John Deere G GM

The John Deere G GM, produced from 1942 to 1948, symbolizes a pivotal era in agricultural history. With its robust two-cylinder engine and six-speed transmission, it exemplifies wartime innovation and resilience. Its versatility in running on various fuels underscores its adaptability amidst wartime constraints. Today, revered by collectors, its rugged design and reliability reflect the ingenuity of early tractor engineering, preserving a significant chapter in the evolution of agricultural machinery.

John Deere G GM Specifications
ModelJohn Deere G GM
Model Years1942-1948
SeriesTwo-Cylinder Letter Series
TypeRow-Crop Tractor
ManufacturerJohn Deere
FactoryWaterloo, Iowa, USA
Total Built8,764 (GM)
VariantsGM (Wartime tractor)
Engine Detail
ManufacturerJohn Deere
FuelAll fuel
Type2-cylinder, liquid-cooled
Displacement412.5 ci (6.8 L)
Bore/Stroke6.125×7.00 inches (156 x 178 mm)
Compression Ratio4.2:1
Rated RPM975
Firing Order1-2
StarterHand-crank (electric starter available)
Starter Volts12
Oil Capacity11 qts (10.4 L)
Coolant Capacity44 qts (41.6 L)
ManufacturerJohn Deere
Gears6 forward and 1 reverse
ClutchDry disc
Drawbar (claimed)20.70 hp (15.4 kW)
Belt (claimed)31.44 hp (23.4 kW)
Plows3 (14-inch)
Drawbar (tested)34.49 hp (25.7 kW)
Belt (tested)38.10 hp (28.4 kW)
Chassis4×2 2WD
CabOpen operator station
Fuel17 gal (64.3 L)
Aux. fuel1.5 gal (5.7 L)
Hydraulic system1.25 gal (4.7 L)
TypeOpen center
Capacity1.25 gal (4.7 L)
Power Take-Off (PTO)
Rear PTOTransmission
Rear RPM540 (1.75)
Charging systemGenerator
Battery Volts6
Ag Front24×5, 6.00-16
Ag Rear51.5×7, 12×38
Length137.4375 inches (349 cm)
Width65.825 inches (167 cm)
Height84.75 inches (215 cm)
Operating Weight5300 lbs (2404 kg)
Ballasted Weight7442 lbs (3375 kg)
John Deere G GM Overview

The John Deere G GM epitomizes a significant chapter in the narrative of agricultural machinery evolution, marking a crucial period during the mid-20th century when innovation intersected with the demands of wartime agriculture. Produced between 1942 and 1948, the G GM emerged as a stalwart companion to farmers navigating the complexities of agricultural production amidst the backdrop of global conflict. Its design, characterized by a robust two-cylinder engine and a six-speed gear transmission, epitomized the pinnacle of tractor technology of its time. With a claimed drawbar horsepower of 20.70, the G GM stood as a symbol of power and reliability, capable of tackling the diverse challenges of farm work with aplomb.
In the midst of wartime constraints, the G GM’s ability to operate on various fuel types underscored its adaptability and resilience, enabling farmers to overcome the logistical hurdles presented by fuel shortages. This versatility, coupled with its sturdy construction and dependable performance, positioned the G GM as an indispensable asset on the agricultural frontlines, supporting food production efforts during a period of unprecedented global turmoil.

Beyond its functional prowess, the G GM holds a revered status among collectors and enthusiasts today, cherished for its historical significance and enduring legacy in the annals of agricultural machinery. Its rugged design, characterized by manual steering and an open operator station, serves as a poignant reminder of the simplicity and durability that defined tractor technology of the era. Each component, meticulously crafted to withstand the rigors of farm life, speaks to the craftsmanship and ingenuity of its creators.

As collectors seek to preserve and celebrate the heritage of agricultural machinery, the John Deere G GM emerges as a prized possession, revered for its role in shaping the agricultural landscape of its time. Its place in the pantheon of agricultural history is secure, serving as a poignant reminder of the resilience and innovation that have defined the farming community throughout the ages. In the hands of collectors and enthusiasts, the G GM continues to inspire admiration and reverence, standing as a testament to the enduring spirit of the farming tradition.