Gray Tractor 18-36

The Gray Tractor 18-36 is a tractor produced by Gray Tractor. It is equipped with a 478 ci 7.8 L engine. Transmission: 2 forward and 1 reverse. Drive type: 3x1 drum drive. Operating weight: 6200 lbs 2812 kg.

Overview

	1918 - 1921 Standard-tread tractor

Production
Manufacturer	Gray Tractor
Standard-tread tractor
Built in Minneapolis, Minnesota, USA

Gray Tractor 18-36 Engine
Waukesha 7.8L 4-cyl gasoline
Engine details ...

Gray Tractor 18-36 Transmission
2-speed gear
Transmission details ...

Gray Tractor 18-36 Power
Drawbar (claimed)	18 hp 13.4 kW
Belt (claimed)	36 hp 26.8 kW
Plows	4
Drawbar (tested)	19.64 hp 14.6 kW
Belt (tested)	32.20 hp 24.0 kW
Performance test details ...

Mechanical
Drive	3x1 drum drive
Manual steering
Open operator station.

Dimensions & Tires
Wheelbase	104.5 inches 265 cm
Weight	6200 lbs 2812 kg
Front tire	40x8
Rear tire	54x54
Full dimensions and tires ...

Belt Pulley
Diameter	11 inches 27 cm
Width	8 inches 20 cm

References
The Gray Tractor with the Wide Drive Drum published in 1919

Engine

Engine Detail — 478 ci / 7.8 L Gasoline

Manufacturer	Waukesha
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled inline
Displacement	478 ci 7.8 L
Bore/Stroke	4.75x6.75 inches 121 x 171 mm

Transmission

Transmission — 2 forward and 1 reverse gear

Type	gear
Gears	2 forward and 1 reverse

Dimensions

Gray Tractor 18-36 Tires
Ag front	40x8 steel
Ag rear	54x54 steel

Dimensions
Wheelbase	104.5 inches 265 cm
Length	174 inches 441 cm
Width	72.25 inches 183 cm
Height	72 inches 182 cm
Weight	6200 lbs 2812 kg

Tests

Nebraska Tractor Test 22
Gasoline 2-speed 2WD June 11 - July 3, 1920 Link: Nebraska Tractor Test 22 file
Belt power (max)	32.20 hp 24.0 kW
Drawbar performance
Max power	19.64 hp 14.6 kW
Max pull	3390 lbs 1537 kg

Photos

Gray Tractor 18-36 tractor photo