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Hart-Parr 20

Hart-Parr 20 tractor
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The Hart-Parr 20 is a standard-tread farm tractor produced from 1920 to 1924 by Hart-Parr in Charles City, Iowa, USA. It was originally priced at $1,195 in 1924. The tractor features a two-cylinder liquid-cooled gasoline engine available in two displacements: 4.6L (281.4 ci) and a larger 5.1L (309 ci) used in the 20C model starting at serial number 35501. It has a 2-speed gear transmission with 2 forward and 1 reverse gears. The tractor delivers a claimed drawbar power of 10 hp and belt power of 20 hp, with tested drawbar power of 14.08 hp and belt power of 23.01 hp. It is a two-wheel drive with bull gear final drives, manual steering, and an open operator station. The tractor weighs 4440 lbs (2013 kg) and rides on 28x5 steel front tires and 46x10 steel rear tires.
Hart-Parr 20tractorspecificationsenginetransmissionpowerdimensions1920 tractorfarm tractor
Power22 hp[B]
Founded1920 - 1924
Model20

Technical Specifications

Detailed specifications and technical data for Hart-Parr 20

Power

Belt (tested):23.01 hp (17.2 kW)
Belt (claimed):20 hp (14.9 kW)
Drawbar (tested):14.08 hp (10.5 kW)
Drawbar (claimed):10 hp (7.5 kW)

Tires

Rear tire:46x10 steel
Front tire:28x5 steel

Engine

Note:The larger engine was used in the model 20C beginning at tractor serial number 35501.
Rated RPM 1:800
Bore/Stroke 1:5.25x6.50 inches (133 x 165 mm)
Bore/Stroke 2:5.50x6.50 inches (140 x 165 mm)
Displacement 1:281.4 ci (4.6 L)
Displacement 2:309 ci (5.1 L)
Engine options:Hart-Parr 4.6L 2-cyl gasoline, Hart-Parr 5.1L 2-cyl
Engine detail 1:Hart-Parr gasoline 2-cylinder liquid-cooled
Engine detail 2:Hart-Parr 2-cylinder liquid-cooled

Dimensions

Weight:4440 lbs (2013 kg)

Mechanical

Drive:Two-wheel drive
Steering:Manual steering
Final drives:bull gear
Operator station:Open operator station

Production

Type:Standard-tread tractor
Built in:Charles City, Iowa, USA
Manufacturer:Hart-Parr
Original price:$1,195 in 1924
Years produced:1920 - 1924

Transmission

Type:gear
Gears:2 forward and 1 reverse

Serial numbers

1920:35001
1921:35025
1922:35200
1922 (20C):35501
1923 (20C):35522
1924 (20C):35750