John Deere GP

Row-Crop tractor

Built in Waterloo, Iowa, USA

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.

3-speed unsynchronized gear

Two-wheel drive

Manual steering

Open operator station.

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.

John Deere 5.1L 2-cyl kerosene

John Deere 5.6L 2-cyl kerosene

Original engine, used until 1931. Water-injection system was used to prevent detonation ("knocking") with low quality fuels.

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.

NTTL 153: 311 kerosene 3-speed 2WD

NTTL 190: 339 distillate 3-speed 2WD

311 kerosene 3-speed 2WD October 22 - 29, 1928 Link: Nebraska Tractor Test 153 file

Drawbar performance

339 distillate 3-speed 2WD May 4 - 15, 1931 Link: Nebraska Tractor Test 190 file

Drawbar performance