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John Deere GP

The John Deere GP is a tractor produced by John Deere. It is equipped with a 339.3 ci 5.6 L engine. The rated power output is 25.36 hp 18.9 kW. Transmission: 3 forward and 1 reverse. Operating weight: 3,600 lbs 1632 kg.

Engine Power
25.36 hp 18.9 kW
Fuel & Capacities
Kerosene
Transmission
3 forward and 1 reverse
Operating Weight
3,600 lbs 1632 kg

John Deere GP Serial Number & Year Decoder

Find the exact manufacture year of your tractor by checking your chassis serial number below.

Where to Find the Serial NumberThe serial number plate is commonly located on the front frame, tractor transmission housing (right side), or instrument panel badge.

Overview

John Deere GP tractor photo
1928 - 1935 Two-Cylinder Letter SeriesRow-Crop tractor
1928 - 1935
Two-Cylinder Letter Series
Row-Crop tractor
Production
Manufacturer
John Deere
Row-Crop tractor
Built in Waterloo, Iowa, USA
Total built
30,535 (GP)
5,103 (GPWT)
717 (GPO)
Original price was $1,200 in 1935
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.
Variants
GPWT
wide-tread
GPO
orchard
GP-P
potato
John Deere GP Transmission
3-speed unsynchronized gear
Transmission details ...
John Deere GP 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
Performance test details ...
Mechanical
Two-wheel drive
Manual steering
Open operator station.
Dimensions & Tires
Weight
3,600 lbs 1632 kg
Front tire
24x6
Rear tire
42.75x10
Full dimensions and tires ...
References
GP references literature
Tractors 1918-1976 published by John Deere*
Quality Equipment for Your Farming Operations published in 1929, by John Deere
General Purpose Tractor published in 1930, by John Deere
General Purpose Two-Cylinder Tractor published in 1931, by John Deere
*Publication contains known errors.

Engine

Engine options
John Deere 5.1L 2-cyl kerosene
John Deere 5.6L 2-cyl kerosene

Engine Detail — 311.6 ci / 5.1 L Kerosene

Manufacturer
John Deere
Fuel Type
Kerosene
Configuration
2-cylinder, liquid-cooled inline
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
36 qts 34.1 L

Engine Detail — 339.3 ci / 5.6 L Kerosene

Manufacturer
John Deere
Fuel Type
Kerosene
Configuration
2-cylinder, liquid-cooled
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.
Displacement
339.3 ci 5.6 L
Bore/Stroke
6.00x6.00 inches 152 x 152 mm
Rated RPM
950
Coolant capacity
36 qts 34.1 L

Transmission

Transmission — 3 forward and 1 reverse unsynchronized gear

Type
unsynchronized gear
Gears
3 forward and 1 reverse
GP unsynchronized gear speeds

Dimensions

John Deere GP Tires
Ag front
24x6 steel
Ag rear
42.75x10 steel
Ag front
6.00x16
Ag rear
10.00x32
Dimensions
Length
112 inches 284 cm
Height
55.5 inches 140 cm
Weight
3,600 lbs 1632 kg

Tests

Tractor Tests
NTTL 153: 311 kerosene 3-speed 2WD
NTTL 190: 339 distillate 3-speed 2WD
Nebraska Tractor Test 153
311 kerosene 3-speed 2WD October 22 - 29, 1928 Link: Nebraska Tractor Test 153 file
Belt power (max)
24.97 hp 18.6 kW
Belt fuel use (max)
2.7 gal/hour 10.2 l/hour
Drawbar performance
Max power
17.24 hp 12.9 kW
Max pull
2,489 lbs 1129 kg
Nebraska Tractor Test 190
339 distillate 3-speed 2WD May 4 - 15, 1931 Link: Nebraska Tractor Test 190 file
Belt power (max)
25.36 hp 18.9 kW
Belt fuel use (max)
2.7 gal/hour 10.2 l/hour
Drawbar performance
Max power
18.86 hp 14.1 kW
Max pull
2,853 lbs 1294 kg

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