Overview
The Hart-Parr 28-50 is a 2WD standard-tread farm tractor manufactured in Charles City, Iowa, from 1927 to 1930. It is equipped with an 11.1L 4-cylinder liquid-cooled engine, a 2-speed gear transmission, and an open operator station with manual steering.
Ideal Applications
Tested Performance Capabilities:
Under Nebraska Tractor Test 140, the engine achieved a maximum belt power of 64.56 hp and a maximum drawbar pull of 7,347 lbs.
Transmission and Drive Configuration:
The mechanical layout features a gear-type transmission providing two forward speeds and one reverse speed operated via a mechanical dry disc clutch.
Chassis and Weight Specifications:
The tractor has a listed weight of 8,600 lbs and is fitted with 28x7 steel front tires and 51x14 steel rear tires.
Production
| Description | Standard-tread tractor / Built in Charles City, Iowa, USA / Original price was $2,085 in 1930 |
|---|---|
| Manufacturer | Hart-Parr |
Engine
| Engine type | Hart-Parr 11.1L 4-cyl gasoline |
|---|---|
| Air cleaner | dry |
| Bore/Stroke | 5.75x6.50 inches (146 x 165 mm) |
| Description | Hart-Parr / gasoline / 4-cylinder / liquid-cooled |
| Displacement | 675.1 ci (11.1 L) |
| Rated RPM | 850 |
| Belt (claimed) | 50 hp (37.3 kW) |
| Belt (tested) | 64.56 hp (48.1 kW) |
| Drawbar (claimed) | 28 hp (20.9 kW) |
| Drawbar (tested) | 46.03 hp (34.3 kW) |
Transmission
| Clutch | mechanical dry disc |
|---|---|
| Gears | 2 forward and 1 reverse |
| Transmission type | 2-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering |
| Drive type | Two-wheel drive |
Dimensions & Tires
| Weight | 8600 lbs (3900 kg) |
|---|---|
| Front tire | 28x7 |
| Rear tire | 51x14 |
| Weight | 8600 lbs (3900 kg) |
| Ag front | 28x7 steel |
| Ag rear | 51x14 steel |
28-50 Serial Numbers
| 1927 | 70501 |
|---|---|
| 1928 | 70742 |
| 1929 | 70968 |
| 1930 | 71402 |
| Description | FAQ: How to read a serial number table. |
Nebraska Tractor Test 140
| Belt power (max) | 64.56 hp (48.1 kW) |
|---|---|
| Description | Kerosene 2-speed 2WDAugust 17 - 31, 1927Link: Nebraska Tractor Test 140 file / Drawbar performance |
| Max power | 46.03 hp (34.3 kW) |
| Max pull | 7347 lbs (3332 kg) |