Hart-Parr
Hart-Parr 20
The Hart-Parr 20 is a standard-tread farm tractor produced from 1920 to 1924 by Hart-Parr in Charles City, Iowa, USA. It was originally priced at $1,195 in 1924. The tractor features a two-cylinder liquid-cooled gasoline engine available in two displacements: 4.6L (281.4 ci) and a larger 5.1L (309 ci) used in the 20C model starting at serial number 35501. It has a 2-speed gear transmission with 2 forward and 1 reverse gears. The tractor delivers a claimed drawbar power of 10 hp and belt power of 20 hp, with tested drawbar power of 14.08 hp and belt power of 23.01 hp. It is a two-wheel drive with bull gear final drives, manual steering, and an open operator station. The tractor weighs 4440 lbs (2013 kg) and rides on 28x5 steel front tires and 46x10 steel rear tires.
Power22 hp[B]
Founded1920 - 1924
Model20
Technical Specifications
Detailed specifications and technical data for Hart-Parr 20
Power
| Belt (tested) | 23.01 hp (17.2 kW) |
|---|---|
| Belt (claimed) | 20 hp (14.9 kW) |
| Drawbar (tested) | 14.08 hp (10.5 kW) |
| Drawbar (claimed) | 10 hp (7.5 kW) |
Tires
| Rear tire | 46x10 steel |
|---|---|
| Front tire | 28x5 steel |
Engine
| Note | The larger engine was used in the model 20C beginning at tractor serial number 35501. |
|---|---|
| Rated RPM 1 | 800 |
| Bore/Stroke 1 | 5.25x6.50 inches (133 x 165 mm) |
| Bore/Stroke 2 | 5.50x6.50 inches (140 x 165 mm) |
| Displacement 1 | 281.4 ci (4.6 L) |
| Displacement 2 | 309 ci (5.1 L) |
| Engine options | Hart-Parr 4.6L 2-cyl gasoline, Hart-Parr 5.1L 2-cyl |
| Engine detail 1 | Hart-Parr gasoline 2-cylinder liquid-cooled |
| Engine detail 2 | Hart-Parr 2-cylinder liquid-cooled |
Dimensions
| Weight | 4440 lbs (2013 kg) |
|---|
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Steering | Manual steering |
| Final drives | bull gear |
| Operator station | Open operator station |
Production
| Type | Standard-tread tractor |
|---|---|
| Built in | Charles City, Iowa, USA |
| Manufacturer | Hart-Parr |
| Original price | $1,195 in 1924 |
| Years produced | 1920 - 1924 |
Transmission
| Type | gear |
|---|---|
| Gears | 2 forward and 1 reverse |
Serial numbers
| 1920 | 35001 |
|---|---|
| 1921 | 35025 |
| 1922 | 35200 |
| 1922 (20C) | 35501 |
| 1923 (20C) | 35522 |
| 1924 (20C) | 35750 |