Big Bud 400/20
Power
400 hp
Production
1979-1981
Engine
Detroit Diesel 8V-92T, 8-cylinder
Transmission
Fuller Roadranger RT 12513
Weight
50000 lbs [22680 kg]
Drive
4WD
Introduction
Big Bud 400/20 Four-Wheel Drive Tractor
The Big Bud 400/20 is a heavy-duty four-wheel drive tractor manufactured in Havre, Montana, between 1979 and 1981. Designed for large-scale agricultural operations, this machine represents a significant era of high-horsepower American tractor engineering.
Engine and Powertrain
The tractor is powered by a Detroit Diesel 8V-92T, an 8-cylinder turbocharged diesel engine with a 12.1-liter displacement. It produces 400 horsepower at a rated speed of 2100 RPM. The engine features a liquid-cooling system and a 19:1 compression ratio, utilizing a 24-volt electric starter. Power is managed through a Fuller Roadranger RT 12513 transmission, which provides 12 forward and 2 reverse gears.
Hydraulics and Steering
The hydraulic system utilizes a closed-center load-sensing configuration to provide efficient power to implements. It includes four valves with a pump flow capacity of 36 gallons per minute (136.3 liters per minute). Steering is managed through an articulated power steering system, with a dedicated steering flow of 35 gallons per minute (132.5 liters per minute).
Dimensions and Chassis
With a wheelbase of 150 inches (381 cm) and an overall width of 120 inches (304 cm), the machine is built for stability during heavy traction work. The tractor has a shipping weight of 40,000 lbs (18,144 kg) and a maximum operating weight of 50,000 lbs (22,680 kg). It is equipped with pneumatic drum brakes and final planetary drives to handle the high torque output.
Operator Environment
The unit comes standard with the Cruiser Cab, which includes factory-installed air conditioning to provide a controlled environment for the operator during extended field operations.
Conclusion
The Big Bud 400/20 is a specialized high-horsepower tractor suitable for intensive cultivation and large-scale primary tillage. Its robust construction, combined with its articulated steering and load-sensing hydraulics, makes it a reliable asset for heavy-duty agricultural tasks.
Production Information of Big Bud, 400/20
- Original price was $109,000 in 1978
- Four-wheel Drive (4WD) tractor
- Built in Havre, Montana, USA
| Manufacturer | Big Bud |
|---|
Dimension and Tires Information of Big Bud, 400/20
| Max weight | 50000 lbs [22680 kg] |
|---|---|
| Wheelbase | 150 inches [381 cm] |
| Height (exhaust) | 156 inches [396 cm] |
| Height (cab) | 144.5 inches [367 cm] |
| Length | 267.6 inches [679 cm] |
| Ground clearance | 14.5 inches [36 cm] |
| Shipping weight | 40000 lbs [18144 kg] |
| Width | 120 inches [304 cm] |
| Ag front | 24.5-32 |
|---|---|
| Ag rear | 30.5-32 |
| Ag rear | 24.5-32 |
| Ag front | 30.5-32 |
Engine Specifications of Big Bud, 400/20
- Detroit Diesel 8V-92T
- Liquid-cooled
- Turbocharged diesel
- 8-cylinder
| Starter volts | 24 |
|---|---|
| Displacement | 736 ci [12.1 L] |
| Compression | 19:1 |
| Bore/Stroke | 4.84x5.00 inches [123 x 127 mm] |
| Starter | Electric |
| Rated RPM | 2100 |
| Power | 400 hp [298.3 kW] |
Transmission Information of Big Bud, 400/20
Transmission variants 1
| Transmission | Fuller Roadranger RT 12513 |
|---|---|
| Type | Gear |
| Gears | 12 forward and 2 reverse |
Mechanical Specs of Big Bud, 400/20
- Four-wheel drive
- Cruiser Cab standard with air-conditioning.
- Pneumatic drum brakes
- Articulated power steering
| Final drives | Planetary |
|---|
Power Information of Big Bud, 400/20
| Engine | 400 hp [298.3 kW] |
|---|
Hydraulics Specifications of Big Bud, 400/20
| Type | Closed center load sensing |
|---|---|
| Steering flow | 35 gpm [132.5 lpm] |
| Valves | 4 |
| Pump flow | 36 gpm [136.3 lpm] |
Electrical System of Big Bud, 400/20
| Ground | Negative |
|---|---|
| Battery volts | 12 |
| Charging system | Alternator |
| Charging amps | 75 |
Where it sits
With 400 HP, the Big Bud 400/20 sits between 370 (370 HP) and 402 (402 HP) in Big Bud's range. Its power puts it in the 99th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the Big Bud 400/20 have?
The Big Bud 400/20 delivers 400 HP.
What years was the Big Bud 400/20 produced?
The Big Bud 400/20 was produced in 1979-1981.
What engine does the Big Bud 400/20 have?
The Big Bud 400/20 is powered by a Detroit Diesel 8V-92T, 8-cylinder engine.
What transmission does the Big Bud 400/20 use?
The Big Bud 400/20 uses a Fuller Roadranger RT 12513 transmission.
How much does the Big Bud 400/20 weigh?
The Big Bud 400/20 weighs 50000 lbs [22680 kg].
Is the Big Bud 400/20 4WD?
The Big Bud 400/20 is available in 4WD.