| Manufacturer |
Hart-Parr |
| Price |
2,085(USD) |
| Model |
28-50 |
| Equipment Type |
Standard-Tread Tractors |
| Factory |
Charles City, Iowa, USA |
NEBRASKA TRACTOR TEST 140
| Description |
Kerosene 2-speed 2WD/August 17 - 31, 1927/Link: Nebraska Tractor Test 140 file/Drawbar performance |
| Belt power (max) |
64.56 hp/48.1 kW |
| Max power |
46.03 hp/34.3 kW |
| Max pull |
7347 lbs/3332 kg |
HART-PARR 28-50 POWER
| Drawbar (claimed) |
28 hp/20.9 kW |
| Belt (claimed) |
50 hp/37.3 kW |
| Drawbar (tested) |
46.03 hp/34.3 kW |
| Belt (tested) |
64.56 hp/48.1 kW |
ENGINE DETAIL
The Hart-Parr 28-50 tractor features a robust 4-cylinder gasoline engine with a substantial displacement of 675.1 ci (11.1 L), providing significant torque for heavy-duty applications. Its generous bore (5.75 inches) and stroke (6.50 inches) contribute to excellent low-end power, while the liquid cooling system aids in maintaining optimal operating temperatures during extended use. However, the rated RPM of only 850 may limit its top-end speed, making it most suitable for slow, heavy pulls rather than high-speed agricultural work.
| Description |
Hart-Parr/gasoline/4-cylinder/liquid-cooled |
| Displacement |
675.1 ci/11.1 L |
| Bore/Stroke |
5.75x6.50 inches/146 x 165 mm |
| Air cleaner |
dry |
| Rated RPM |
850 |
HART-PARR 28-50 ENGINE
The Hart-Parr 28-50 is powered by an 11.1L 4-cylinder gasoline engine, providing substantial torque and horsepower, which is advantageous for heavy-duty agricultural tasks. Its large displacement allows for efficient fuel combustion, but may also lead to higher operational costs and increased maintenance challenges due to the complexity of a gasoline engine compared to diesel alternatives. This tractor is ideal for extensive farming applications, where power and reliability are critical, but users should be aware of the potential for greater fuel consumption and engine wear over time.
| Description |
Hart-Parr 11.1L 4-cyl gasoline |
TRANSMISSION
The Hart-Parr 28-50 features a simple gear system with 2 forward and 1 reverse gear, making it suitable for basic agricultural tasks but limiting versatility in varied terrain. Its mechanical dry disc clutch provides reliable engagement but may require more maintenance than modern hydraulic options. This tractor is ideal for smaller farms or vintage machinery enthusiasts, though its outdated technology could pose challenges in efficiency and ease of operation.
| Type |
gear |
| Gears |
2 forward and 1 reverse |
| Clutch |
mechanical dry disc |
MECHANICAL
The Hart-Parr 28-50 features a 4x2 2WD chassis, which offers simplicity and ease of maintenance but may struggle with traction on uneven terrain. Its manual steering requires more physical effort, leading to potential fatigue during long operational hours. The 2-speed gear transmission provides basic versatility in speed selection, beneficial for light fieldwork but may lack the range needed for heavy-duty tasks or varying soil conditions.
| Chassis |
4x2 2WD |
| Steering |
manual |
| Cab |
Open operator station. |
| Transmission |
2-speed gear |
HART-PARR 28-50 TIRES
The Hart-Parr 28-50 tractor features a robust steel construction with agricultural front wheels sized 28x7 and rear wheels at 51x14, providing enhanced traction and stability on diverse terrain. Its configuration allows for efficient power transfer, crucial for heavy-field operations, although the weight may limit maneuverability in tight spaces. Ideal for large-scale farming, it excels in plowing and hauling but may present challenges in transport over paved roads due to its substantial footprint.
| Ag front |
28x7 steel |
| Ag rear |
51x14 steel |
DIMENSIONS
DIMENSIONS & TIRES
The Hart-Parr 28-50's robust weight of 8600 lbs (3900 kg) provides excellent stability and traction, especially suitable for heavy-duty agricultural tasks. Its large rear tires (51x14) enhance power transfer and grip on uneven terrain, while the smaller front tires (28x7) facilitate maneuverability. However, the weight distribution may challenge steering precision on softer soils; thus, it is ideal for firmer ground conditions or applications requiring significant pulling power.
| Weight |
8600 lbs/3900 kg |
| Front tire |
28x7 |
| Rear tire |
51x14 |
28-50 SERIAL NUMBERS
| 1927 |
70501 |
| 1928 |
70742 |
| 1929 |
70968 |
| 1930 |
71402 |
