| Manufacturer |
Steiger |
| Price |
75,000(USD) |
| Model |
Cougar III ST-251 |
| Equipment Type |
Four-wheel Drive 4WD Tractors |
| Factory |
Fargo, North Dakota, USA |
NEBRASKA TRACTOR TEST 1233
| Description |
Diesel 10-speed 4WD March 26 - April 30, 1977 Link: Nebraska Tractor Test 1233 file Drawbar performance Gear 6 used for power test Gear 2 used for pull test |
| Max power |
199.04hp / 148.4kW |
| Fuel use |
13.5gal/hour / 51.1l/hour |
| Max pull |
26,880lbs / 12192kg |
STEIGER COUGAR III ST-251 POWER
| Engine |
250hp / 186.4kW |
| Drawbar (claimed) |
206hp / 153.6kW |
| Drawbar (tested) |
199.04hp / 148.4kW |
ENGINE DETAIL
The Steiger Cougar III ST-251 features a robust Cummins NT-855C engine, delivering 250 horsepower and substantial torque of 850 lb-ft at 1400 RPM, ideal for high-demand agricultural applications. With a high compression ratio of 14.1:1, it offers efficient combustion but may require high-quality fuel to prevent knocking. Notably, the oil and coolant capacities of 44 quarts and 56 quarts, respectively, indicate a well-designed cooling system, but managing these capacities is critical for maintenance and operational efficiency in extended use scenarios.
| Description |
Cummins NT-855C turbocharged diesel 6-cylinder liquid-cooled |
| Displacement |
855ci / 14.0L |
| Bore/Stroke |
5.50x6.00inches / 140x 152mm |
| Power |
250hp / 186.4kW |
| Compression |
14.1:1 |
| Rated RPM |
2100 |
| Idle RPM |
830-2260 |
| Torque |
850lb-ft / 1152.6Nm |
| Torque RPM |
1400 |
| Starter volts |
12 |
| Oil capacity |
44qts / 41.6L |
| Coolant capacity |
56qts / 53.0L |
STEIGER COUGAR III ST-251 ENGINE
The Steiger Cougar III ST-251 is powered by a robust Cummins 14.0L 6-cylinder diesel engine, delivering substantial torque for demanding agricultural tasks. This high-capacity engine offers advantages in power efficiency and durability, making it suitable for heavy tillage and large-scale operations. However, its weight and size may present challenges in maneuverability in tighter fields or steep terrains.
| Description |
Cummins 14.0L 6-cyl diesel |
TRANSMISSIONS OVERVIEW
The Steiger Cougar III ST-251 features a 10-speed transmission that allows for efficient power management, enhancing both torque and speed in varied agricultural applications. The 20-speed option offers greater precision in power distribution, optimizing performance in diverse terrain and conditions. However, operators may face a learning curve with the transmission controls to maximize the tractor's full potential.
| Description |
10-speed 20-speed |
TRANSMISSION 1
The Steiger Cougar III ST-251 features a Spicer SST 1010 transmission with 10 forward gears and 2 reverse, providing versatility for various agricultural tasks. The hydraulic dry disc clutch enhances durability and ease of maintenance, making it suitable for heavy-duty operations. However, operators should be aware of the potential for significant wear in heavy load conditions due to clutch friction heat.
| Transmission |
Spicer SST 1010 |
| Gears |
10 forward and 2 reverse |
| Clutch |
hydraulic dry discs |
TRANSMISSION 2
The Steiger Cougar III ST-251's ten-speed transmission, combined with a two-speed transfer case, offers versatile gear selection for various field conditions, enhancing its adaptability for different farming tasks. The 394mm dry disc clutch provides robust engagement but may require careful operation to prevent wear under heavy load. Overall, this configuration is beneficial for both high-torque applications and precise maneuvering, making it ideal for operations requiring both power and finesse.
| Gears |
20 forward and 4 reverse |
| Clutch |
394mm dry disc |
| Description |
Ten-speed transmission with two-speed transfer case |
MECHANICAL
The Steiger Cougar III ST-251's 4x4 articulated chassis enhances maneuverability and traction, making it ideal for diverse terrains and heavy-duty applications. Its hydrostatic power steering offers responsive handling, while the hydraulic disc brakes ensure reliable stopping power under load. The choice of 10 or 20-speed transmission provides flexibility in speed management, though owners should consider potential maintenance complexities associated with an advanced multi-speed system.
| Chassis |
4x4 articulated 4WD |
| Final drives |
outboard planetary |
| Steering |
hydrostatic power |
| Brakes |
hydraulic disc |
| Cab |
Safari Cab standard with heat and air-conditioning |
| Transmissions |
10-speed 20-speed |
CAPACITY
| Fuel |
267gal / 1010.6L |
| Hydraulic system |
33gal / 124.9L |
HYDRAULICS
| Type |
open center |
| Capacity |
33gal / 124.9L |
| Pressure |
2250psi / 155.1bar |
| Valves |
4 |
| Pump flow |
30.8gpm / 116.6lpm |
TRACTOR HITCH
STEIGER COUGAR III ST-251 TIRES
The Steiger Cougar III ST-251 tractor features 23.1-34 agricultural tires both front and rear, which enhance traction and stability across diverse terrains. This size allows for effective weight distribution, improving field performance in soil compaction mitigation. However, operators should be aware that tire choice may impact fuel efficiency and ground disturbance, particularly in softer soils.
| Ag front |
23.1-34 |
| Ag rear |
23.1-34 |
DIMENSIONS
| Wheelbase |
128inches / 325cm |
| Length |
252inches / 640cm |
| Width |
96inches / 243cm (tractor body) |
| Height (exhaust) |
155.8inches / 395cm |
| Shipping weight |
26,610lbs / 12070kg |
| Max weight |
34,000lbs / 15422kg |
| Front axle |
Raba 598 |
| Rear axle |
Raba 598 |
DIMENSIONS & TIRES
The Steiger Cougar III ST-251's 128-inch wheelbase provides excellent stability during heavy-duty operations, ideal for cultivating and tilling in large fields. At 26,610 lbs, the tractor offers substantial traction, though its weight can limit maneuverability in tighter spaces. The 23.1-34 tires enhance flotation and reduce soil compaction but may require careful pressure management in varying terrain conditions.
| Wheelbase |
128inches / 325cm |
| Weight |
26,610lbs / 12070kg |
| Front tire |
23.1-34 |
| Rear tire |
23.1-34 |
COUGAR III ST-251 SERIAL NUMBERS
| 1976 |
106-00001 |
| 1977 |
106-00166 |
| 1978 |
106-00256 |
| 1979 |
106-00370 |
| 1980 |
106-00737 |
| 1981 |
106-01055 |
| 1982 |
106-01501 |
ELECTRICAL
| Ground |
negative |
| Charging system |
alternator |
| Charging amps |
90 |
| Batteries |
2 |
| Battery volts |
12 |
| Battery AH |
208 |
| Battery Group |
8D |
