Oliver Hart Parr 70 HC/KD
Built: 1935–1937 · Series: 70-SERIE
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Oliver Hart Parr 70 HC/KD (1935-1937): six-cylinder farm tractor with a petrol-and-kerosene carburettor engine, 18.8 kW output and a top speed of 9.5 km/h from the 70-Series
Hart-Parr was one of the pioneers of American tractor building and was absorbed into the Oliver brand, under which the vehicles were sold as Oliver Hart-Parr from the mid-1930s onward. The 70 HC/KD from the 70-Series was built between 1935 and 1937 and belonged to the mid-range standard tractors of this transitional period.
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The six-cylinder engine, with a displacement of 3,300 cm³, is designed to run on petrol or kerosene, as was common for American tractors of this era: started on petrol and often switched to the cheaper kerosene once working in the field. At 1,500 rpm the engine delivers 18.8 kW, equivalent to 25.5 horsepower. With a weight of 1,588 kg, a wheelbase of 1,829 mm and a top speed of 9.5 km/h, the tractor was built for drawbar work rather than road travel.
Carburettor engines running on petrol and kerosene characterised American tractors of the 1920s and 1930s, before the diesel engine took over; their advantage was the lower price of kerosene, their drawback lower efficiency and higher consumption. The water cooling system required regular checking of the coolant level in the field, especially under full load during ploughing.
When buying a used Oliver Hart-Parr of this series, the condition of the carburettor and the petrol-to-kerosene switching mechanism is decisive, since these parts are missing or rebuilt on many surviving examples. The radiator and cylinder head gasket also deserve attention, as does the condition of the narrow tyres, which are rarely original on museum vehicles.
Sources: SpecCodex-Register: Kennwerte des Modells 70 HC/KD
Technical data
Engine
| Fuel | Benzin / Kerosincorrect |
|---|---|
| Power | 25.5 hp (18.8 kW)correct |
| Rated speed | 1,500 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 3,300 cm³correct |
| Bore | 79.38 mmcorrect |
| Stroke | 111.13 mmcorrect |
| Compression ratio | 6.5correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,429 mmcorrect |
|---|---|
| Width | 1,562 mmcorrect |
| Height | 1,343 mmcorrect |
| Wheelbase | 1,829 mmcorrect |
| Unladen weight | 1,588 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 4 V/1 R or 6 V/1 Rcorrect |
| Front tyres | 27" x 4, 5" (RC = 26, 5"x 6")correct |
| Rear tyres | 42" x 10" (RC = 55" x 0, 53125")correct |
| Top speed | 9.5 km/hcorrect |
Origin and approval
| Construction | frame constructioncorrect |
|---|---|
| Units built | 1.802 (RC = 16.925)correct |
Where this model stands
Power-to-weight ratio: 11.8 kW/t (19 kW / 1.6 t)
Power class: Compact (< 40 hp)
Stronger than 13% 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 Oliver Hart Parr 70 HC/KD have?
The Oliver Hart Parr 70 HC/KD delivers 25.5 hp.
How much does the Oliver Hart Parr 70 HC/KD weigh?
The unladen weight is 1,588 kg.
What engine does the Oliver Hart Parr 70 HC/KD have?
6 cylinders, 3,300 cm³ displacement, Benzin / Kerosin.
How fast does the Oliver Hart Parr 70 HC/KD go?
Top speed is 9.5 km/h.
What are the dimensions of the Oliver Hart Parr 70 HC/KD?
3,429 mm × 1,562 mm × 1,343 mm.
When was the Oliver Hart Parr 70 HC/KD built?
Production years: 1935–1937.
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.
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This page carries 22 individual figures for this model. They come from 1 recorded source; 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) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
