Steiger Cougar III ST-250

Last Updated: July 2024

Overview

The Steiger Cougar III ST-250 represents a robust Four-wheel Drive (4WD) tractor known for its power and versatility in agricultural applications. Equipped with an articulated chassis design, this tractor comes complete with a Caterpillar 3306DITA engine that delivers up to 252.10 horsepower at 2100 rpm, providing ample strength for heavy-duty tasks. Its hydrostatic power steering system ensures responsive control over the tractor's movements even under load. The transmission setup includes 20 forward gears and 4 reverse gears, allowing for a range of speed options. The engine produces a maximum torque of 807 lb-ft at 1400 rpm with a torque rise of 25.4%. The cooling system capacity and large engine displacement underscore the tractor's capability to handle extended periods of operation without overheating. This model is fitted with agricultural tires to navigate challenging terrain with ease. Its considerable length, width, and height dimensions are matched by an operating weight of 25,000 lbs, ensuring stability and good traction. The hydraulic system is capable of exerting a maximum force of 12,610 lbs at the hitch points, with a pump delivery rate of 24.4 GPM and hydraulic power of 37.6 HP at rated engine speed. The tractor is characterized by a practical operator layout, though specific details about the operator station are not specified.
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Key Specifications

Category: Utility, Four-Wheel Drive

Power Output: 252.10

Transmission: Manual

Drive Type: 4WD

Operating Weight: 25000

Fuel Type: Diesel

Steiger Cougar III ST-250 vs. Similar Tractors

Power Output
Excellent
Greater than 93% of similar tractors.
Operating Weight
Above Average
Greater than 71% of similar tractors.

Technical Specifications

Engine

Manufacturer
Caterpillar
Model
3306DITA
Cooling Type
Liquid-cooled
Cylinder Orientation
Inline
Valve Configuration
-
Fuel Type
Diesel
Induction Type
Turbocharged aftercooled
Cylinders
6
Displacement (ci)
638
Bore (in)
4.75
Stroke (in)
6
Rated RPM
2100
Power Output (hp)
252.10

Transmission

Type
Manual
Forward Gears
20
Reverse Gears
4
Total Gears
-

Dimensions

Length (in)
252
Width (in)
96 (tractor body)
Height (in)
155.8 (excluding exhaust)
Operating Weight (lb)
25000

Power Take-Off (PTO)

PTO Type
-
PTO Speed 1 (rpm)
-
PTO Speed 2 (rpm)
-
PTO Speed 3 (rpm)
-

Miscellaneous

Chassis
4x4 articulated 4WD
Drive Type
4WD
Steering Type
Hydrostatic power
Coolant Capacity (qts)
56
Front Tire Diameter (in)
34
Front Tire Width (in)
-
Rear Tire Diameter (in)
34
Rear Tire Width (in)
-
Front/Rear Rim Diameter (in)
-
Tire Type
Agricultural
Manufacture - End Year
-
Hitch Type
Three-Point Hitch (optional)
Hitch Category
Category 3
Hitch Position
Rear
Hitch Capacity (lb)
-
Operator Station Type
-
Starter Type
-
Brake Type
-
Hydraulic System Type
Open center

Test Results

Nebraska Tractor Test Laboratory - Test Date: 1982

Maximum Power and Fuel Consumption

  • Maximum Power: 252.10 HP (187.93 kW) at 2100 rpm
  • Fuel Consumption at Maximum Power: 15.86 Gal/hr (60.04 l/h) with a fuel efficiency of 0.446 lb/hp.hr (0.271 kg/kW.h)

Drawbar Performance

  • Power at Rated Engine Speed (6th Gear): 210.45 HP (156.97 kW) with a drawbar pull of 18,579 lbs (82.66 kN) and a speed of 5.69 mph (9.15 km/h)
  • Fuel Consumption at Rated Speed: 0.486 lb/hp.hr (0.296 kg/kW.h) with a fuel efficiency of 14.52 Hp.hr/gal (2.86 kW.h/l)

Torque and Engine Performance

  • Maximum Torque: 807 lb.-ft. (1094 Nm) at 1400 rpm
  • Torque Rise: 25.4% with a power increase at 1400 rpm of 10.2%

Hydraulic Performance

  • Maximum Force Exerted: 12,610 lbs (56.08 kN) at hitch points
  • Pump Delivery Rate: 24.4 GPM (92.4 l/min) at minimum pressure and rated engine speed
  • Hydraulic Power: 37.6 HP (28.0 kW) at delivery pressure of 2400 psi (165.47 bar)

Overall Efficiency

  • Fuel Efficiency at Standard PTO Speed (1000 rpm): 16.37 Hp.hr/gal (3.32 kW.h/l)
  • Fuel Consumption: 14.99 Gal/hr (56.75 l/h) at 2100 rpm



Nebraska Tractor Test Lab.(1982).Test 1452: Steiger Cougar III ST-250 Diesel (S/N 104-00331 and up) Also Steiger Cougar IV CM-250 Diesel 20-Speeds. Lincoln, NE:Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/1767