Massey-Harris GP 15/22

The Massey-Harris GP 15/22 is a tractor produced by Massey Harris. It is equipped with a 226 ci 3.7 L engine. The rated power output is 22.50 hp 16.8 kW. Transmission: 3 forward and 1 reverse. Drive type: 4x4 4WD. Operating weight: 3,900 lbs 1769 kg.

Overview

	1930 - 1936 Four-wheel Drive (4WD) tractor
1930 - 1936
Four-wheel Drive (4WD) tractor

Production
Manufacturer	Massey-Harris
Four-wheel Drive (4WD) tractor
Built in Racine, Wisconsin, USA
Total built	3,000
Original price	$1,000
The Massey-Harris 15/22 GP General Purpose tractor was the first Massey-Harris designed tractor.

Massey-Harris GP Engine
Hercules 3.7L 4-cyl gasoline
Fuel tank	14 gal 53.0 L
Aux. fuel	1.6 gal 6.1 L
Engine details ...

Massey-Harris GP Transmission
3-speed gear
Transmission details ...

Massey-Harris GP Power
Drawbar (claimed)	15 hp 11.2 kW
Belt (claimed)	22 hp 16.4 kW
Plows	2 (14-inch)
Drawbar (tested)	19.91 hp 14.8 kW
Belt (tested)	24.84 hp 18.5 kW
Performance test details ...

Mechanical
Drive	4x4 4WD
Open operator station.

Dimensions & Tires
Weight	3,900 lbs 1769 kg
Front tire	38x8
Rear tire	38x8
Full dimensions and tires ...

Belt Pulley
Diameter	12.125 inches 30 cm
Width	6.5 inches 16 cm
RPM	802
Speed	2.546 ft/min 0.78 meters/min

Engine

Engine Detail — 226 ci / 3.7 L Gasoline

Manufacturer	Hercules OOC
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled vertical L-head
Displacement	226 ci 3.7 L
Bore/Stroke	4.00x4.50 inches 102 x 114 mm
Air cleaner	oil bath
Rated RPM	1200
Coolant capacity	16 qts 15.1 L

Engine Detail — 226 ci / 3.7 L Gasoline

Manufacturer	Hercules OHC
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled, The overhead-valve (OHV) Hercules engine replaced the flathead OOC in 1936, the final year of the GP production.
Displacement	226 ci 3.7 L
Bore/Stroke	4.00x4.50 inches 102 x 114 mm
Rated RPM	1200

Transmission

Transmission — 3 forward and 1 reverse gear

Type	gear
Gears	3 forward and 1 reverse

Dimensions

Massey-Harris GP Tires
Ag front	38x8 steel
Ag rear	38x8 steel

Dimensions
Length	119 inches 302 cm
Height	55 inches 139 cm
Weight	3,900 lbs 1769 kg
Ground clearance	30 inches 76 cm
Front tread	40 to inches 101 to 0 cm
Front tread	60 to inches 152 to 0 cm
Front tread	66 to inches 167 to 0 cm
Front tread	76 to inches 193 to 0 cm
Rear tread	40 to inches 101 to 0 cm
Rear tread	60 to inches 152 to 0 cm
Rear tread	66 to inches 167 to 0 cm
Rear tread	76 to inches 193 to 0 cm

Tests

Tractor Tests
NTTL 177: gasoline 3-speed 4WD
NTTL 191: distillate 3-speed 4WD

Nebraska Tractor Test 177
Gasoline 3-speed 4WD May 5 - 27, 1930 Link: Nebraska Tractor Test 177 file
Belt power (max)	24.84 hp 18.5 kW
Belt fuel use (max)	3.0 gal/hour 11.4 l/hour
Drawbar performance
Max power	19.91 hp 14.8 kW
Gear 1 used for power test.
Max pull	3,247 lbs 1472 kg
Gear 1 used for pull test.

Nebraska Tractor Test 191
Distillate 3-speed 4WD May 22 - June 12, 1931 Link: Nebraska Tractor Test 191 file
Belt power (max)	22.50 hp 16.8 kW
Belt fuel use (max)	2.9 gal/hour 11.0 l/hour
Drawbar performance
Max power	16.79 hp 12.5 kW
Gear 2 used for power test.
Max pull	2,764 lbs 1253 kg
Gear 1 used for pull test.

Photos

Massey-Harris GP 15/22

Massey-Harris GP 15/22

Massey-Harris GP 15/22

Massey-Harris GP 15/22

Massey Harris GP number 303001 at the Taihape Museum in New Zealand.