Overview
The Big Bud 400/20 is a four-wheel drive articulated farm tractor produced in Havre, Montana, between 1979 and 1981. It is powered by a 12.1L 8-cylinder Detroit Diesel engine rated at 400 hp and features a 12-speed gear transmission. This model is equipped with a 550-gallon fuel tank and a standard Cruiser Cab with air-conditioning.
Ideal Applications
Powertrain and Fuel Capacity:
The tractor utilizes a 400 hp turbocharged 8V-92T engine with a 24V starting system and a 550-gallon fuel tank.
Mechanical and Transmission Layout:
The drivetrain consists of a 12-speed Fuller Roadranger RT 12513 gear transmission, planetary final drives, and articulated power steering.
Physical Dimensions and Weight:
This machine is built on a 150-inch wheelbase with a shipping weight of 40,000 lbs and a maximum weight capacity of 50,000 lbs.
Production
| Description | Built in Havre, Montana, USA / Original price was $109,000 in 1978 |
|---|---|
| Drive type | Four-wheel Drive (4WD) tractor |
| Manufacturer | Big Bud |
Engine
| Engine type | Detroit Diesel 12.1L 8-cyl diesel |
|---|---|
| Fuel tank | 550 gal (2081.8 L) |
| Bore/Stroke | 4.84x5.00 inches (123 x 127 mm) |
| Compression | 19:1 |
| Description | Detroit Diesel 8V-92T / turbocharged diesel / 8-cylinder / liquid-cooled |
| Displacement | 736 ci (12.1 L) |
| Power | 400 hp (298.3 kW) |
| Rated RPM | 2100 |
| Starter | electric |
| Starter volts | 24 |
Transmission
| Gears | 12 forward and 2 reverse |
|---|---|
| Transmission | Fuller Roadranger RT 12513 |
| Transmission type | 12-speed gear |
| Type | gear |
Mechanical
| Cab | Cruiser Cab standard with air-conditioning. |
|---|---|
| Description | Articulated power steering / Pneumatic drum brakes |
| Drive type | Four-wheel drive |
| Final drives | planetary |
Hydraulics
| Pump flow | 36 gpm (136.3 lpm) |
|---|---|
| Steering flow | 35 gpm (132.5 lpm) |
| Type | closed center load sensing |
| Valves | 4 |
Electrical
| Battery volts | 12 |
|---|---|
| Charging amps | 75 |
| Charging system | alternator |
| Ground | negative |
Dimensions & Tires
| Ag front | 24.5-32 / 30.5-32 |
|---|---|
| Ag rear | 24.5-32 / 30.5-32 |
| Ground clearance | 14.5 inches (36 cm) |
| Height (cab) | 144.5 inches (367 cm) |
| Height (exhaust) | 156 inches (396 cm) |
| Length | 267.6 inches (679 cm) |
| Max weight | 50000 lbs (22680 kg) |
| Shipping weight | 40000 lbs (18144 kg) |
| Wheelbase | 150 inches (381 cm) |
| Width | 120 inches (304 cm) |
| Front tire | 24.5-32 |
| Rear tire | 24.5-32 |
| Weight | 40000 lbs (18144 kg) |
| Wheelbase | 150 inches (381 cm) |
References
| Description | 400/30 400/20 published in 1978, by Big Bud / Size Us Up published in 1979, by Big Bud |
|---|
Variants
| 400/20 | gear shift |
|---|---|
| 400/30 | power shift |