Mccormick Deering WK-40
Built: 1937-1940 · Series: Other models
← Predecessor: WA-40 · Successor: W-9 →
More machines from model year 1937
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McCormick-Deering – other models: from the 10-20 and 15-30 to International Harvester's W, O and I series, 17 to 50 hp, petrol, paraffin and diesel engines
This collective page gathers McCormick-Deering tractors outside the named series. McCormick-Deering was the tractor brand of the International Harvester Company (IHC), formed in 1902 from the merger of the McCormick Harvesting Machine Company and the Deering Harvester Company. The 10-20 (from 1923) and 15-30 (from 1921) were among the first mass-produced IHC tractors. Letter prefixes on later ranges denoted the application: W marked the standard version (W-30, W-40), O the low, shrouded orchard versions (O-12, O-14, OS-4, OS-6), I the industrial versions (I-12, IA-40, ID-40), and D denoted diesel power (WD-40, WD-9).
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The register lists 30 versions from 17 to 50 hp with four- and six-cylinder engines, overwhelmingly built by International, that is International Harvester, itself. Fuel choices included petrol, paraffin (kerosene) and diesel side by side, typical of American tractors from the 1920s to the 1940s, along with distillate fuel.
McCormick-Deering and the Farmall range that followed it made International Harvester the largest tractor maker in the United States during the 1920s and 1930s, ahead of John Deere and Ford. The W, O and I ranges each served their own market segment, from the standard farm through orchards to industrial use.
On these pre-war and early post-war tractors, the condition of the carburettor or paraffin pre-heating system, the cylinder head and the radiator matter most. On O models with their low bodywork, the shrouding is often damaged or missing entirely; on the industrial I versions, check the often non-standard tyres. Spares are supplied by an active network of American IHC specialists.
Sources: SpecCodex register, model data: Mccormick Deering (weitere Modelle)
Technical data
Engine
| Engine make | Internationalcorrect |
|---|---|
| Fuel | distillatecorrect |
| Power | 50 hpcorrect |
| Rated speed | 1,750 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 298 cicorrect |
| Bore | 3.75 in (95.2 mm)correct |
| Stroke | 4.5 in (114.3 mm)correct |
| Naturally aspirated | naturally aspiratedcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 142 in (3606.8 mm)correct |
|---|---|
| Width | 66 in (1676.4 mm)correct |
| Height | 67 in (1701.8 mm)correct |
| Wheelbase | 85 in (2,159 mm)correct |
| Turning circle | 34 ftcorrect |
| Unladen weight | 6,630 lbcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | sliding-gear transmissioncorrect |
| Gearbox make | Internationalcorrect |
| Forward gears | 3correct |
| Reverse gears | 1correct |
| Front tyres | steel 34"x6"correct |
| Rear tyres | steel 50"x12"correct |
Origin and approval
| Plant | Milwaukee Works, Milwaukee, Wisconsincorrect |
|---|---|
| Units built | 5, 440 WK-40 and WD-40 in 1937-1940correct |
Other data
| Drawbar output | 35correct |
|---|---|
| Linkage category | Drawbarcorrect |
| List price when new | $1305 (1940)correct |
| Predecessor | McCormick-Deering WA-40correct |
| Successor | McCormick-Deering W-9correct |
Frequently asked questions
How much power does the Mccormick Deering WK-40 have?
The Mccormick Deering WK-40 delivers 50 hp.
What engine does the Mccormick Deering WK-40 have?
6 cylinders, distillate.
When was the Mccormick Deering WK-40 built?
Production years: 1937-1940.
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 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 34 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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Other models in this series
Sources: Tractor & Construction Plant Wiki (retrieved August 2026) · How we check the data
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