Oliver 90/99
Built: 1937–1952 · Series: 90-SERIE
More machines from model year 1937
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Oliver 90/99: American four-cylinder tractor of the 90 Series with 33 kW output and 7.26 litres of displacement, built between 1937 and 1952
Oliver was an American tractor manufacturer based in South Bend, Indiana, later absorbed into the White Motor Corporation. The 90 Series was, for many years, the most powerful model in the Oliver line-up.
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The 90/99 is powered by a water-cooled four-cylinder engine of 7.26 litres, built to run on petrol or kerosene, delivering 33 kW at 1,125 rpm, roughly 44.9 hp. At an unladen weight of 2,812 kg, a height of 1,521 mm, a length of 3,372 mm, a width of 1,651 mm and a wheelbase of 2,032 mm, the machine has a design top speed of 11 km/h.
A displacement of 7.26 litres spread over just four cylinders means considerably more volume per cylinder than smaller tractor engines of the time, giving high torque at low speed for heavy drawbar work such as ploughing and cultivating. The low speed of 1,125 rpm at large displacement was typical of the heaviest American farm tractors of the period, which favoured durability and steady pull; the low top speed of 11 km/h confirms a design aimed at fieldwork.
When buying an Oliver 90/99, check compression and oil consumption on each cylinder, since large individual cylinder volumes show wear more clearly. The condition of the cylinder head and valves should also be checked on such an old engine, along with the carburettor, cooling system and clutch.
Sources: SpecCodex-Register: Kennwerte des Modells Oliver 90/99, Oliver Farm Equipment Company (Wikipedia)
Technical data
Engine
| Fuel | Benzin / Kerosincorrect |
|---|---|
| Power | 44.9 hp (33 kW)correct |
| Rated speed | 1,125 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 7,260 cm³correct |
| Bore | 120.65 mmcorrect |
| Stroke | 158.75 mmcorrect |
| Compression ratio | 4.1correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,372 mmcorrect |
|---|---|
| Width | 1,651 mmcorrect |
| Height | 1,521 mmcorrect |
| Wheelbase | 2,032 mmcorrect |
| Unladen weight | 2,812 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 4 V/1 Rcorrect |
| Forward gears | 4correct |
| Reverse gears | 1correct |
| Front tyres | 7.50 x 18correct |
| Rear tyres | 12.75 x 28correct |
| Top speed | 11 km/hcorrect |
Working data
| Fuel tank capacity | 128.7 lcorrect |
|---|
Origin and approval
| Construction | frame constructioncorrect |
|---|---|
| Units built | 9,295correct |
Where this model stands
Power-to-weight ratio: 11.7 kW/t (33 kW / 2.8 t)
Power class: Universal (40–100 hp)
Stronger than 29% 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 90/99 have?
The Oliver 90/99 delivers 44.9 hp.
How much does the Oliver 90/99 weigh?
The unladen weight is 2,812 kg.
What engine does the Oliver 90/99 have?
4 cylinders, 7,260 cm³ displacement, Benzin / Kerosin.
How fast does the Oliver 90/99 go?
Top speed is 11 km/h.
What are the dimensions of the Oliver 90/99?
3,372 mm × 1,651 mm × 1,521 mm.
When was the Oliver 90/99 built?
Production years: 1937–1952.
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 25 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: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.