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 rated power output is 250 hp 186.4 kW. Transmission: Spicer SST 1010. Operating weight: 26610 lbs 12070 kg.

Overview

	1976 - 1982 III SeriesFour-wheel Drive (4WD) tractor
1976 - 1982
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.