McCormick OS-6
McCormick-Deering OS-6, restored version captured at a California antique tractor show
Model history
Model introduced 1944
Model discontinued 1953
Model status Discontinued
Preceded by New model
Engine Specification
Engine make International
Engine model C-248
Fuel type gasoline
Power hp 37 belt, 32 drawbar
Governed rpm 1450
Displacement cu in /(litre) 248 ci
No. of Cylinders 4
Bore in (mm) 3.875 in
Stroke in (mm) 5.25 in
Cooling system water
Naturally aspirated, Turbo or Supercharged NA
Transmission Details
Transmission type sliding gear
Gearbox make International
Forward 5
Reverse 1
Drive 2-WD
General Data
Linkage Category drawbar
Tyre Sizes (std/options)
Front 6.00-16 4-ply
Rear 14-26 6-ply
Tractor Dimensions
Length (inches/metres) 133 in
Width (inches/meters) 60 in
Height (inches/meters) 62 in
Weight (nominal) lb/kg 4600 lb
Turning circle (nominal) inches/meters 25.5 ft
Wheelbase 76 in
Other info
Factories Rock Island, Illinois, USA
Plow rating 3-14"
Nebraska Tests No. 355
Approximate Cost new in (year) $2335 (1951)
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The McCormick-Deering OS-6 was an orchard tractor built by the International Harvester company from 1944 to 1953 in Rock Island, Illinois, USA.

Model historyEdit

For Company history see
Main article: International Harvester

The McCormick-Deering OS-6 was basically the O-6 without the shielding. It retained the lowered air intake and exhaust, headlights, seat, and controls.

Timeline Edit

  • 1940 - McCormick-Deering W-6 gasoline-powered standard-tread tractor replaced the W-30
  • 1940 - Later in year, O-6 orchard, based on W-6, replaced orchard version of W-30
  • 1944 - OS-6, without the shielding of the O-6, added
  • 1946 - Brand name shortened from McCormick-Deering to McCormick
  • 1953 - OS-6 discontinued

Factory locations Edit

  • Farmall Works, Rock Island, Illinois, USA

Specification Edit

See Infobox for basic details

  • Standard tires
    • Front: 6.00-16 4-ply (1946)
    • Rear: 12-26 6-ply (1946); 13-26 6-ply (1948); 14-26 6-ply (1951)

Variations and Options Edit

  • Optional tires
    • Front: 6.00-16 6-ply or 6.50-16 4 or 6-ply (1946)
    • Rear: 13-26 or 14-26 6-ply (1946)

Serial Numbers Information Edit

Year Serial no. run
Serial no. run
Number Built Notes
1944 OBKS6313 9495 Serial range includes W-6, WD-6, O-6, OS-6, ODS-6, I-6, ID-6
1945 9496 14152 Number built included with W-6
1946 14153 17791
1947 17792 22980
1948 22981 28703
1949 28704 33697
1950 33698 38517
1951 38518 44317
1952 44318 45273
1953 45274 45843[2]
Total built


Add details of any know examples to the list of W-6 series tractors in preservation below;

List of Preserved McCormick-Deering W-6 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
Image needed LHB

Image needed LHB

Please add any tractor with known reg or serial no. with Photo if possible.
Create a page (link) for an individual tractor by linking the reg or serial number using reg number or serial number in the relevant column. Then once saved click the red link to start the new page and add info on that tractor.

Gallery Edit

Add extra photos here please.

See also Edit

Collection related info
  • Shows and Meets - events featuring tractors and other machinery
  • Clubs Listing - List of clubs including various tractor marques
  • Collections - list of private collections with tractors (add yours)
  • Museums - includes museums featuring tractors (please add missing ones)

References / Sources Edit

  • Please supply some relevant references or sources for information for verification of data.
  1. 1.0 1.1 Wendel, C. H., 150 Years of International Harvester, Crestline Publishing, Sarasota, Florida, 1981
  2. Baumheckel, Ralph and Borghoff, Kent, International Farm Equipment Product History, American Society of Agricultural Engineers, St. Joseph, Michigan, 1997

External Links Edit

  • Add any suitable (& Relevant) web links here
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