Overview
The Hart-Parr 12-24 is a standard-tread farm tractor produced in Charles City, Iowa, from 1924 to 1930. It features a two-cylinder liquid-cooled engine with displacements of 5.1L or 5.5L and was offered with either a two-speed or three-speed gear transmission. The tractor is configured with an open operator station, steel ag wheels, and manual steering, weighing 4,440 lbs.
Ideal Applications
Tested Power Output:
According to Nebraska Tractor Test 107, the tractor achieved a maximum belt power of 26.97 hp and a maximum drawbar pull of 3,054 lbs using kerosene fuel.
Engine and Mechanical Specs:
The unit is powered by a Hart-Parr 2-cylinder gasoline engine rated at 850 RPM, delivering a tested drawbar performance of 17.54 hp.
Physical Configuration:
The chassis is built with a 116-inch length and 66-inch width, supported by 28x5 steel front wheels and 46x10 steel rear wheels.
Production
| Description | Standard-tread tractor / Built in Charles City, Iowa, USA / Original price was $1,050 in 1930 |
|---|---|
| Manufacturer | Hart-Parr |
Engine
| Bore/Stroke | 5.50x6.50 inches (140 x 165 mm) / 5.75x6.50 inches (146 x 165 mm) |
|---|---|
| Description | Hart-Parr / gasoline / 2-cylinder / liquid-cooled / Hart-Parr / gasoline / 2-cylinder / liquid-cooled |
| Displacement | 308.9 ci (5.1 L) / 337.6 ci (5.5 L) |
| Rated RPM | 850 / 850 |
| Engine type | Hart-Parr 5.1L 2-cyl gasoline / Hart-Parr 5.5L 2-cyl gasoline |
| Engine type | Hart-Parr 5.1L 2-cyl gasoline / Hart-Parr 5.5L 2-cyl gasoline |
| Belt (claimed) | 24 hp (17.9 kW) |
| Belt (tested) | 26.97 hp (20.1 kW) |
| Drawbar (claimed) | 12 hp (8.9 kW) |
| Drawbar (tested) | 17.54 hp (13.1 kW) |
Transmission
| Gears | 2 forward and 1 reverse / 3 forward and 1 reverse |
|---|---|
| Type | gear / gear |
| Transmission type | 2-speed gear / 3-speed gear |
| Transmission type | 2-speed gear / 3-speed gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering |
| Drive type | Two-wheel drive |
Dimensions & Tires
| Height | 56 inches (142 cm) |
|---|---|
| Length | 116 inches (294 cm) |
| Weight | 4440 lbs (2013 kg) |
| Width | 66 inches (167 cm) |
| Front tire | 28x5 |
| Rear tire | 46x10 |
| Weight | 4440 lbs (2013 kg) |
| Ag front | 28x5 (steel) |
| Ag rear | 46x10 (steel) |
12-24 Serial Numbers
| 1924 | 36001 (12-24 E) |
|---|---|
| 1925 | 36075 (12-24 E) |
| 1926 | 36581 (12-24E) / 37101 (12-24 G) |
| 1927 | 37190 (12-24 G) / 37901 (12-24 H) |
| 1928 | 38119 (12-24 H) |
| 1929 | 39687 (12-24 H) |
| 1930 | 42279 (12-24 H) |
| Description | FAQ: How to read a serial number table. |
Nebraska Tractor Test 107
| Belt power (max) | 26.97 hp (20.1 kW) |
|---|---|
| Description | 309 kerosene 2WDOctober 14 - 23, 1924Link: Nebraska Tractor Test 107 file / Drawbar performance / Gear 2 used for power test. / Gear 1 used for pull test. |
| Max power | 17.54 hp (13.1 kW) |
| Max pull | 3,054 lbs (1385 kg) |