McCormick-Deering WK-40
McCormick-Deering WK-40 1937
McCormick-Deering WK-40 1937
Model history
Model introduced 1937
Model discontinued 1940
Model status Discontinued
No. produced 5,440 WK-40 and WD-40 in 1937-1940
Preceded by McCormick-Deering WA-40
Superseded by McCormick-Deering W-9
Engine Specification
Engine make International
Fuel type distillate
Power hp 50 belt, 35 drawbar
Governed rpm 1750
Displacement cu in /(litre) 298 ci
No. of Cylinders 6
Bore in (mm) 3.75 in
Stroke in (mm) 4.5 in
Cooling system Water
Naturally aspirated, Turbo or Supercharged NA
Transmission Details
Transmission type sliding gear
Gearbox make International
Forward 3
Reverse 1
Drive 2-WD
General Data
Linkage Category Drawbar
Tyre Sizes (std/options)
Front steel 34"x6"
Rear steel 50"x12"
Tractor Dimensions
Length (inches/metres) 142 in
Width (inches/meters) 66 in
Height (inches/meters) 67 in
Weight (nominal) lb/kg 6630 lb
Turning circle (nominal) inches/meters 34 ft
Wheelbase 85 in
Other info
Factories Milwaukee Works, Milwaukee, Wisconsin
Plow rating 4
Nebraska Tests No. 269
Approximate Cost new in (year) $1305 (1940)
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The McCormick-Deering WK-40 was built by International Harvester from 1937 to 1940.

Model historyEdit

For company history see main International Harvester article.

In 1937 McCormick-Deering WK-40 was an upgrade of the McCormick-Deering WA-40, with the engine increased to 298 ci and the rpm increased from 1,600 to 1,750. The same basic tractor was also built with a diesel engine as the McCormick-Deering WD-40. Similar industrial models were the McCormick-Deering ID-40 and International IK-40 and ID-40.

Timeline Edit

Factory locations Edit

International Harvester Milwaukee Works, Milwaukee, Wisconsin


See infobox for basic details

Variations and Options Edit

  • 4-speed transmission replaced 3-speed in 1938
  • Optional rubber tires
    • 1937
      • front: 7.50-20
      • rear: 12.75-32
    • 1938
      • front: 7.50-20
      • rear: 12.75-32, 13.50-32

Serial numbers and production figuresEdit

Year Serial run[1] Number Built[2] Notes (Total WK-40 and WD-40 built in 1937-1940 was 5,440).
1937 WKC5120-7664 2545 WK-40 & WD-40
1938 WKC7665-9755 2091 WK-40 & WD-40
1939 WKC9756-10322 567 WK-40 & WD-40
1940 WDC10323-10559 275 WK-40 & WD-40

Preserved modelsEdit

Add known examples in preservation ro the list below.

  • Bill Koski of Owosso, Michigan owns a restored WK-40.[3]

List of Preserved International W -40 series tractors
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Make + Model No. Reg No.
(if known)
Serial No. Build-Date Engine-Type/Make Owner
(if known)
Photo Were seen/Featured in Other info
McCormick-Deering WK-40 76 RNM WKC2277 1936 International Brian Bowles, Wrangle
International WK40 - IMG 7118
Carrington Steam and Tractor Rally 2011 Restored, Originally supplied new on steel wheels
McCormick-Deering W-40 unregistered WKC10053 1939 International 298 FFB Carl Hargreaves, Lancashire
Mccormick w40

McCormick-Deering W-40 Built in July 1939

Mid 1990's Canadian Import, Excellent running older restoration, with high speed top gear
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Make & model reg no serial no date built engine owner Image needed LHB

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Gallery Edit

Add extra photos here please.

See alsoEdit


  1. Wendel, C. H. 1981. 150 Years of International Harvester, Crestline Publishing Co., Sarasota, Florida. (serial numbers p.412)
  2. Klancher, Lee 1996. International Harvester Photographic History, Motorbooks International, Osceola, Wisconsin, p.71
  3. Leffingwell, Randy 1999. International Harvester Tractors, MBI Publishing Co., Osceola, Wisconsin. pp.107-109,190

External linksEdit