Production years
1946-1955
Massey Harris tractor ยท 1946-1955
Massey Harris 55 Tractor
The Massey Harris 55 is a heavy standard-tread field tractor built from 1946 to 1955, with up to 56 PTO horsepower claimed in gasoline form. Its large Continental four-cylinder engine and substantial weight made it a serious five-plow tractor for its day.
Engine
Continental 6.3L, 4-cylinder gasoline, diesel, all-fuel, or LP gas
Power
56 PTO hp claimed; 57.55 drawbar hp tested
Weight
About 7,223-7,571 lb
Massey Harris 55 specifications
| Production years | 1946-1955 |
|---|---|
| Engine | Continental 6.3L, 4-cylinder gasoline, diesel, all-fuel, or LP gas |
| Power | 56 PTO hp claimed; 57.55 drawbar hp tested |
| Transmission | 4-speed gear |
| Weight | About 7,223-7,571 lb |
| Fuel type | Gasoline, diesel, all-fuel, or LP gas |
| PTO | 540 rpm rear PTO |
| Hydraulics | 10 gpm total flow |
What the 55 is used for
The 55 was built for open-field work, including plowing, disking, heavy drawbar work, and belt-powered equipment. Its standard-tread layout and mass favored traction and sustained field work over close row-crop cultivation.
Why the Massey Harris 55 stands out
The Model 55 is one of the best-known large Massey Harris tractors. Its imposing design, strong pulling reputation, and multiple fuel versions make it particularly appealing to collectors and antique-pulling enthusiasts.
Buying a used Massey Harris 55
Identify the fuel version before buying, then inspect the engine for cracks, cooling problems, oil-pressure issues, and evidence of poor fuel-system maintenance. Test the clutch, four-speed transmission, PTO, brakes, steering, and final drives, and look for damaged castings or missing model-specific sheet metal.
Massey Harris 55 frequently asked questions
How much horsepower does a Massey Harris 55 have?
The gasoline version was claimed at 56 PTO horsepower, while a commonly cited Nebraska test recorded 57.55 drawbar horsepower.
What years was the Massey Harris 55 made?
It was produced from 1946 through 1955.
Are parts available for a Massey Harris 55?
Many service and engine parts remain available through vintage-tractor suppliers, but complete, correct cosmetic and fuel-system parts may require more searching.
Specifications are commonly cited figures for general reference; exact figures vary by year and serial number, so confirm against TractorData.com and the machine's records. Values and prices of used tractors vary by condition and region. Page updated Aug 4, 2026.