Hart-Parr 20

The Hart-Parr 20 is a tractor produced by Hart Parr. It is equipped with a 309 ci 5.1 L engine. The rated power output is 23.01 hp 17.2 kW. Transmission: 2 forward and 1 reverse. Operating weight: 4440 lbs 2013 kg.

Overview

	1920 - 1924 Standard-tread tractor
1920 - 1924
Standard-tread tractor

Production
Manufacturer	Hart-Parr
Standard-tread tractor
Built in Charles City, Iowa, USA
Original price was $1,195 in 1924

Hart-Parr 20 Transmission
2-speed gear
Transmission details ...

Hart-Parr 20 Power
Drawbar (claimed)	10 hp 7.5 kW
Belt (claimed)	20 hp 14.9 kW
Drawbar (tested)	14.08 hp 10.5 kW
Belt (tested)	23.01 hp 17.2 kW
Performance test details ...

Mechanical
Two-wheel drive
Final drives	bull gear
Manual steering
Open operator station.

Dimensions & Tires
Weight	4440 lbs 2013 kg
Front tire	28x5
Rear tire	46x10
Full dimensions and tires ...

Engine

Engine options
Hart-Parr 4.6L 2-cyl gasoline
Hart-Parr 5.1L 2-cyl

Engine Detail — 281.4 ci / 4.6 L Gasoline

Manufacturer	Hart-Parr
Fuel Type	Gasoline
Configuration	2-cylinder, liquid-cooled
Displacement	281.4 ci 4.6 L
Bore/Stroke	5.25x6.50 inches 133 x 165 mm
Rated RPM	800

Engine Detail — 309 ci / 5.1 L

Manufacturer	Hart-Parr
Configuration	2-cylinder, liquid-cooled
The larger engine was used in the model 20C beginning at tractor serial number 35501.
Displacement	309 ci 5.1 L
Bore/Stroke	5.50x6.50 inches 140 x 165 mm

Transmission

Transmission — 2 forward and 1 reverse gear

Type	gear
Gears	2 forward and 1 reverse

Dimensions

Hart-Parr 20 Tires
Ag front	28x5 steel
Ag rear	46x10 steel

Dimensions
Weight	4440 lbs 2013 kg

Tests

Nebraska Tractor Test 79
Kerosene 2-speed 2WD June 11 - 17, 1921 Link: Nebraska Tractor Test 79 file
Belt power (max)	23.01 hp 17.2 kW
Drawbar performance
Max power	14.08 hp 10.5 kW
Max pull	2500 lbs 1134 kg

Photos

Hart-Parr 20C.