Oliver 1550

Last Updated: July 2024

Overview

The Oliver 1550 is a 2WD row-crop tractor, built by Oliver in Charles City, Iowa, USA, from 1965 to 1969. This model features a 3.8 L, six-cylinder diesel, gasoline, or LP-gas engine, and two transmission options: a Hydra-Power partial power shift with 12 forward and 4 reverse gears, or an unsynchronized gear with 6 forward and 2 reverse gears. Key specifications include a 232 cubic inch engine displacement, 53 horsepower output for diesel/gasoline variants, and 51 for the LP-gas variant, both at a rated RPM of 2200. Equipped with power assist steering, disc brakes, and an open operator station, the 1550 offers versatility with PTO speeds of 540, 1000, and 540/1000 rpm. The Oliver 1550 has dimensions of 154.3 inches in length, 81.5 inches in width, and 97.2 inches in height, with an operating weight of 7000 lbs. Additional details from the Nebraska Tractor Test Laboratory (Test 944, January 1966) include a maximum torque of 234 lb-ft at 1350 rpm, 23.8% torque rise, maximum force exerted of 2180 lbs at hitch points, and a pump delivery rate of 9.2 GPM at minimum pressure and rated engine speed.

Key Specifications

Category: Row Crop

Power Output: 53.0 (diesel/gasoline), 51.0 (LP-gas)

Transmission: Partial power shift and unsynchronized gear

Drive Type: 2WD

Operating Weight: 7000

Fuel Type: Diesel, Gasoline, LP-gas

Oliver 1550 vs. Similar Tractors

Operating Weight

Below Average

Greater than 25% of similar tractors.

Technical Specifications

Engine

Manufacturer: -
Model: -
Cooling Type: Liquid
Cylinder Orientation: Inline
Valve Configuration: -
Fuel Type: Diesel, Gasoline, LP-gas
Induction Type: Natural aspirated
Cylinders: 6
Displacement (ci): 232
Bore (in): 3.625
Stroke (in): 3.75
Rated RPM: 2200
Power Output (hp): 53.0 (diesel/gasoline), 51.0 (LP-gas)

Transmission

Type: Partial power shift and unsynchronized gear
Forward Gears: 12 (partial power shift), 6 (unsynchronized gear)
Reverse Gears: 4 (partial power shift), 2 (unsynchronized gear)
Total Gears: 16 (partial power shift), 8 (unsynchronized gear)

Dimensions

Length (in): 154.3
Width (in): 81.5
Height (in): 97.2
Operating Weight (lb): 7000

Power Take-Off (PTO)

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

Miscellaneous

Chassis: 4x2 2WD
Drive Type: 2WD
Steering Type: Power assist
Coolant Capacity (qts): 20
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): -
Tire Type: Ag
Manufacture - End Year: 1969
Hitch Type: -
Hitch Category: II/I
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: Open
Starter Type: Electric
Brake Type: Disc
Hydraulic System Type: -

Test Results

Nebraska Tractor Test Laboratory - Test Date: January 1966

Maximum Power and Fuel Consumption

Maximum Power: 54.70 HP (40.80 kW) at 1650 rpm
Fuel Consumption at Maximum Power: 4.12 Gal/hr (15.60 l/h) with a fuel efficiency of 0.545 lb/hp.hr (0.331 kg/kW.h)

Drawbar Performance

Power at Rated Engine Speed (4th Gear): 45.76 HP (34.14 kW) with a drawbar pull of 4998 lbs (22.23 kN) and a speed of 3.82 mph (6.15 km/h)
Fuel Consumption at Rated Speed: 0.585 lb/hp.hr (0.356 kg/kW.h) with a fuel efficiency of 13.87 Hp.hr/gal (2.73 kW.h/l)

Torque and Engine Performance

Maximum Torque: 234 lb.-ft. (317 Nm) at 1350 rpm
Torque Rise: 23.8% with a power increase at 1600 rpm of 12.6%

Hydraulic Performance

Maximum Force Exerted: 2180 lbs (9.7 kN) at hitch points
Pump Delivery Rate: 9.2 GPM (35 l/min) at minimum pressure and rated engine speed

NTTL.(1966).Nebraska Tractor Test 944 for Oliver 1550 Diesel. Lincoln, NE:Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/565