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Tractor · 1928Unverified

John Deere GP

John Deere GP — Two-Cylinder Letter Series · 10 hp. Reference specifications; pending source verification.

The John Deere GP is a compact tractor, rated at 10 hp, making it a smaller option within its class. Manufactured from 1928 to 1935, the GP is powered by a 2-cylinder liquid-cooled engine, which drives through a 3-speed gearbox and two-wheel drive. The tractor weighs 1632 kg and is suited to handling plots of around 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power
10 hp
Max power
12.9 kW
Weight
1632 kg

Catalogue coverage

Variants represented
2
Richest spec table
79 rows
Recorded power
10 hp
Recorded weight
1632 kg
Transmissions
3-speed unsynchronized gear
Production years
1928-1935
Verified variants
0

1 linked source document displayed

Hover a source tag to verify

Overview

ManufacturerJohn DeereReference
Row-Crop tractorReference
Built in Waterloo, Iowa, USAReference
Total built30,535 (GP)Reference
Total built5,103 (GPWT)Reference
Total built717 (GPO)Reference
Original price was $1,200 in 1935Reference
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.Reference
Two-wheel driveReference
Manual steeringReference
Open operator station.Reference

Variants

GPWTwide-treadReference
GPOorchardReference
GP-PpotatoReference

Engine

John Deere 5.1L 2-cyl keroseneReference
John Deere 5.6L 2-cyl keroseneReference
Fuel tank60.6 LReference
Aux. fuel7.6 LReference
Drawbar (claimed)7.5 kWReference
Belt (claimed)14.9 kWReference
Plows2 (14-inch)Reference
Drawbar (tested)14.1 kWReference
Belt (tested)18.9 kWReference
John DeereReference
keroseneReference
2-cylinderReference
liquid-cooled inlineReference
Original engine, used until 1931. Water-injection system was used to prevent detonation ("knocking") with low quality fuels.Reference
Displacement5.1 LReference
Bore/Stroke146 x 152 mmReference
Rated RPM900Reference
Coolant capacity34.1 LReference
liquid-cooledReference
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.Reference
Displacement5.6 LReference
Bore/Stroke152 x 152 mmReference
Rated RPM950Reference
Belt power (max)18.6 kWReference
Max power12.9 kWReference
Belt power (max)18.9 kWReference
Max power14.1 kWReference

Transmission

3-speed unsynchronized gearReference
Typeunsynchronized gearReference
Gears3 forward and 1 reverseReference

Dimensions

Weight1632 kgReference
Front tire24x6Reference
Rear tire42.75x10Reference
Ag front24x6 steelReference
Ag rear42.75x10 steelReference
Ag front6.00x16Reference
Ag rear10.00x32Reference
Length284 cmReference
Height140 cmReference

GP Serial Number Location

Below gear shift leverReference

GP Serial Numbers

1928200211Reference
1929201336Reference
1930212038Reference
1931223803Reference
1932228666Reference
1933229051Reference
1934229216Reference
1935230514Reference
Final230745Reference
193115000 (GP-O)Reference
193215226 (GP-O)Reference
193315387 (GP-O)Reference
193415412 (GP-O)Reference
193515589 (GP-O)Reference
Final15732 (GP-O)Reference
19305000-5202 (GP-P)Reference
FAQ: How to read a serial number table.Reference

Test results

NTTL 153: 311 kerosene 3-speed 2WDReference
NTTL 190: 339 distillate 3-speed 2WDReference
311 kerosene 3-speed 2WDOctober 22 - 29, 1928Link: Nebraska Tractor Test 153 fileReference
Belt fuel use (max)10.2 l/hourReference
Drawbar performanceReference
Max pull1129 kgReference
339 distillate 3-speed 2WDMay 4 - 15, 1931Link: Nebraska Tractor Test 190 fileReference
Max pull1294 kgReference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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