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Tractor · 1979Unverified

Big Bud 400/20

Name: Big Bud 400/20
Brand: Big Bud

Big Bud 400/20 — 3 Series · 400 hp. Reference specifications; pending source verification.

The Big Bud 400/20 is a tractor with a rating of approximately 400 hp, positioning it at the more powerful end of its class. It was manufactured between 1979 and 1981. The tractor is equipped with an 8-cylinder turbocharged diesel liquid-cooled engine, four-wheel drive, and a powershift transmission. Its operating weight is listed at 18144 kg, making it suitable for operations covering 1,500+ acres.

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

Rated power

400 hp

Weight

18144 kg

Catalogue coverage

Variants represented

Richest spec table

52 rows

Recorded power

400 hp

Recorded weight

18144 kg

Transmissions

12-speed gear

Production years

1979-1981

Verified variants

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

Hover a source tag to verify

Overview

ManufacturerBig BudReference

Four-wheel Drive (4WD) tractorReference

Built in Havre, Montana, USAReference

Original price was $109,000 in 1978Reference

Four-wheel driveReference

Final drivesplanetaryReference

Articulated power steeringReference

Pneumatic drum brakesReference

Cruiser Cab standard with air-conditioning.Reference

Variants

400/20gear shiftReference

400/30power shiftReference

Engine

Detroit Diesel 12.1L 8-cyl dieselReference

Fuel tank2081.8 LReference

Engine298.3 kWReference

Detroit Diesel 8V-92TReference

turbocharged dieselReference

8-cylinderReference

liquid-cooledReference

Displacement12.1 LReference

Bore/Stroke123 x 127 mmReference

Power298.3 kWReference

Compression19:1Reference

Rated RPM2100Reference

StarterelectricReference

Starter volts24Reference

Transmission

12-speed gearReference

TransmissionFuller Roadranger RT 12513Reference

TypegearReference

Gears12 forward and 2 reverseReference

PTO & Hydraulics

Typeclosed center load sensingReference

Valves4Reference

Pump flow136.3 lpmReference

Steering flow132.5 lpmReference

Dimensions

Wheelbase381 cmReference

Weight18144 kgReference

Front tire24.5-32Reference

Rear tire24.5-32Reference

Ag front24.5-32Reference

Ag rear24.5-32Reference

Ag front30.5-32Reference

Ag rear30.5-32Reference

Length679 cmReference

Width304 cmReference

Height (cab)367 cmReference

Height (exhaust)396 cmReference

Shipping weight18144 kgReference

Max weight22680 kgReference

Ground clearance36 cmReference

Electrical

GroundnegativeReference

Charging systemalternatorReference

Charging amps75Reference

Battery volts12Reference

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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