Oliver 550

Last Updated: July 2024

Overview

The Oliver 550 is a traditional 2WD utility tractor that was manufactured by Oliver from 1958 to 1975 in Charles City, Iowa, USA. It was designed with a 72.9-inch wheelbase and an operating weight of 3,730 pounds. The tractor features a power assist steering system and a gear transmission with 6 forward and 2 reverse gears. It could be equipped with either a gasoline or diesel engine, both 2.5 L four-cylinder, with a displacement of 155 cubic inches, and at a rated 2000 RPM, it delivers 44.31 horsepower based on independent test results. The Oliver 550 includes a differential mechanical dry disc braking system, an open operator station for straightforward usability, and an independent rear PTO with speeds of 540 and 1000 rpm. The powerplant is cooled by a liquid-cooling system, and the straight inline cylinders emphasize the engine's simplicity and ease of maintenance.
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Key Specifications

Category: Utility

Power Output: 44.31

Transmission: Gear

Drive Type: 2WD

Operating Weight: 3730

Fuel Type: Gasoline, Diesel

Oliver 550 vs. Similar Tractors

Power Output
Average
Greater than 39% of similar tractors.
Operating Weight
Average
Greater than 33% of similar tractors.

Technical Specifications

Engine

Manufacturer
Oliver
Model
-
Cooling Type
Liquid-cooled
Cylinder Orientation
Inline
Valve Configuration
-
Fuel Type
Gasoline, Diesel
Induction Type
Naturally aspirated
Cylinders
4
Displacement (ci)
155
Bore (in)
3.62
Stroke (in)
3.75
Rated RPM
2000
Power Output (hp)
44.31

Transmission

Type
Gear
Forward Gears
6
Reverse Gears
2
Total Gears
-

Dimensions

Length (in)
119.9
Width (in)
-
Height (in)
58 (steering wheel), 50.1 (hood)
Operating Weight (lb)
3730

Power Take-Off (PTO)

PTO Type
Independent
PTO Speed 1 (rpm)
540
PTO Speed 2 (rpm)
1000
PTO Speed 3 (rpm)
-

Miscellaneous

Chassis
4x2
Drive Type
2WD
Steering Type
Power assist
Coolant Capacity (qts)
-
Front Tire Diameter (in)
16
Front Tire Width (in)
6
Rear Tire Diameter (in)
-
Rear Tire Width (in)
-
Front/Rear Rim Diameter (in)
-
Tire Type
Ag
Manufacture - End Year
1975
Hitch Type
I
Hitch Category
Category 1
Hitch Position
Rear
Hitch Capacity (lb)
-
Operator Station Type
Open
Starter Type
Electric
Brake Type
Differential mechanical dry disc
Hydraulic System Type
Open center

Test Results

Nebraska Tractor Test Laboratory - Test Date: May 11, 1959

Maximum Power and Fuel Consumption

  • Maximum Power: 44.31 HP (33.03 kW) at 1650 rpm
  • Fuel Consumption at Maximum Power: 3.35 Gal/hr (12.68 l/h) with a fuel efficiency of 0.55 lb/hp.hr (0.335 kg/kW.h)

Drawbar Performance

  • Power at Rated Engine Speed: 38.65 HP (28.82 kW) with a drawbar pull of 4893 lbs (21.77 kN) and a speed of 2.55 mph (4.10 km/h)
  • Fuel Consumption at Rated Speed: 0.614 lb/hp.hr (0.373 kg/kW.h) with a fuel efficiency of 12.72 Hp.hr/gal (2.51 kW.h/l)

Torque and Engine Performance

  • Maximum Torque: Not provided
  • Torque Rise: Not provided

Hydraulic Performance

  • Maximum Force Exerted: Not provided
  • Pump Delivery Rate: Not provided
  • Hydraulic Power: Not provided

Overall Efficiency

  • Fuel Efficiency at Standard PTO Speed (1000 rpm): Not provided
  • Fuel Consumption: Not provided

    Nebraska Tractor Test Lab.(1959).Test 697: Oliver 550. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/543

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