Oliver 550

The Oliver 550 was a versatile utility tractor produced in Charles City, Iowa, USA. It had a significant production run and was available with both gasoline and diesel engine options. The tractor featured a two-wheel drive configuration and offered power-assisted steering for ease of operation. With its mechanical contracting band brakes and an open operator station, the Oliver 550 was a reliable workhorse on farms during its time. It had a capacity of 13 gallons for fuel and 2.5 gallons for its hydraulic system. The tractor was known for its drawbar and PTO power, making it suitable for various agricultural tasks. It remains a piece of agricultural history appreciated by collectors today.

Oliver 550 Specs
ManufacturerOliver
TypeUtility tractor
Production LocationCharles City, Iowa, USA
Total Built20,368 (Oliver) and 3,915 (Cockshutt)
Original Price (in 1975)$4,400
First-Year EngineEquipped with the same 2.4L engine as the Super 55
Power
Drawbar Power (Claimed)35.3 hp (26.3 kW)
PTO Power (Claimed)41.39 hp (30.9 kW)
Drawbar Power (Tested)35.36 hp (26.4 kW)
PTO Power (Tested)41.39 hp (30.9 kW)
Engine Details (Gasoline)
Displacement155 cubic inches (2.5 L)
Bore/Stroke3.62×3.75 inches (92 x 95 mm)
Air CleanerOil bath
Compression Ratio7.75:1
Rated RPM2000
Starter Voltage12 volts
Oil Capacity4 quarts (3.8 L)
Engine Details (Diesel)
Displacement155 cubic inches (2.5 L)
Bore/Stroke3.625×3.75 inches (92 x 95 mm)
Air CleanerOil bath
Compression Ratio16:1
Rated RPM2000
Starter Voltage12 volts
Transmission
TypeGear
Gears6 forward and 2 reverse
ClutchDry disc
Oil Capacity20 quarts (18.9 L)
Mechanical Details
Drive ConfigurationTwo-wheel drive (2WD)
SteeringPower assist
BrakesMechanical contracting band
Operator StationOpen
Capacity
Fuel Tank Capacity13 gallons (49.2 L)
Hydraulic System Capacity2.5 gallons (9.5 L)
Hydraulics
TypeOpen center
Hydraulic Capacity2.5 gallons (9.5 L)
Pump Flow5.25 gallons per minute (19.9 liters per minute)
Tractor Hitch
Rear TypeI
Rear PTOIndependent
Rear RPM540/1000
GroundPositive
Ground: Positive
Batteries1 (gasoline)
Battery Voltage12 volts
Electrical (Diesel)
GroundPositive
Batteries2 (diesel)
Battery Voltage6 volts (diesel) and 12 volts (gasoline)
Tires
Front Tires6.00-16
Rear Tires12-26
Dimensions
Wheelbase72.9 inches (185 cm)
Length119.9 inches (304 cm)
Height (Steering Wheel)58 inches (147 cm)
Height (Hood)50.1 inches (127 cm)
Front Tread WidthAdjustable from 48 to 76 inches (121 to 193 cm)
Rear Tread WidthAdjustable from 48 to 76 inches (121 to 193 cm)
Weight
Gas Shipping Weight3,070 lbs (1392 kg)
Diesel Shipping Weight3,170 lbs (1437 kg)
Operating Weight3,730 lbs (1691 kg)
Nebraska Tractor Tests
Gasoline Test(NTTL 697) and Diesel Test (NTTL 698) conducted in 1959, including power and fuel use data for PTO and drawbar performance.
Oliver 550 Overview

The Oliver 550, a historical tractor model, represents a significant piece of agricultural history. Manufactured in the mid-20th century in Charles City, Iowa, USA, this versatile utility tractor was a staple on farms during its production years. It boasted two engine options, a 2.5L 4-cylinder gasoline engine and a 2.5L 4-cylinder diesel engine, reflecting the technology available at the time. These engines, while not exceptionally powerful by today’s standards, were reliable workhorses of their era.

The Oliver 550 featured a two-wheel drive configuration with power-assisted steering, a feature that improved maneuverability and made it easier for farmers to operate. Its mechanical contracting band brakes provided effective stopping power for the time, and the open operator station allowed the driver to have a clear view of the field.

With its drawbar and PTO power, the Oliver 550 could handle a variety of tasks on the farm, from plowing and planting to powering machinery. It had a capacity of 13 gallons for fuel and 2.5 gallons for its hydraulic system, suitable for its intended applications.

Today, the Oliver 550 holds a special place in the hearts of collectors and enthusiasts of vintage tractors. Its historical significance, reliable performance, and the nostalgia it evokes make it a sought-after collector’s model. Restored Oliver 550 tractors are often showcased at agricultural shows and events, allowing people to appreciate the technological advancements and the role this tractor played in shaping agriculture during its time.

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