Overview
The Hart-Parr 28-44 is a standard-tread farm tractor produced in Charles City, Iowa, between 1930 and 1937. It is powered by a 7.3L four-cylinder kerosene engine and features a three-speed gear transmission with a 540 rear PTO. According to Nebraska Tractor Test 183, the unit recorded a maximum belt power of 49.04 hp and a maximum drawbar pull of 5,116 lbs.
Ideal Applications
Nebraska Test Performance:
During official testing, the tractor achieved 49.04 hp on the belt and 34.21 hp at the drawbar while consuming 4.9 gallons of kerosene per hour at maximum power.
Mechanical and Tire Configuration:
The tractor is built on an 80-inch wheelbase with an operating weight of 6,415 lbs and is equipped with steel wheels measuring 29x6 inches in the front and 46x12 inches in the rear.
Belt Pulley and PTO Specifications:
This model includes a 16.75-inch diameter belt pulley operating at 596 RPM for a speed of 2,600 feet per minute, along with a standard 540 rear PTO.
Production
| Description | Standard-tread tractor / Built in Charles City, Iowa, USA |
|---|---|
| Manufacturer | Hart-Parr (a part of Oliver) |
Engine
| Engine type | Hart-Parr 7.3L 4-cyl kerosene |
|---|---|
| Fuel tank | 34 gal (128.7 L) |
| Bore/Stroke | 4.75x6.25 inches (121 x 159 mm) |
| Coolant capacity | 42 qts (39.7 L) |
| Description | Hart-Parr / kerosene / 4-cylinder / liquid-cooled |
| Displacement | 443 ci (7.3 L) |
| Rated RPM | 1125 |
| Belt (claimed) | 44 hp (32.8 kW) |
| Belt (tested) | 49.04 hp (36.6 kW) |
| Drawbar (claimed) | 22 hp (16.4 kW) |
| Drawbar (tested) | 34.21 hp (25.5 kW) |
| Plows | 3-5 |
Transmission
| Gears | 3 forward and 1 reverse |
|---|---|
| Transmission type | 3-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering |
| Drive type | Two-wheel drive |
PTO
| Rear PTO Type | 540 |
|---|
Dimensions & Tires
| Height (hood) | 59.5 inches (151 cm) |
|---|---|
| Length | 125.75 inches (319 cm) |
| Operating weight | 6415 lbs (2909 kg) |
| Shipping weight | 5565 lbs (2524 kg) |
| Wheelbase | 80 inches (203 cm) |
| Width | 65 inches (165 cm) |
| Front tire | 29x6 |
| Rear tire | 46x12 (steel) |
| Weight | 5565 to 6415 pounds |
| Wheelbase | 80 inches (203 cm) |
| Ag front | 29x6 (steel) |
| Ag rear | 46x12 (steel) |
28-44 Serial Numbers
| 1930 | 500001 |
|---|---|
| 1931 | 503599 |
| 1932 | 506185 |
| 1933 | 506212 |
| 1934 | 506255 |
| 1935 | 506401 |
| 1936 | 507176 |
| 1937 | 508016 |
| Description | FAQ: How to read a serial number table. |
| Final | 508917 |
Belt Pulley
| Diameter | 16.75 inches (42 cm) |
|---|---|
| RPM | 596 |
| Speed | 2600 ft/min (792.48 meters/min) |
| Width | 8.25 inches (20 cm) |
Nebraska Tractor Test 183
| Belt fuel use (max) | 4.9 gal/hour (18.5 l/hour) |
|---|---|
| Belt power (max) | 49.04 hp (36.6 kW) |
| Description | Kerosene 3-speed 2WDOctober 13 - 27, 1930Link: Nebraska Tractor Test 183 file / Drawbar performance / Gear 2 used for power test. / Gear 1 used for pull test. |
| Max power | 34.21 hp (25.5 kW) |
| Max pull | 5,116 lbs (2320 kg) |
References
| Description | Oliver Hart-Parr Tractors published in 1930 |
|---|