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McCormick-Deering OS-4

McCormick-Deering OS-4 tractor
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The McCormick-Deering OS-4 is a farm tractor produced from 1944 to 1953 by McCormick-Deering in Rock Island, Illinois, USA. It is an orchard tractor variant without full sheet metal. Powered by an International Harvester 2.5L 4-cylinder gasoline engine, it features a 5-speed gear transmission with 1 reverse gear. The tractor offers 25 hp drawbar power and 27.5 hp belt power. It has a rear PTO type of 540 rpm. The OS-4 is a two-wheel drive tractor with manual steering and an open operator station. Dimensions include a wheelbase of 66.75 inches, length of 120.875 inches, width of 55.5 inches, and height of 57.125 inches, with a shipping weight of 4120 lbs. Tires are sized 5.50-16 front and 12-26 rear. The tractor includes a belt pulley with a diameter of 9.75 inches and width of 7.5 inches.
McCormick-Deering OS-4tractorfarm tractorspecificationsenginetransmissionpowerdimensionsInternational Harvester
Power30 hp[B]
Founded1944 - 1953
ModelOS-4

Technical Specifications

Detailed specifications and technical data for McCormick-Deering OS-4

Power

Belt (claimed):27.5 hp (20.5 kW)
Drawbar (claimed):25 hp (18.6 kW)

Engine

Type:International Harvester 2.5L 4-cyl gasoline
Aux. fuel:0.75 gal (2.8 L)
Fuel tank:17.5 gal (66.2 L)
Rated RPM:1650
Air cleaner:oil bath
Bore/Stroke:3.375x4.45 inches (86 x 113 mm)
Compression:5.9:1 (high-compression gasoline), 4.75:1 (gasoline-distillate), 4.5:1 (kerosene)
Displacement:152.1 ci (2.5 L)
Firing order:1-3-4-2
Oil capacity:6 qts (5.7 L)
Coolant capacity:17 qts (16.1 L)

Variants

O-4:orchard
W-4:standard
OS-4:orchard, without full sheet metal

Mechanical

Drive:Two-wheel drive
Steering:Manual steering
Operator station:Open operator station

Production

Built in:Rock Island, Illinois, USA
Years made:1944 - 1953
Manufacturer:McCormick-Deering

References

Source:General Line Catalog published in 1949, by International Harvester

Belt Pulley

RPM:1019
Speed:2601 ft/min (792.78 meters/min)
Width:7.5 inches (19 cm)
Diameter:9.75 inches (24 cm)

Transmission

Type:gear
Gears:5 forward and 1 reverse
Oil capacity:24 qts (22.7 L)

Dimensions & Tires

Width:55.5 inches (140 cm)
Height:57.125 inches (145 cm)
Length:120.875 inches (307 cm)
Rear tire:12-26
Wheelbase:66.75 inches (169 cm)
Front tire:5.50-16
Rear tread:41.75 inches (106 cm)
Front tread:45.875 inches (116 cm)
Shipping weight:4120 lbs (1868 kg)
Clearance (front axle):15.125 inches (38 cm)

Power Take-off (PTO)

Rear PTO Type:540