Big Bud HN320
Power
320 hp
Production
1976-1978
Engine
Turbocharged intercooled diesel, 6-cylinder
Transmission
Fuller
Weight
36000 lbs [16329 kg]
Drive
4WD
Introduction
Big Bud HN320: 4WD Heavy-Duty Tractor (1976-1978)
The Big Bud HN320 is a high-horsepower four-wheel drive agricultural tractor produced between 1976 and 1978 in Havre, Montana, USA. Designed for large-scale farming operations, this machine focuses on heavy traction and power delivery.
Engine and Powertrain
The tractor is powered by a Cummins NT855 engine, a 14.0-liter, 6-cylinder liquid-cooled diesel unit. It features a turbocharger and intercooler system, producing 320 horsepower at a rated engine speed of 2100 RPM. The engine is started via an electric system and features a bore/stroke configuration of 5.50 by 6.00 inches.
Transmission and Drive System
Equipped with a Fuller transmission, the HN320 provides 12 forward gears and 2 reverse gears, allowing for precise speed selection during field work. The power is delivered to all four wheels, ensuring maximum traction in demanding soil conditions, aided by hydrostatic power steering for operator control.
Hydraulics and Dimensions
The tractor utilizes an open-center hydraulic system with a total flow capacity of 40 gpm (151.4 lpm). This flow is split between 20 gpm for steering and 20 gpm for general pump operations. With a shipping weight of 36,000 lbs (16,329 kg) and fitted with 23.1x30 agricultural tires on both front and rear axles, the machine is engineered for structural stability and weight distribution.
Conclusion
The Big Bud HN320 serves as a robust solution for large-scale agricultural tasks requiring significant drawbar pull and consistent hydraulic performance. Its combination of a high-displacement Cummins engine and a reliable 4WD drivetrain makes it a historically significant asset for heavy-duty field applications.
Production Information of Big Bud, HN320
- Four-wheel Drive (4WD) tractor
- Built in Havre, Montana, USA
| Manufacturer | Big Bud |
|---|
Dimension and Tires Information of Big Bud, HN320
| Shipping weight | 36000 lbs [16329 kg] |
|---|
| Ag front | 23.1x30 |
|---|---|
| Ag rear | 23.1x30 |
Engine Specifications of Big Bud, HN320
- Cummins NT855
- Liquid-cooled inline
- Turbocharged intercooled diesel
- 6-cylinder
| Power | 320 hp [238.6 kW] |
|---|---|
| Displacement | 855 ci [14.0 L] |
| Rated RPM | 2100 |
| Bore/Stroke | 5.50x6.00 inches [140 x 152 mm] |
| Starter type | Electric |
Transmission Information of Big Bud, HN320
Transmission variants 1
| Transmission | Fuller |
|---|---|
| Type | Gear |
| Gears | 12 forward and 2 reverse |
Mechanical Specs of Big Bud, HN320
- Four-wheel drive
- Cab standard.
| Steering | Hydrostatic power |
|---|
Power Information of Big Bud, HN320
| Engine | 320 hp [238.6 kW] |
|---|
Hydraulics Specifications of Big Bud, HN320
| Type | Open center |
|---|---|
| Steering flow | 20 gpm [75.7 lpm] |
| Pump flow | 20 gpm [75.7 lpm] |
| Total flow | 40 gpm [151.4 lpm] |
Where it sits
With 320 HP, the Big Bud HN320 sits between HN250 (250 HP) and HN350 (350 HP) in Big Bud's range. Its power puts it in the 97th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the Big Bud HN320 have?
The Big Bud HN320 delivers 320 HP.
What years was the Big Bud HN320 produced?
The Big Bud HN320 was produced in 1976-1978.
What engine does the Big Bud HN320 have?
The Big Bud HN320 is powered by a Turbocharged intercooled diesel, 6-cylinder engine.
What transmission does the Big Bud HN320 use?
The Big Bud HN320 uses a Fuller transmission.
How much does the Big Bud HN320 weigh?
The Big Bud HN320 weighs 36000 lbs [16329 kg].
Is the Big Bud HN320 4WD?
The Big Bud HN320 is available in 4WD.