Tractor · 1923Unverified
Hart-Parr 40
Hart-Parr 40 — Standard-tread tractor · 22 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
22 hp
Max power
21.1 kW
Weight
3402 kg
Hover a source tag to verify
Overview
ManufacturerHart-ParrReference
Standard-tread tractorReference
Built in Charles City, Iowa, USAReference
Original price was $2,250 in 1927Reference
Two-wheel driveReference
Manual steeringReference
Open operator station.Reference
Engine
Hart-Parr 10.1L 4-cyl gasolineReference
Drawbar (claimed)16.4 kWReference
Belt (claimed)29.8 kWReference
Drawbar (tested)21.1 kWReference
Belt (tested)34.6 kWReference
Hart-ParrReference
gasolineReference
4-cylinderReference
liquid-cooledReference
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.Reference
Displacement10.1 LReference
Bore/Stroke140 x 165 mmReference
Rated RPM800Reference
Belt power (max)34.6 kWReference
Max power21.1 kWReference
Transmission
2-speed gearReference
TypegearReference
Gears2 forward and 1 reverseReference
Clutchmechanical contracting bandReference
Dimensions
Weight3402 kgReference
Front tire28x5Reference
Rear tire52x13Reference
Ag front28x5 (steel)Reference
Ag rear52x13 (steel)Reference
Length355 cmReference
Width243 cmReference
Height170 cmReference
40 Serial Numbers
192370001Reference
192470020Reference
192570095Reference
192670251Reference
192770491Reference
Final70500Reference
FAQ: How to read a serial number table.Reference
Capacities
Diameter35 cmReference
Width22 cmReference
RPM800Reference
Speed838.20 meters/minReference
Test results
Kerosene 2-speed 2WDJuly 10 - 19, 1923Link: Nebraska Tractor Test 97 fileReference
Belt fuel use (max)23.8 l/hourReference
Drawbar performanceReference
Max pull2190 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.