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Hart-Parr 40

Hart-Parr 40 tractor
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The Hart-Parr 40 is a standard-tread farm tractor produced from 1923 to 1927 by Hart-Parr in Charles City, Iowa, USA. It features a 10.1L 4-cylinder gasoline engine built from two two-cylinder blocks on a single crankshaft, with early models having two carburetors and later models a single carburetor. The tractor has a 2-speed gear transmission with mechanical contracting band clutch, two-wheel drive, and manual steering with an open operator station. It delivers a claimed 22 hp at the drawbar and 40 hp at the belt, with tested power outputs higher. The tractor weighs 7500 lbs and rides on steel tires sized 28x5 front and 52x13 rear. The original price was $2,250 in 1927.
Hart-Parr 40tractorfarm tractorspecificationsenginetransmissionpowerdimensionsHart-Parr
Power44 hp[B]
Founded1923 - 1927
Model40

Technical Specifications

Detailed specifications and technical data for Hart-Parr 40

Power

Belt (tested):46.40 hp (34.6 kW)
Belt (claimed):40 hp (29.8 kW)
Drawbar (tested):28.23 hp (21.1 kW)
Drawbar (claimed):22 hp (16.4 kW)

Engine

Type:Hart-Parr 10.1L 4-cyl gasoline
Details:The Hart-Parr 22-40 used a pair of two-cylinder engine blocks from the 20C on a single crankshaft to create the four-cylinder engine. Early models used two carburetors while later models had a single carburetor to feed both blocks.
Rated RPM:800
Bore/Stroke:5.50x6.50 inches (140 x 165 mm)
Displacement:617.7 ci (10.1 L)

Mechanical

Drive:Two-wheel drive
Steering:Manual steering
Operator station:Open operator station

Production

Type:Standard-tread tractor
Built in:Charles City, Iowa, USA
Manufacturer:Hart-Parr
Original price:$2,250 in 1927
Years produced:1923 - 1927

Belt Pulley

RPM:800
Speed:2750 ft/min (838.20 meters/min)
Width:9 inches (22 cm)
Diameter:14 inches (35 cm)

Transmission

Type:gear
Gears:2 forward and 1 reverse
Clutch:mechanical contracting band

Serial Numbers

1923:70001
1924:70020
1925:70095
1926:70251
1927:70491
Final:70500

Dimensions & Tires

Width:96 inches (243 cm)
Height:67 inches (170 cm)
Length:140 inches (355 cm)
Weight:7500 lbs (3402 kg)
Rear tire:52x13 (steel)
Front tire:28x5 (steel)