Steiger Cougar III ST-250

The Steiger Cougar III ST-250 is a tractor produced by Steiger. It is equipped with a 638 ci 10.5 L engine. The listed engine power is Diesel (listed): 250 hp / 186.4 kW. Transmission: Dana-Spicer 1010-2A. Operating weight: 25000 lbs 11340 kg.

Engine Power

Diesel (listed): 250 hp / 186.4 kW

Fuel & Capacities

267 gal 1010.6 L

Transmission

Dana-Spicer 1010-2A

Operating Weight

25000 lbs 11340 kg

Overview

	1976 - 1983 III SeriesFour-wheel Drive (4WD) tractor III Series Four-wheel Drive (4WD) tractor

Production
Manufacturer	Steiger
Four-wheel Drive (4WD) tractor
Built in Fargo, North Dakota, USA
Original price was $50,000 in 1983

Steiger Cougar III ST-250 Engine
Caterpillar 10.5L 6-cyl diesel
Fuel tank	267 gal 1010.6 L
Engine details ...

Steiger Cougar III ST-250 Power
Engine	250 hp 186.4 kW
Drawbar (claimed)	210 hp 156.6 kW
Drawbar (tested)	214.51 hp 160.0 kW
Performance test details ...

Mechanical
Four-wheel drive
Final drives	outboard planetary
Articulated power steering
Hydraulic dry disc brakes
Safari Cab standard with heat and air-conditioning.

Hydraulics
Type	open center
Pressure	2250 psi 155.1 bar
Valves	3 to 5
Pump flow	30.8 gpm 116.6 lpm

Tractor hitch
Rear Type	III OptOptional

Dimensions & Tires
Wheelbase	128 inches 325 cm
Weight	25000 lbs 11340 kg
Front tire	23.1-34
Rear tire	23.1-34
Full dimensions and tires ...

Electrical
Ground	negative
Charging system	alternator
Charging amps	90
Battery volts	12

References

ST Tractors published in 1981, by Steiger
ST Tractors published in 1982, by Steiger
Series III published in 1976, by Steiger

Engine

Engine Detail — 638 ci / 10.5 L Diesel

Manufacturer	Caterpillar 3306DITA
Configuration	turbocharged aftercooled diesel, 6-cylinder, liquid-cooled inline
Displacement	638 ci 10.5 L
Bore/Stroke	4.75x6.00 inches 121 x 152 mm
Power	250 hp 186.4 kW
Air cleaner	two paper elements
Compression	15:1
Rated RPM	2100
Torque	860 lb-ft 1166.2 Nm
Torque RPM	1300
Starter	electric
Starter volts	12
Oil capacity	29 qts 27.4 L
Coolant capacity	56 qts 53.0 L

Transmission

Transmission options
10-speed
20-speed

Transmission — 10 forward and 2 reverse

Gears

10 forward and 2 reverse

Transmission — Dana-Spicer 1010-2A

Transmission	Dana-Spicer 1010-2A
Gears	20 forward and 4 reverse
Clutch	355.6mm hydraulic dry disc
Ten-speed transmission with two-speed transfer case.

Dimensions

Steiger Cougar III ST-250 Tires
Ag front	23.1-34
Ag rear	23.1-34

Dimensions
Wheelbase	128 inches 325 cm
Length	252 inches 640 cm
Width	96 inches (tractor body) 243 cm
Height (exhaust)	155.8 inches 395 cm
Shipping weight	25000 lbs 11340 kg
Max weight	34000 lbs 15422 kg

Tests

Tractor Tests
NTTL 1239: 2200rpm diesel 10-speed 4WD
NTTL 1452: 2100rpm diesel 20-speed 4WD

Nebraska Tractor Test 1239
2200rpm diesel 10-speed 4WD April 21 - May 2, 1977 Link: Nebraska Tractor Test 1239 file
Drawbar performance
Max power	201.95 hp 150.6 kW
Fuel use	15.9 gal/hour 60.2 l/hour
Gear 6 used for power test.
Max pull	26,612 lbs 12071 kg
Gear 2 used for pull test.

Nebraska Tractor Test 1452
2100rpm diesel 20-speed 4WD 9/21/1982 Link: Nebraska Tractor Test 1452 file
Drawbar performance
Max power	214.51 hp 160.0 kW
Fuel use	13.4 gal/hour 50.7 l/hour
Gear 11 used for power test.
Max pull	29,539 lbs 13398 kg
Gear 4 used for pull test.

Photos

Steiger Cougar III ST-250 tractor photo

Recommended Implements & Sizing Guide

Engineering recommendations for Steiger Cougar III ST-250 based on its 250 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	8+ Bottom On-Land Hitch8+ 铧重型机外牵引犁	Commercial / Field Scale	High horsepower articulated/4WD field plowing.
Rotary Cutter / MowerMowing & Clearing	15 to 20 ft Batwing4.6 - 6.1 m 宽幅折叠翼	Commercial / Field Scale	Large commercial field and roadside mowing operations.
Rotary TillerSeedbed Prep	90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机	Commercial / Field Scale	Deep intensive seedbed preparation for commercial row crops.
Disc HarrowSecondary Tillage	24 to 36 ft Heavy Duty Field Disc7.3 - 11.0 m 超宽重型整地耙	Commercial / Field Scale	Broad-acre grain tillage for high-drawbar tractors.
Hay BalerHay & Forage	Large Square Baler (3x4 or 4x4)大方捆商用打捆机 (1.2x1.2 m)	Commercial / Field Scale	High-capacity commercial forage harvesting (1000 RPM PTO).

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Steiger Cougar III ST-250.

Estimated Continuous Field Runtime: 20.5 hrs

Approximately 20.5 hours of continuous field operation at ~75% rated power on a full tank (267 gal / 1010.7 L).

Estimated 75% Load Fuel Burn~13 gal/hr (49.2 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours