All 54 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production
Manufacturer
John Deere
(no label)
Row-Crop tractor
(no label)
Built in Waterloo, Iowa, USA
Total built
30,535 (GP)
Total built
5,103 (GPWT)
Total built
717 (GPO)
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Original price was $1,200 in 1935
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The GP was originally designated the Model C, the name was changed due to a similarity to the existing D, plus the "General Purpose" name was a marketing ploy to keep in line with International's new "Farmall". The GP was designed as a row crop tractor, with the fixed front axle straddling three rows. Several versions of the GP were made. The "wide tread" GPWT has a 76-inch rear axle and a tricycle front. The GP-P was a modified GPWT with a 68-inch rear axle, for use in potato fields. The GPO was lowered and had fenders for orchard work. Twenty-four GPO tractors were converted into crawlers by Lindeman.
Engine
(no label)
John Deere 5.1L 2-cyl kerosene
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John Deere 5.6L 2-cyl kerosene
Fuel tank
16 gal | 60.6 L
Aux. fuel
2 gal | 7.6 L
Transmission
(no label)
3-speed unsynchronized gear
Power
Drawbar (claimed)
10 hp | 7.5 kW
Belt (claimed)
20 hp | 14.9 kW
Plows
2 (14-inch)
Drawbar (tested)
18.86 hp | 14.1 kW
Belt (tested)
25.36 hp | 18.9 kW
Mechanical
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Two-wheel drive
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Manual steering
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Open operator station.
Dimensions
Weight
3,600 lbs | 1632 kg
Front tire
24x6
Rear tire
42.75x10
Serial location
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Below gear shift lever
Engine
Engine options
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John Deere 5.1L 2-cyl kerosene
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John Deere 5.6L 2-cyl kerosene
Engine detail
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John Deere
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kerosene
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2-cylinder
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liquid-cooled inline
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Original engine, used until 1931. Water-injection system was used to prevent detonation ("knocking") with low quality fuels.
Displacement
311.6 ci | 5.1 L
Bore/Stroke
5.75x6.00 inches | 146 x 152 mm
Rated RPM
900
Coolant capacity (Coolant)
36 qts | 34.1 L
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John Deere
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kerosene
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2-cylinder
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liquid-cooled
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The new engine was introuded in 1931 on GP serial number 224100. It had lower compression but with a quarter-inch larger bore, producing slightly more power with better fuel economy. The lower compression eliminated the pre-ignition problem when using low-quality fuel, so the water-injection system was eliminated.