Steiger Cougar III ST-251
Power
250 hp
Production
1976-1982
Engine
Turbocharged diesel, 6-cylinder
Transmission
Spicer SST 1010
Weight
26610 lbs [12070 kg]
Drive
4WD
Introduction
Steiger Cougar III ST-251 Four-Wheel Drive Tractor
The Steiger Cougar III ST-251 is a heavy-duty articulated 4WD tractor manufactured between 1976 and 1982 in Fargo, North Dakota, USA. Designed for large-scale agricultural operations, this machine focuses on high-traction performance and durability.
Engine and Performance
The tractor is powered by a Cummins NT-855C turbocharged diesel engine. This 14.0 L, 6-cylinder liquid-cooled unit produces 250 hp at a rated 2100 RPM. With a peak torque of 850 lb-ft (1152.6 Nm) achieved at 1400 RPM, the engine is configured to provide consistent pulling power under heavy load conditions.
Transmission and Drivetrain
The drivetrain features an articulated power steering system and four-wheel drive, utilizing Raba 598 axles for both front and rear. Transmission options include a 10-speed configuration or a 20-speed unit, both utilizing a hydraulic dry disc clutch system to manage power delivery to the wheels.
Hydraulic System
The hydraulic system is an open-center design with a pump flow capacity of 30.8 gpm (116.6 lpm) at a pressure of 2250 psi (155.1 bar). The system supports up to four valves, providing the necessary flow for operating a wide range of large-scale implements.
Operator Environment and Dimensions
The tractor comes equipped with the Safari Cab, which includes standard heating and air conditioning to maintain operator comfort. The machine has a wheelbase of 128 inches and a total length of 252 inches. Its shipping weight is approximately 26,610 lbs, with a maximum weight capacity of 34,000 lbs.
Conclusion
The Steiger Cougar III ST-251 is built for demanding field work requiring significant drawbar power. Its combination of a high-displacement Cummins engine, articulated chassis, and substantial hydraulic capacity makes it a suitable machine for heavy tillage and large-acreage cultivation.
Production Information of Steiger, Cougar III ST-251
- Original price was $75,000 in 1982
- Four-wheel Drive (4WD) tractor
- Built in Fargo, North Dakota, USA
| Manufacturer | Steiger |
|---|
Dimension and Tires Information of Steiger, Cougar III ST-251
- Raba 598 rear axle
| Front axle | Raba 598 |
|---|---|
| Wheelbase | 128 inches [325 cm] |
| Shipping weight | 26610 lbs [12070 kg] |
| Height (exhaust) | 155.8 inches [395 cm] |
| Length | 252 inches [640 cm] |
| Max weight | 34000 lbs [15422 kg] |
| Width | 96 inches (tractor body) [243 cm] |
| Ag front | 23.1-34 |
|---|---|
| Ag rear | 23.1-34 |
Engine Specifications of Steiger, Cougar III ST-251
- Cummins NT-855C
- Liquid-cooled
- 6-cylinder
- Turbocharged diesel
| Coolant capacity | 56 qts [53.0 L] |
|---|---|
| Oil capacity | 44 qts [41.6 L] |
| Compression | 14.1:1 |
| Torque | 850 lb-ft [1152.6 Nm] |
| Idle RPM | 830-2260 |
| Displacement | 855 ci [14.0 L] |
| Power | 250 hp [186.4 kW] |
| Rated RPM | 2100 |
| Bore/Stroke | 5.50x6.00 inches [140 x 152 mm] |
| Starter volts | 12 |
| Starter | Electric |
| Torque RPM | 1400 |
Transmission Information of Steiger, Cougar III ST-251
Transmission variants 1
| Transmission | Spicer SST 1010 |
|---|---|
| Gears | 10 forward and 2 reverse |
| Clutch | Hydraulic dry discs |
Transmission variants 2
- Ten-speed transmission with two-speed transfer case.
| Gears | 20 forward and 4 reverse |
|---|---|
| Clutch | 394mm dry disc |
- 10-speed
- 20-speed
Mechanical Specs of Steiger, Cougar III ST-251
- Four-wheel drive
- Safari Cab standard with heat and air-conditioning.
- Hydraulic disc brakes
- Articulated power steering
| Final drives | Outboard planetary |
|---|
Power Information of Steiger, Cougar III ST-251
- Https://www.tractordata.com/farm-tractors/001/0/1/1015-steiger-cougar-iii-st-251-tests.html
Hydraulics Specifications of Steiger, Cougar III ST-251
| Type | Open center |
|---|---|
| Pump flow | 30.8 gpm [116.6 lpm] |
| Valves | 4 |
| Capacity | 33 gal [124.9 L] |
| Pressure | 2250 psi [155.1 bar] |
Three-Point Hitch of Steiger, Cougar III ST-251
| Rear Type(optional) | III |
|---|
Electrical System of Steiger, Cougar III ST-251
| Battery Group | 8D |
|---|---|
| Ground | Negative |
| Battery volts | 12 |
| Batteries | 2 |
| Charging system | Alternator |
| Battery AH | 208 |
| Charging amps | 90 |
Where it sits
With 250 HP, the Steiger Cougar III ST-251 sits between Steiger #1 (238 HP) and Cougar III PTA-251 (251 HP) in Steiger's range. Its power puts it in the 94th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the Steiger Cougar III ST-251 have?
The Steiger Cougar III ST-251 delivers 250 HP.
What years was the Steiger Cougar III ST-251 produced?
The Steiger Cougar III ST-251 was produced in 1976-1982.
What engine does the Steiger Cougar III ST-251 have?
The Steiger Cougar III ST-251 is powered by a Turbocharged diesel, 6-cylinder engine.
What transmission does the Steiger Cougar III ST-251 use?
The Steiger Cougar III ST-251 uses a Spicer SST 1010 transmission.
How much does the Steiger Cougar III ST-251 weigh?
The Steiger Cougar III ST-251 weighs 26610 lbs [12070 kg].
Is the Steiger Cougar III ST-251 4WD?
The Steiger Cougar III ST-251 is available in 4WD.