Big Bud 400/20
The Big Bud 400/20 is a tractor produced by Big Bud. It is equipped with a 736 ci 12.1 L engine. The rated power output is 400 hp 298.3 kW. Transmission: Fuller Roadranger RT 12513. Operating weight: 40000 lbs 18144 kg.
Engine Power
400 hp
298.3 kW
Fuel & Capacities
550 gal
2081.8 L
Transmission
Fuller Roadranger RT 12513
Operating Weight
40000 lbs
18144 kg
Big Bud 400/20 Serial Number & Year Decoder
Find the exact manufacture year of your tractor by checking your chassis serial number below.
Where to Find the Serial NumberThe serial number plate is commonly located on the front frame, tractor transmission housing (right side), or instrument panel badge.
Overview
 | 1979 - 1981
3 SeriesFour-wheel Drive (4WD) tractor |
|---|---|
1979 - 1981 | |
3 Series | |
Four-wheel Drive (4WD) tractor | |
Production | |
|---|---|
Manufacturer | Big Bud |
Four-wheel Drive (4WD) tractor | |
Built in Havre, Montana, USA | |
Original price was $109,000 in 1978 | |
Variants | |
|---|---|
400/20 | gear shift |
400/30 | power shift |
Big Bud 400/20 Engine | |
|---|---|
Detroit Diesel 12.1L 8-cyl diesel | |
Fuel tank | 550 gal
2081.8 L |
Engine details ...  | |
Big Bud 400/20 Transmission | |
|---|---|
12-speed gear | |
Transmission details ...  |
Big Bud 400/20 Power | |
|---|---|
Engine | 400 hp
298.3 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Final drives | planetary |
Articulated power steering | |
Pneumatic drum brakes | |
Cruiser Cab standard with air-conditioning. | |
Hydraulics | |
|---|---|
Type | closed center load sensing |
Valves | 4 |
Pump flow | 36 gpm
136.3 lpm |
Steering flow | 35 gpm
132.5 lpm |
Dimensions & Tires | |
|---|---|
Wheelbase | 150 inches
381 cm |
Weight | 40000 lbs
18144 kg |
Front tire | 24.5-32 |
Rear tire | 24.5-32 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | alternator |
Charging amps | 75 |
Battery volts | 12 |
References | |
|---|---|
 | |
400/30 400/20 published in 1978, by Big Bud | |
Size Us Up published in 1979, by Big Bud |
Engine
Engine Detail — 736 ci / 12.1 L Diesel
Manufacturer | Detroit Diesel 8V-92T |
Configuration | turbocharged diesel, 8-cylinder, liquid-cooled |
Displacement | 736 ci
12.1 L |
Bore/Stroke | 4.84x5.00 inches
123 x 127 mm |
Power | 400 hp
298.3 kW |
Compression | 19:1 |
Rated RPM | 2100 |
Starter | electric |
Starter volts | 24 |
Transmission
Transmission — Fuller Roadranger RT 12513
Transmission | Fuller Roadranger RT 12513 |
Type | gear |
Gears | 12 forward and 2 reverse |
 | |
Dimensions
Big Bud 400/20 Tires | |
|---|---|
Ag front | 24.5-32 |
Ag rear | 24.5-32 |
Ag front | 30.5-32 |
Ag rear | 30.5-32 |
Dimensions | |
|---|---|
Wheelbase | 150 inches
381 cm |
Length | 267.6 inches
679 cm |
Width | 120 inches
304 cm |
Height (cab) | 144.5 inches
367 cm |
Height (exhaust) | 156 inches
396 cm |
Shipping weight | 40000 lbs
18144 kg |
Max weight | 50000 lbs
22680 kg |
Ground clearance | 14.5 inches
36 cm |
Related models
Big Bud 400
- Power:
- 400
- Production years:
- 1986 - 1988
Big Bud 400/30
- Power:
- 400
- Production years:
- 1979 - 1981
Big Bud 402
- Power:
- 402
- Production years:
- 1986 - 1989
Big Bud 370
- Power:
- 370
- Production years:
- 1986 - 1989
Big Bud 360/10
- Power:
- 360
- Production years:
- 1979 - 1980