John Deere GP

Last Updated: July 2024

Overview

The John Deere GP was a two-cylinder tractor powered by a distillate fuel engine with a bore and stroke of 6 inches. It featured a naturally aspirated induction system and a Schebler DLTX5 carburetor. The unsynchronized gear transmission offered three forward gears and one reverse, with advertised speeds ranging from 2.25 mph (low) to 4.125 mph (high). Independent testing revealed a maximum power output of 24.22 hp at 950 rpm, higher than the initially specified 22 hp. The tractor had steel wheels, with a 24-inch front rim diameter and a 44-inch rear rim diameter with a 6-inch wide rim extension. It was equipped with a Donaldson centrifugal and oiled fiber air cleaner. The operating weight, including the operator, was 4,925 lbs.

Key Specifications

Power Output: 24.22

Transmission: Unsynchronized gear

Operating Weight: 4,925

Fuel Type: Distillate

Technical Specifications

Engine

Manufacturer: -
Model: -
Cooling Type: -
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: Distillate
Induction Type: Naturally Aspirated
Cylinders: 2
Displacement (ci): 339.3
Bore (in): 6
Stroke (in): 6
Rated RPM: 950
Power Output (hp): 24.22

Transmission

Type: Unsynchronized gear
Forward Gears: 3
Reverse Gears: 1
Total Gears: -

Dimensions

Length (in): 112
Width (in): -
Height (in): 55.5
Operating Weight (lb): 4,925

Power Take-Off (PTO)

PTO Type: -
PTO Speed 1 (rpm): -
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: -
Drive Type: -
Steering Type: Manual
Coolant Capacity (qts): 36
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): 24 (front, using "24x6), 42.75 (rear, using "42.75x10") (assumed reason for two tire sizes: possibly front and rear)
Tire Type: Steel
Manufacture - End Year: -
Hitch Type: -
Hitch Category: Category 3
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: -
Starter Type: -
Brake Type: -
Hydraulic System Type: -

Test Results

Nebraska Tractor Test Laboratory - Test Date: May 4 to May 15, 1931

Maximum Power and Fuel Consumption

Maximum Power (Belt): 24.22 HP at 954 rpm
Fuel Consumption at Maximum Power: 2.57 Gal/hr with a fuel efficiency of 0.735 lb/hp.hr
Cooling System Temperature: 207°F

Drawbar Performance

Power at Rated Load (Intermediate Gear): 15.34 HP with a drawbar pull of 1702 lbs and a speed of 3.38 mph
Fuel Consumption at Rated Load: 6.32 gal/hr with a fuel efficiency of 0.264 lb/hp.hr
Slip of Drive Wheels at Rated Load: 2.23%

Torque and Engine Performance

Rated Engine Speed: 950 rpm
Engine Specifications: Bore and stroke of 6x6 inches, Carburetor: Schebler Model DLTX5

Hydraulic Performance

N/A for this model

Overall Efficiency

Fuel Type: Distillate
Total Weight As Tested (with operator): 4925 lbs

Nebraska Tractor Test Lab. "Test 190: John Deere GP" (1931). Nebraska Tractor Tests. 42. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/42