Hart Parr 18-36
Built: 1926–1930 · Series: Other models
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Hart-Parr 18-36: proprietary two-cylinder petrol tractor, 8,200 cc, 36 hp/23.8 kW at 800 rpm and 2,838 kg weight, built in the United States in the 1920s
Hart-Parr was an American tractor manufacturer, one of the pioneers of tractor building, and by the 1920s one of the established brands in the North American farm machinery market. The two-part type designation then in use, such as 18-36, gave separately the drawbar pull rating and the belt output, two different measurement points on the same machine.
Read on 3 more paragraphs
The 18-36 is powered by its own Hart-Parr two-cylinder petrol engine of 8,200 cc, producing 36 hp, or 23.8 kW, at 800 rpm. At a weight of 2,838 kg, the machine is a heavy, low-revving tractor whose top speed of 4.8 km/h was built purely for draft work, not for road travel.
A two-cylinder petrol engine of over 8 litres running at just 800 rpm delivers its torque already in the lowest rev range and was typical of early American tractor design, built for pulling power at the plough and belt drive for stationary threshing machines. A tractor of this design was intended for heavy field work and driving stationary machinery via the belt, not for fast transport runs.
When buying such an old Hart-Parr, the condition of the cylinders, pistons and cooling of the proprietary two-cylinder engine matters, along with corrosion on the frame and sheet-metal parts. Also worth checking are the clutch and gearbox for wear, plus the belt pulley for stationary work; parts for an American tractor of this age are, in Europe, only obtainable from specialist collectors and vintage-vehicle restorers.
Sources: SpecCodex-Register: Kennwerte des Modells Hart-Parr 18-36
Technical data
Engine
| Engine make | Hart-Parrcorrect |
|---|---|
| Fuel | petrolcorrect |
| Power | 36 hp (23.8 kW)correct |
| Rated speed | 800 rpmcorrect |
| Cylinders | 2correct |
| Displacement | 8,200 cm³correct |
| Naturally aspirated | naturally aspiratedcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Unladen weight | 2,838 kg (6,100 lbs)correct |
|---|
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 2/1-manual gearbox gearboxcorrect |
| Gearbox make | Hart-Parrcorrect |
| Forward gears | 2correct |
| Reverse gears | 1correct |
| Front tyres | 28"×5" Stahlcorrect |
| Rear tyres | 51"×12" Stahlcorrect |
| Top speed | 4.8 km/hcorrect |
Origin and approval
| Plant | Charles City, Iowa, USAcorrect |
|---|---|
| Construction | frame constructioncorrect |
| Units built | 14,695correct |
Other data
| Linkage category | Noncorrect |
|---|---|
| Predecessor | Hart-Parr 16-30correct |
Where this model stands
Power-to-weight ratio: 8.4 kW/t (24 kW / 2.8 t)
Power class: Compact (< 40 hp)
Stronger than 19% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Hart Parr 18-36 have?
The Hart Parr 18-36 delivers 36 hp.
How much does the Hart Parr 18-36 weigh?
The unladen weight is 2,838 kg.
What engine does the Hart Parr 18-36 have?
2 cylinders, 8,200 cm³ displacement, Benzin.
When was the Hart Parr 18-36 built?
Production years: 1926–1930.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 27 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · Tractor & Construction Plant Wiki (CC BY-SA 3.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
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