger of Holt Manufacturing Company and C.L. Best Tractor Co., Caterpillar quickly established itself as a pioneer in tracked machinery and diesel engine technology. The company's early innovations in crawler tractors revolutionized construction and earthmoving industries, setting the stage for its future dominance. While Caterpillar's primary focus has been on construction, mining, and heavy industrial equipment, the company has also made significant contributions to agriculture. In 1987, Caterpillar re-entered the agricultural market with the introduction innovative Challenger line of rubber-tracked crawlers, which represented a major technological advancement in farm machinery. However, in 2002, Caterpillar made the strategic decision to sell its agricultural division, including the Challenger line, to AGCO, allowing it to concentrate on its core construction and mining equipment business. Today, Caterpillar is recognized as the world's leading manufacturer of construction and mining equipment, with a vast product portfolio that includes engines, industrial turbines, and heavy machinery. The company's commitment to innovation, quality, and global reach is supported by the largest dealer network in the industry, ensuring that Caterpillar equipment is available and supported worldwide. Despite its reduced presence in agriculture, Caterpillar's legacy in the farm equipment sector remains significant, particularly through the technological advancements introduced by the Challenger line.
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