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Tractor · 1958Unverified

Oliver 990

Name: Oliver 990
Brand: Oliver

Oliver 990 — 900 Series · 84 hp. Reference specifications; pending source verification.

The Oliver 990 is a tractor with a rated output of 84 hp, placing it in the middle of its class in terms of power. Produced between 1958 and 1961, this model features a 3-cylinder diesel liquid-cooled engine and a 6-speed gearbox, driving through two-wheel drive. The listed weight of the Oliver 990 is 4989 kg, suitable for tasks involving around 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

84 hp

Max power

45.8 kW

Weight

4989 kg

Catalogue coverage

Variants represented

Richest spec table

62 rows

Recorded power

84 hp

Recorded weight

4989 kg

Transmissions

6-speed gear

Production years

1958-1961

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerOliverReference

Standard-tread tractorReference

Built in Charles City, Iowa, USAReference

Original price was $8,200 in 1961Reference

The Oliver 990 was also sold as the Massey Ferguson 98 (with different sheet metal, paint, and seat).Reference

Two-wheel driveReference

SteeringpowerReference

Disc brakesReference

Open operator station.Reference

Variants

990gear driveReference

995torque converterReference

Engine

General Motors 3.5L 3-cyl dieselReference

Drawbar (claimed)45.8 kWReference

Plows6Reference

Drawbar (tested)45.8 kWReference

Belt (tested)62.7 kWReference

General Motors 3-71Reference

blower dieselReference

3-cylinderReference

liquid-cooledReference

two-cycle engine with mechanical blowerReference

Displacement3.5 LReference

Bore/Stroke108 x 127 mmReference

Compression17:1Reference

Rated RPM1800Reference

Starter volts12Reference

Belt power (max)62.7 kWReference

Max power45.8 kWReference

Transmission

6-speed gearReference

TypegearReference

Gears6 forward and 2 reverseReference

Clutchdry discReference

PTO & Hydraulics

PTO (claimed)62.7 kWReference

Rear PTOindependentReference

Rear PTO Type540Reference

Dimensions

Wheelbase202 cmReference

Weight4989 kgReference

Front tire7.50-18Reference

Rear tire18-26Reference

Ag front7.50-18Reference

Ag rear18-26Reference

Ag rear14-34Reference

Ag rear15-34Reference

Front tread152 cmReference

Rear tread167 cmReference

990 Serial Numbers

195867828Reference

195971245Reference

196084487Reference

1961110064Reference

Final115469Reference

FAQ: How to read a serial number table.Reference

Capacities

Diameter31 cmReference

Width22 cmReference

RPM1021Reference

Speed998.83 meters/minReference

Test results

Diesel 6-speed 2WDJuly 7 - 18, 1958Link: Nebraska Tractor Test 661 fileReference

Belt fuel use (max)23.8 l/hourReference

Drawbar performanceReference

Fuel use18.9 l/hourReference

Gear 3 used for power test.Reference

Max pull5728 kgReference

Gear 1 used for pull test.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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