John Deere GP tractor specifications

1928 - 1935

1928 - 1935 Two-Cylinder Letter SeriesRow-Crop tractor

Production

Production Manufacturer:John Deere
Type:Row-Crop tractor
Factory:Waterloo, Iowa, USA
Total built:30,535 (GP)
5,103 (GPWT)
717 (GPO)
Original price:$1,200 (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

Variants GPWT:wide-tread
GPO:orchard
GP-P:potato

1929 - 1933

Two-Cylinder Letter Series

Row-Crop tractor

Production

Production
Manufacturer:	John Deere
Type:	Row-Crop tractor
Factory:	Waterloo, Iowa, USA
The John Deere GP Wide Tread (GPWT) was tricycle-front version of the model GP tractor, with a wide rear axle. There were 203 model GPWT tractors converted to a narrower, 68-inch, rear tread for use in potato fields of the US Northeast. The last 443 GPWT tractors were built with "overhead steering", with a shaft running over the top of the hood in a style similar to the later Model A tractor. The first overhead-steer GPWT was serial number was serial number 404810.

Variants

Variants
GP-P:	potato, with 68-inch tread

John Deere GPWT Power

John Deere GPWT Power
Drawbar (claimed):	10 hp 7.5 kW
Belt (claimed):	20 hp 14.9 kW
Plows:	2 (14-inch)

John Deere GPWT Engines

John Deere GPWT Engines
John Deere 5.1L 2-cyl kerosene
John Deere 5.6L 2-cyl kerosene
Fuel tank:	16 gal 60.6 L
Aux. fuel:	2 gal 7.6 L
Engine details ...

Mechanical

Mechanical
Chassis:	4x2 2WD
Steering:	manual
Cab:	Open operator station with steel pan seat.
Transmission:	3-speed unsynchronized gear
Transmission details ...

Power Take-off (PTO)

Power Take-off (PTO)
Rear RPM:	520

Dimensions & Tires

Dimensions & Tires
Wheelbase:	78.4 inches 199 cm
Front tire:	24x6
Rear tire:	44x10
Full dimensions and tires ...

GPWT Serial Numbers

GPWT Serial Numbers
Location:	Below gear shift lever
photo of GPWT serial number
1929:	400000
1930:	400936
1931:	402741
1932:	404770
1933:	405110
Final:	405254
1930:	5000 (GP-P)
Final:	5202 (GP-P)
how to read serial numbers...

Belt Pulley

Belt Pulley
Diameter:	13 inches 33 cm
Width:	6.5 inches 16 cm
RPM:	950
Speed:	3,200 ft/min 975.36 meters/min

John Deere GP Power

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
power test details ...

1928 - 1935

Two-Cylinder Letter Series

Row-Crop tractor

Nebraska Tractor Test 153

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

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

John Deere GP Engines

John Deere GP Engines John Deere 5.1L 2-cyl kerosene John Deere 5.6L 2-cyl kerosene Fuel tank:16 gal
60.6 L
Aux. fuel:2 gal
7.6 L
Engine details ...

1928 - 1935

Two-Cylinder Letter Series

Row-Crop tractor

Engines overview

Engines overview
John Deere 5.1L 2-cyl kerosene
John Deere 5.6L 2-cyl kerosene

Engine Detail

Engine Detail
John Deere
kerosene
2-cylinder
liquid-cooled
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

Engine Detail
John Deere
kerosene
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

Mechanical

Mechanical Chassis:4x2 2WD
Steering:manual
Cab:Open operator station.
Transmission:3-speed unsynchronized gear
Transmission details ...

1928 - 1935

Two-Cylinder Letter Series

Row-Crop tractor

Transmission

Transmission
Type:	unsynchronized gear
Gears:	3 forward and 1 reverse

Speeds

Speeds

Dimensions & Tires

Dimensions & Tires Weight:3,600 lbs
1632 kg
Front tire:24x6
Rear tire:42.75x10
Full dimensions and tires ...

1928 - 1935

Two-Cylinder Letter Series

Row-Crop tractor

John Deere GP Tires

John Deere GP Tires
Ag front:	24x6 steel
Ag rear:	42.75x10 steel
Ag front:	6.00x16
Ag rear:	10.00x32

Dimensions

Dimensions
Length:	112 inches 284 cm
Height:	55.5 inches 140 cm
Weight:	3,600 lbs 1632 kg

GP Serial Numbers

GP Serial Numbers Location:Below gear shift lever
photo of GP serial number
1928:200211
1929:201336
1930:212038
1931:223803
1932:228666
1933:229051
1934:229216
1935:230514
Final:230745
1931:15000 (GP-O)
1932:15226 (GP-O)
1933:15387 (GP-O)
1934:15412 (GP-O)
1935:15589 (GP-O)
Final:15732 (GP-O)
1930:5000-5202 (GP-P)

how to read serial numbers...