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Massey-Harris Pacemaker

Massey-Harris Pacemaker tractor
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The Massey-Harris Pacemaker was produced from 1936 to 1939 as a standard-tread tractor built in Racine, Wisconsin, USA. It replaced the Wallis 12/20 in Massey's line and featured the Twin Power option which increased engine RPMs to provide additional horsepower for belt work. The Pacemaker was a wide front tractor, while the Challenger was the row-crop version. It was powered by a 4.1L 4-cylinder gasoline engine with a liquid-cooled vertical I-head design. The tractor had a 4-speed gear transmission with mechanical dry disc clutch, two-wheel drive, and manual steering. It had an open operator station and was equipped with steel tires sized 28x5 front and 44x10 rear, with additional tire options. The tractor's belt pulley was 12 inches in diameter and 6.25 inches wide, running at 832 RPM. The Pacemaker was known for its claimed drawbar power of 16 hp and belt power of 27 hp, with tested values significantly higher.
Massey-Harris Pacemakertractorspecificationsenginetransmissionpowerdimensionstires19361939
Power30 hp[B]
Founded1936 - 1939
ModelPacemaker

Technical Specifications

Detailed specifications and technical data for Massey-Harris Pacemaker

Power

Belt (tested):42.13 hp (31.4 kW)
Belt (claimed):27 hp (20.1 kW)
Drawbar (tested):30.58 hp (22.8 kW)
Drawbar (claimed):16 hp (11.9 kW)

Tires

Rear tire:44x10 steel
Front tire:28x5 steel
Additional rear tire:11.25x24
Additional front tire:6.00x16

Engine

Type:Massey-Harris 4.1L 4-cyl gasoline
Cooling:liquid-cooled vertical I-head
Aux. fuel:1.6 gal (6.1 L)
Fuel tank:18 gal (68.1 L)
Rated RPM:1200, 1400 (Twin Power option)
Bore/Stroke:3.875x5.25 inches (98 x 133 mm)
Displacement:247.7 ci (4.1 L)
Coolant capacity:20 qts (18.9 L)

Dimensions

Height:53 inches (134 cm)
Length:122 inches (309 cm)
Weight:3700 lbs (1678 kg)
Wheelbase:78 inches (198 cm)

Mechanical

Drive:Two-wheel drive
Steering:Manual steering
Operator station:Open operator station

Production

Type:Standard-tread tractor
Notes:The Massey-Harris Pacemaker replaced the Wallis 12/20 in Massey's line. The Twin Power feature increased engine rpms to provide additional horsepower for belt work. The Pacemaker was a standard (wide) front tractor, while the Challenger was the row-crop version.
Built in:Racine, Wisconsin, USA
Manufacturer:Massey-Harris
Years produced:1936 - 1939

Belt Pulley

RPM:832
Width:6.25 inches (15 cm)
Diameter:12 inches (30 cm)

Transmission

Type:gear
Gears:4 forward and 1 reverse
Clutch:mechanical dry disc

Serial Numbers

Location:On rear-left portion of tractor frame.