Hart-Parr 18-28: all source data
All 39 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production| Manufacturer | Hart-Parr (a part of Oliver) |
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| (no label) | Standard-tread tractor |
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| (no label) | Built in Charles City, Iowa, USA |
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Engine| (no label) | Oliver 4.6L 4-cyl kerosene |
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| Fuel tank | 14 gal | 53.0 L |
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| Aux. fuel | 1 gal | 3.8 L |
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Transmission| (no label) | 3-speed gear |
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Power| Drawbar (claimed) | 18 hp | 13.4 kW |
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| Belt (claimed) | 28 hp | 20.9 kW |
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| Drawbar (tested) | 23.56 hp | 17.6 kW |
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| Belt (tested) | 30.29 hp | 22.6 kW |
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Mechanical| (no label) | Two-wheel drive |
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| (no label) | Manual steering |
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| (no label) | Open operator station. |
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Dimensions| Wheelbase | 72.5 inches | 184 cm |
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| Weight | 3800 to 4165 pounds |
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| Front tire | 28x5 |
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| Rear tire | 44x10 |
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Belt pulley| Diameter | 14.25 inches | 36 cm |
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| Width | 7.25 inches | 18 cm |
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| RPM | 726 |
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| Speed | 2709 ft/min | 825.70 meters/min |
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Engine
Engine detail| (no label) | Oliver |
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| (no label) | kerosene |
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| (no label) | 4-cylinder |
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| (no label) | liquid-cooled |
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| Displacement | 280.6 ci | 4.6 L |
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| Bore/Stroke | 4.125x5.25 inches | 105 x 133 mm |
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| Coolant capacity (Coolant) | 32 qts | 30.3 L |
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Transmission
Transmission| Type | gear |
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| Gears | 3 forward and 1 reverse |
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Dimensions
Tires| Ag front | 28x5 |
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| Ag rear | 44x10 |
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Dimensions| Wheelbase | 72.5 inches | 184 cm |
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| Length | 112 inches | 284 cm |
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| Width | 61 inches | 154 cm |
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| Height (hood) | 53.5 inches | 135 cm |
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| Shipping weight | 3800 lbs | 1723 kg |
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| Operating weight | 4165 lbs | 1889 kg |
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