Massey-Harris Pacemaker Specs ( 1936-1939 )
Overview
The Massey-Harris Pacemaker is a standard-tread farm tractor produced in Racine, Wisconsin, between 1936 and 1939 to replace the Wallis 12/20. It is equipped with a 4.1L 4-cylinder liquid-cooled vertical I-head gasoline engine and a four-speed gear transmission. The model features Twin Power technology, which was tested to provide up to 42.13 hp for belt-driven operations and 30.58 hp at the drawbar.
Ideal Applications
Tested Belt and Drawbar Power:
According to Nebraska Tractor Test 294, the Pacemaker produced a maximum of 42.13 hp on the belt and 30.58 hp at the drawbar, with a maximum recorded pull of 3,236 lbs.
Engine and Mechanical Configuration:
The tractor utilizes a 247.7 cubic inch Massey-Harris gasoline engine rated at 1200 RPM, paired with a four-speed gear transmission and a mechanical dry disc clutch.
Chassis and Physical Dimensions:
This 3,700-pound standard-tread tractor is built on a 78-inch wheelbase and was manufactured with both steel wheel and rubber tire options for ag applications.
Production
| Description | Standard-tread tractor / Built in Racine, Wisconsin, USA / 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. |
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| Manufacturer | Massey-Harris |
Engine
| Aux. fuel | 1.6 gal (6.1 L) |
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| Engine type | Massey-Harris 4.1L 4-cyl gasoline |
| Fuel tank | 18 gal (68.1 L) |
| Bore/Stroke | 3.875x5.25 inches (98 x 133 mm) |
| Coolant capacity | 20 qts (18.9 L) |
| Description | Massey-Harris / gasoline / 4-cylinder / liquid-cooled vertical I-head |
| Displacement | 247.7 ci (4.1 L) |
| Rated RPM | 1200 |
| Belt (claimed) | 27 hp (20.1 kW) |
| Belt (tested) | 42.13 hp (31.4 kW) |
| Drawbar (claimed) | 16 hp (11.9 kW) |
| Drawbar (tested) | 30.58 hp (22.8 kW) |
Transmission
| Clutch | mechanical dry disc |
|---|---|
| Gears | 4 forward and 1 reverse |
| Transmission type | 4-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering |
| Drive type | Two-wheel drive |
Dimensions & Tires
| Height | 53 inches (134 cm) |
|---|---|
| Length | 122 inches (309 cm) |
| Weight | 3700 lbs (1678 kg) |
| Wheelbase | 78 inches (198 cm) |
| Front tire | 28x5 |
| Rear tire | 44x10 |
| Weight | 3700 lbs (1678 kg) |
| Wheelbase | 78 inches (198 cm) |
| Ag front | 28x5 steel / 6.00x16 |
| Ag rear | 44x10 steel / 11.25x24 |
Belt Pulley
| Diameter | 12 inches (30 cm) |
|---|---|
| RPM | 832 |
| Width | 6.25 inches (15 cm) |
Nebraska Tractor Test 266
| Belt fuel use (max) | 3.1 gal/hour (11.7 l/hour) |
|---|---|
| Belt power (max) | 29.1 hp (21.7 kW) |
| Description | Gasoline 4-speed 2WDAugust 10 - 19, 1936Link: Nebraska Tractor Test 266 file / Drawbar performance / Gear 2 used for power test. / Gear 1 used for pull test. |
| Max power | 19.76 hp (14.7 kW) |
| Max pull | 2878 lbs (1305 kg) |
Nebraska Tractor Test 294
| Belt fuel use (max) | 4.2 gal/hour (15.9 l/hour) |
|---|---|
| Belt power (max) | 42.13 hp (31.4 kW) |
| Description | Gasoline Twin Power 4-speed 2WDOctober 25 - November 16, 1937Link: Nebraska Tractor Test 294 file / Drawbar performance / Gear 3 used for power test. / Gear 1 used for pull test. |
| Max power | 30.58 hp (22.8 kW) |
| Max pull | 3236 lbs (1467 kg) |
Pacemaker Serial Numbers
| Location: | On rear-left portion of tractor frame. |
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Tractor Tests
| Description | NTTL 266: gasoline 4-speed 2WD / NTTL 294: gasoline Twin Power 4-speed 2WD |
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