All 68 pages of this Steiger Cougar ST250, ST251, and ST270 Operator Manual (OEM #37-048) are built around one purpose: keeping your articulated tractor running right, shift after shift. Inside: wiring diagrams for the full electrical system, hydraulic schematics showing complete circuit routing from reservoir to remote ram controls, a cab instruments section covering every gauge and warning light on your dash, and a troubleshooting chapter that walks you through the most common fault conditions from hard starting to high coolant temperature. Your maintenance chapter covers air filters, battery, cooling, fuel system, and clutch adjustments with clear service intervals. Fill the Cummins NT855-C250 to 10.5 gallons of oil before startup, and keep your gross operating weight under the 32,000-lb. warranty limit. No more digging through binders for the right spec. Bookmarked and searchable; jump to any section or find any value by keyword.
What's Inside This Steiger Cougar ST250–ST270 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-8 | - |
| Specifications | 9-18 | Engine, Clutch, Transmission, Axle, Electrical, Hydraulics |
| Operating Information | 19-28 | Cab Instruments |
| Service and Maintenance | 29-44 | Air Filters, Battery Maintenance, Cooling System, Fuel System, Engine Oil, Clutch Adjustments |
| Hydraulics | 45-50 | Suction Screen, Return Filter, Oil Change Frequency, Remote Ram Controls, Flow Control Valve, Priority Valve |
| Troubleshooting | 51-55 | Hard Starting or Failure to Start, Low Power or Loss of Power, Excessive Fuel Consumption, Low Lubricating Oil Pressure, Coolant Temperature Too High, Mechanical Knocks |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Maximum warranted tractor gross weight | 32,000 lbs. | p. 11 |
| Transmission Oil Capacity (Central Sump) | 15 gals (56.8 liters) | p. 10 |
| Fuel Tank Capacity | 267 gals (1011 liters) | p. 10 |
| ROPS Cab 3/4" x 4" bolts torque | 250 ft-lbs | p. 12 |
| Center Hinge Bolts torque | 1200 ft-lbs | p. 12 |
| Standard Axle Lug Bolts torque | 450 ft-lbs | p. 13 |
| Hydraulic Pump Pressure | 2250 p.s.i. | p. 10 |
| COUGAR ST250, ST251, ST270 (with Cummins NT855-C250 engine) | ||
| Engine Rated Speed | 2100 rpm | p. 9 |
| Engine Oil Capacity (Cummins NT855-C250) | 10.5 gallons (39.5L) | p. 9 |
| COUGAR ST250, ST251, ST270 (with Caterpillar 3306 engines) | ||
| Engine Rated Speed | 2200 rpm | p. 9 |
| Engine Oil Capacity (Caterpillar 3306 models) | 26 qts. (24.4L) | p. 9 |
Steiger Cougar ST250–ST270 Common Problems This Manual Covers
Steiger Cougar tractor hard to start or cranks slowly in cold weather, engine won't fire p. 52
Check battery terminals for corrosion and verify charge level before cranking. Cold-morning no-starts are often voltage under 12.4V or contaminated fuel. Drain the primary fuel filter bowl and inspect for water or sediment. Follow the startup procedure on page 19 before suspecting a deeper fuel system problem.
Manual Section: TroubleshootingOil pressure gauge drops below normal range at idle or during field operation p. 52
Shut down immediately if oil pressure falls to the low end of the gauge. Check oil level on the dipstick before restarting. Cummins NT855-C250 engines hold 10.5 gallons (39.5L); Caterpillar 3306 engines hold 26 qts. (24.4L). Verify capacity specs on page 9 and review troubleshooting steps on page 52.
Manual Section: TroubleshootingEngine coolant temperature gauge climbing into red zone during heavy field work p. 52
Stop and let the engine idle for 3 to 5 minutes before shutting down. Never cut a hot engine cold. Check coolant level in the overflow reservoir and inspect the radiator core for chaff or crop debris blocking airflow. Troubleshooting steps for overheating begin on page 52.
Manual Section: TroubleshootingHydraulic remotes sluggish or implement won't lift to full height under load p. 45
Verify hydraulic oil level is correct and the suction screen is clean before operating. Check that the flow control valve is fully open and the priority valve is seated properly. System operating pressure should reach 2250 PSI. Hydraulic maintenance procedures and the schematic begin on page 45.
Manual Section: HydraulicsRough running and power loss after storage, fuel contamination suspected in tank p. 29
Drain the primary filter bowl and secondary fuel filter completely. The 267-gallon (1011-liter) tank accumulates sediment at the bottom, especially after long storage. Remove the tank access cover and inspect for rust scale or algae growth if draining alone does not clear the problem. Fuel system service steps begin on page 29.
Manual Section: Service and MaintenanceExcessive black smoke on acceleration or under load, engine won't reach full power p. 52
Inspect the air filter restriction indicator on the cab panel. A clogged primary element is the most common cause on these tractors. Service or replace the air filter per the maintenance schedule on page 29. Rated speed for Cummins NT855-C250 is 2100 RPM; for Caterpillar 3306, 2200 RPM. Review page 52 if smoke continues after filter service.
Manual Section: TroubleshootingFrequently Asked Questions
How do you fix ST250, ST251, ST270 tractor hard to start or cranks slowly in cold weather, engine won't fire?
Check battery terminals for corrosion and verify charge level before cranking. Cold-morning no-starts are often voltage under 12.4V or contaminated fuel. Drain the primary fuel filter bowl and inspect for water or sediment. Follow the startup procedure on page 19 before suspecting a deeper fuel system problem.
How do you fix oil pressure gauge drops below normal range at idle or during field operation?
Shut down immediately if oil pressure falls to the low end of the gauge. Check oil level on the dipstick before restarting. Cummins NT855-C250 engines hold 10.5 gallons (39.5L); Caterpillar 3306 engines hold 26 qts. (24.4L). Verify capacity specs on page 9 and review troubleshooting steps on page 52.
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