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
- Hart-Parr
- Fuel type
- Unknown
- Rated horsepower
- 44 hp
- Rated PTO Power
- N/A (Hart-Parr specification)
- Drawbar Power @ Rated Engine Speed
- 20 hp (Nebraska OECD Test 2218)
- Cylinders
- N/A
- Displacement
- N/A
- Bore / stroke
- N/A
- Rated RPM
- N/A
- Crankcase oil capacity
- N/A
- Coolant capacity
- N/A
Maintenance picks for the 20-40
Filters, oil and common wear parts for this model.
Transmission and chassis specifications
- Transmission type
- N/A
- Gears (forward / reverse)
- N/A
- Drive system
- Unknown
- 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 Hart-Parr 20-40.
Ballast distribution and traction efficiency depend directly on chassis drive type. Please select your tractor's configuration:
Engine demand (83.4 HP) exceeds rated power (44 HP). Reduce working speed by 1.0-1.5 mph or reduce working width.
Instant Used Market Valuation Projector
Algorithmic resale estimate for Hart-Parr 20-40 (1912)
Direct Segment Rivals & Showdowns
Head-to-head match-ups calibrated by horsepower and era
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Hart-Parr
USA • 21 Models
Hart-Parr is a historical brand in the agricultural machinery and lawn equipment sector, renowned for its pioneering contributions to the development of tractors. Founded in the United States in 1901, Hart-Parr is recognized as one of the earliest manufacturers of gasoline-powered tractors, playing a crucial role in the mechanization of agriculture. The brand is celebrated for its innovation in tractor design and engineering, which significantly advanced farming efficiency and productivity during the early 20th century. Hart-Parr tractors were known for their reliability and durability, making them a popular choice among farmers. Over time, the company underwent various changes, including mergers and acquisitions, which eventually led to its integration into larger entities. Despite these transformations, Hart-Parr's legacy endures in the agricultural machinery industry, symbolizing the early advancements in tractor technology that paved the way for modern farming equipment.
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