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Tractor · 1920Unverified

Hart-Parr 20

Name: Hart-Parr 20
Brand: Hart-Parr

Hart-Parr 20 — Standard-tread tractor · 10 hp. Reference specifications; pending source verification.

The Hart-Parr 20 is a compact tractor, rated at 10 hp, making it suitable for smaller-scale applications. Manufactured from 1920 to 1924, this model features a 2-cylinder petrol liquid-cooled engine, which drives through a 2-speed gearbox and two-wheel drive system. The Hart-Parr 20 weighs 2013 kg and is designed for use on approximately 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

10 hp

Max power

10.5 kW

Weight

2013 kg

Catalogue coverage

Variants represented

Richest spec table

44 rows

Recorded power

10 hp

Recorded weight

2013 kg

Transmissions

2-speed gear

Production years

1920-1924

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerHart-ParrReference

Standard-tread tractorReference

Built in Charles City, Iowa, USAReference

Original price was $1,195 in 1924Reference

Two-wheel driveReference

Final drivesbull gearReference

Manual steeringReference

Open operator station.Reference

Engine

Hart-Parr 4.6L 2-cyl gasolineReference

Hart-Parr 5.1L 2-cylReference

Drawbar (claimed)7.5 kWReference

Belt (claimed)14.9 kWReference

Drawbar (tested)10.5 kWReference

Belt (tested)17.2 kWReference

Hart-ParrReference

gasolineReference

2-cylinderReference

liquid-cooledReference

Displacement4.6 LReference

Bore/Stroke133 x 165 mmReference

Rated RPM800Reference

The larger engine was used in the model 20C beginning at tractor serial number 35501.Reference

Displacement5.1 LReference

Bore/Stroke140 x 165 mmReference

Belt power (max)17.2 kWReference

Max power10.5 kWReference

Transmission

2-speed gearReference

TypegearReference

Gears2 forward and 1 reverseReference

Dimensions

Weight2013 kgReference

Front tire28x5Reference

Rear tire46x10Reference

Ag front28x5 steelReference

Ag rear46x10 steelReference

20 Serial Numbers

192035001Reference

192135025Reference

192235200Reference

192235501 (20C)Reference

192335522 (20C)Reference

192435750 (20C)Reference

FAQ: How to read a serial number table.Reference

Test results

Kerosene 2-speed 2WDJune 11 - 17, 1921Link: Nebraska Tractor Test 79 fileReference

Drawbar performanceReference

Max pull1134 kgReference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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