Hart-Parr

Hart-Parr 18-28

The Hart-Parr 18-28 is a standard-tread farm tractor produced from 1930 to 1936 by Hart-Parr, a part of Oliver, built in Charles City, Iowa, USA. It features an Oliver 4.6L 4-cylinder liquid-cooled kerosene engine, a 3-speed gear transmission with 3 forward and 1 reverse gears, and two-wheel manual steering with an open operator station. The tractor has a wheelbase of 72.5 inches, length of 112 inches, width of 61 inches, and a hood height of 53.5 inches. It weighs between 3800 and 4165 pounds. The power output is rated at 18 hp drawbar claimed and 28 hp belt claimed, with tested drawbar power of 23.56 hp and belt power of 30.29 hp. Tires are sized 28x5 front and 44x10 rear. The belt pulley diameter is 14.25 inches with a width of 7.25 inches, running at 726 RPM and a speed of 2709 ft/min.

Power31 hp[B]

Founded1930 - 1936

Model18-28

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Technical Specifications

Detailed specifications and technical data for Hart-Parr 18-28

Power

Belt (tested)	30.29 hp (22.6 kW)
Belt (claimed)	28 hp (20.9 kW)
Drawbar (tested)	23.56 hp (17.6 kW)
Drawbar (claimed)	18 hp (13.4 kW)

Tires

Ag rear	44x10
Ag front	28x5

Engine

Make	Oliver
Cooling	liquid-cooled
Aux. fuel	1 gal (3.8 L)
Cylinders	4-cylinder
Fuel tank	14 gal (53.0 L)
Fuel type	kerosene
Bore/Stroke	4.125x5.25 inches (105 x 133 mm)
Displacement	280.6 ci (4.6 L)
Coolant capacity	32 qts (30.3 L)

Dimensions

Width	61 inches (154 cm)
Length	112 inches (284 cm)
Wheelbase	72.5 inches (184 cm)
Height (hood)	53.5 inches (135 cm)
Shipping weight	3800 lbs (1723 kg)
Operating weight	4165 lbs (1889 kg)

Mechanical