Steiger Cougar III ST-251

The Steiger Cougar III ST-251 is a tractor produced by Steiger. It is equipped with a 855 ci 14.0 L engine. The listed engine power is Diesel (listed): 250 hp / 186.4 kW. Transmission: Spicer SST 1010. Operating weight: 26610 lbs 12070 kg.

Engine Power

Diesel (listed): 250 hp / 186.4 kW

Fuel & Capacities

267 gal 1010.6 L

Transmission

Spicer SST 1010

Operating Weight

26610 lbs 12070 kg

Overview

	1976 - 1982 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 $75,000 in 1982

Steiger Cougar III ST-251 Engine
Cummins 14.0L 6-cyl diesel
Engine details ...

Steiger Cougar III ST-251 Power
Engine	250 hp 186.4 kW
Drawbar (claimed)	206 hp 153.6 kW
Drawbar (tested)	199.04 hp 148.4 kW
Performance test details ...

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

Capacity
Fuel	267 gal 1010.6 L
Hydraulic system	33 gal 124.9 L

Hydraulics
Type	open center
Capacity	33 gal 124.9 L
Pressure	2250 psi 155.1 bar
Valves	4
Pump flow	30.8 gpm 116.6 lpm

Tractor hitch
Rear Type	III OptOptional

Dimensions & Tires
Wheelbase	128 inches 325 cm
Weight	26610 lbs 12070 kg
Front tire	23.1-34
Rear tire	23.1-34
Full dimensions and tires ...

Electrical
Ground	negative
Charging system	alternator
Charging amps	90
Batteries	2
Battery volts	12
Battery AH	208
Battery Group	8D

References

ST Tractors - Cummins Powered Series III Cougar ST 251, Panther ST 310 and Panther ST 350 published in 1979, by Steiger
Series III published in 1976, by Steiger

Engine

Engine Detail — 855 ci / 14.0 L Diesel

Manufacturer	Cummins NT-855C
Configuration	turbocharged diesel, 6-cylinder, liquid-cooled
Displacement	855 ci 14.0 L
Bore/Stroke	5.50x6.00 inches 140 x 152 mm
Power	250 hp 186.4 kW
Compression	14.1:1
Rated RPM	2100
Idle RPM	830-2260
Torque	850 lb-ft 1152.6 Nm
Torque RPM	1400
Starter	electric
Starter volts	12
Oil capacity	44 qts 41.6 L
Coolant capacity	56 qts 53.0 L

Transmission

Transmission options
10-speed
20-speed

Transmission — Spicer SST 1010

Transmission	Spicer SST 1010
Gears	10 forward and 2 reverse
Clutch	hydraulic dry discs

Transmission — 20 forward and 4 reverse

Gears	20 forward and 4 reverse
Clutch	394mm dry disc
Ten-speed transmission with two-speed transfer case.

Dimensions

Steiger Cougar III ST-251 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	26610 lbs 12070 kg
Max weight	34000 lbs 15422 kg
Front axle	Raba 598
Raba 598 rear axle

Tests

Nebraska Tractor Test 1233
Diesel 10-speed 4WD March 26 - April 30, 1977 Link: Nebraska Tractor Test 1233 file
Drawbar performance
Max power	199.04 hp 148.4 kW
Fuel use	13.5 gal/hour 51.1 l/hour
Gear 6 used for power test.
Max pull	26,880 lbs 12192 kg
Gear 2 used for pull test.

Photos

Steiger Cougar III ST-251, front-right view.

Steiger Cougar III ST-251, right side.

Recommended Implements & Sizing Guide

Engineering recommendations for Steiger Cougar III ST-251 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-251.

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