| Manufacturer | Hart-Parr |
| Price | 1,050(USD) |
| Model | 12-24 |
| Equipment Type | Standard-Tread Tractors |
| Factory | Charles City, Iowa, USA |
NEBRASKA TRACTOR TEST 107
| Description | 309 kerosene 2WD/October 14 - 23, 1924/Link: Nebraska Tractor Test 107 file/Drawbar performance/Gear 2 used for power test./Gear 1 used for pull test. |
| Belt power (max) | 26.97 hp/20.1 kW |
| Max power | 17.54 hp/13.1 kW |
| Max pull | 3,054 lbs/1385 kg |
HART-PARR 12-24 POWER
| Drawbar (claimed) | 12 hp/8.9 kW |
| Belt (claimed) | 24 hp/17.9 kW |
| Drawbar (tested) | 17.54 hp/13.1 kW |
| Belt (tested) | 26.97 hp/20.1 kW |
ENGINES OVERVIEW
The Hart-Parr 12-24 tractor features a robust Hart-Parr 5.1L or 5.5L 2-cylinder gasoline engine, delivering enhanced torque and power, ideal for medium-scale agricultural applications. The challenge lies in fuel efficiency relative to modern engines, which can impact operational costs. However, its vintage design can be advantageous for collectors and provides an authentic experience for restoration enthusiasts.
| Description | Hart-Parr 5.1L 2-cyl gasoline/Hart-Parr 5.5L 2-cyl gasoline |
ENGINE DETAIL 1
The Hart-Parr 12-24 tractor features a robust 2-cylinder liquid-cooled gasoline engine with a displacement of 308.9 ci (5.1 L), providing ample torque for heavy fieldwork. With a large bore and stroke of 5.50x6.50 inches (140x165 mm), the engine is optimized for low-end power, which is advantageous for plowing and hauling tasks at lower RPMs, rated at just 850. However, the lower RPM may limit its speed and efficiency in more demanding applications, making it better suited for steady, heavy-duty farm operations rather than high-speed tasks.
| Description | Hart-Parr/gasoline/2-cylinder/liquid-cooled |
| Displacement | 308.9 ci/5.1 L |
| Bore/Stroke | 5.50x6.50 inches/140 x 165 mm |
| Rated RPM | 850 |
ENGINE DETAIL 2
The Hart-Parr 12-24 features a robust 337.6 cubic inch (5.5 L) two-cylinder, liquid-cooled gasoline engine with a bore and stroke of 5.75 x 6.50 inches (146 x 165 mm), allowing for substantial torque delivery suitable for heavy fieldwork. With a low rated RPM of 850, it emphasizes durability and fuel efficiency, making it ideal for pulling and plowing tasks, though it may lack the speed for faster farming operations. Consider potential challenges with parts availability due to its vintage nature, which may impact repair and maintenance efforts.
| Description | Hart-Parr/gasoline/2-cylinder/liquid-cooled |
| Displacement | 337.6 ci/5.5 L |
| Bore/Stroke | 5.75x6.50 inches/146 x 165 mm |
| Rated RPM | 850 |
HART-PARR 12-24 ENGINES
The Hart-Parr 12-24 tractor features a robust Hart-Parr 5.1L or 5.5L 2-cylinder gasoline engine, providing a balance of power and efficiency for agricultural tasks. Key advantages include its reliable performance and longevity due to the simple design of the engine, which facilitates easier maintenance. However, potential challenges may arise from limited fuel efficiency compared to modern diesel alternatives, making it less ideal for extensive daily operations.
| Description | Hart-Parr 5.1L 2-cyl gasoline/Hart-Parr 5.5L 2-cyl gasoline |
TRANSMISSIONS OVERVIEW
The Hart-Parr 12-24 tractor features a 2-speed gear transmission with an option for a 3-speed setup, allowing for enhanced versatility in field operations. This configuration provides optimum torque management for varying soil conditions and workload requirements, making it suitable for both plowing and hauling tasks. However, the additional complexity of the 3-speed gearbox may lead to higher maintenance needs and potential challenges in operator training.
| Description | 2-speed gear/3-speed gear |
TRANSMISSION 1
The Hart-Parr 12-24 tractor features a simple gear system with 2 forward and 1 reverse gear, making it suitable for basic agricultural tasks. Its low gear range offers better torque for heavy pulling applications, though the limited gear options may challenge operators in varied terrain. This design is advantageous for straightforward operations, but may not be ideal for more complex fieldwork requiring frequent speed adjustments.
| Type | gear |
| Gears | 2 forward and 1 reverse |
TRANSMISSION 2
The Hart-Parr 12-24 tractor features a simple gear transmission system with 3 forward and 1 reverse gear, allowing for straightforward operation and ease of use in various agricultural settings. The limited gearing can be advantageous for specific tasks requiring consistent speed but may pose challenges in terrain requiring quick adaptations or varying speeds. This transmission system is ideal for small to medium farming operations focusing on consistent fieldwork rather than heavy-duty tasks requiring frequent gear changes.
| Type | gear |
| Gears | 3 forward and 1 reverse |
MECHANICAL
The Hart-Parr 12-24 features a 4x2 2WD chassis, providing simplicity in maintenance but limiting traction on uneven terrain. Its manual steering can lead to fatigue during extended usage, but offers straightforward functionality. The combination of 2-speed and 3-speed gear transmissions allows for versatile speed control, making it suitable for various farming tasks but may require operator skill to effectively manage gear changes.
| Chassis | 4x2 2WD |
| Steering | manual |
| Cab | Open operator station. |
| Transmissions | 2-speed gear/3-speed gear |
HART-PARR 12-24 TIRES
The Hart-Parr 12-24 tractor features a robust steel construction with front tires measuring 28x5 inches and rear tires at 46x10 inches, providing enhanced traction and stability for agricultural applications. Its rear tire size offers significant load-bearing capacity, making it suitable for heavy-duty tasks such as plowing and towing implements. However, the steel tire composition may result in reduced ride comfort on uneven terrain compared to modern pneumatic options, which could impact operational efficiency over extended use.
| Ag front | 28x5 (steel) |
| Ag rear | 46x10 (steel) |
DIMENSIONS
| Length | 116 inches/294 cm |
| Width | 66 inches/167 cm |
| Height | 56 inches/142 cm |
| Weight | 4440 lbs/2013 kg |
DIMENSIONS & TIRES
The Hart-Parr 12-24 tractor, weighing 4,440 lbs (2,013 kg), features large rear tires (46x10) for enhanced traction in rugged terrain, making it suitable for plowing and pulling heavy implements. However, its front tires (28x5) may limit stability during high torque applications, leading to challenges in weight distribution. Overall, this tractor is ideal for farming operations requiring significant power and off-road capability but may need additional ballast for optimal performance in challenging landscapes.
| Weight | 4440 lbs/2013 kg |
| Front tire | 28x5 |
| Rear tire | 46x10 |
12-24 SERIAL NUMBERS
| 1924 | 36001 (12-24 E) |
| 1925 | 36075 (12-24 E) |
| 1926 | 37101 (12-24 G) |
| 1927 | 37901 (12-24 H) |
| 1928 | 38119 (12-24 H) |
| 1929 | 39687 (12-24 H) |
| 1930 | 42279 (12-24 H) |