The Bobcat S550 skid-steer loader features a comprehensive instrument cluster that keeps you informed of machine health and operational status. Understanding these indicators ensures safe and efficient operation, whether you're digging, lifting, or grading.
Bobcat S550 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning | RED | A critical system fault (e.g., engine, hydraulic, or safety) has been detected; the machine may enter limp mode or shut down. | Stop the machine safely, check the gauge cluster for accompanying symbols, and contact Bobcat service if unresolved. | |
| Check Engine | AMBER | The engine control unit has detected an emissions or performance fault, such as a sensor or fuel system issue. | Reduce load and operate at low RPM; if the light blinks, stop immediately and schedule diagnostic check. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe levels, risking severe engine damage if not addressed. | Stop the engine immediately, check oil level, and inspect for leaks; do not restart until resolved. | |
| Battery / Charging | RED | The charging system is not supplying sufficient voltage, likely due to a faulty alternator, belt, or battery. | Check battery connections and alternator belt; if light persists, replace battery or alternator. | |
| Coolant Temperature | RED | Engine coolant temperature is excessively high, risking overheating and component failure. | Immediately reduce load and idle; check coolant level and radiator for debris; shut down if overheating continues. | |
| Hydraulic Oil | RED | Hydraulic fluid temperature is too high or pressure is low, affecting loader and drive performance. | Stop and allow hydraulics to cool; check fluid level and condition; inspect for leaks or clogged filters. | |
| Fasten Seat Belt | RED | The operator's seat belt is not fastened; the machine may lock out hydraulics or prevent start. | Fasten the seat belt before attempting to operate; check seat switch if belt is properly engaged. | |
| Parking Brake | RED | Parking brake is engaged while in drive, or a brake system fault is present. | Release parking brake before moving; if light stays on, check brake linkage and switch. | |
| Glow Plug / Preheat | AMBER | The glow plugs are preheating the engine for cold-start conditions; wait until the light goes out before cranking. | Turn key to preheat; do not start until indicator turns off (diesel engines only). | |
| Air Filter | AMBER | The engine air filter is restricted; cleaning or replacement is needed to maintain airflow and power. | Inspect air filter element; clean or replace as directed in the S550 operator manual. | |
| Fuel Filter / Water Separator | AMBER | Water has accumulated in the fuel filter/water separator, or the filter is clogged. | Drain water from separator using the drain valve; replace fuel filter if necessary. | |
| Service / Hour Meter | GREEN | The hour meter display indicates when routine maintenance (oil change, filter) is due based on engine hours. | Follow the Bobcat S550 maintenance schedule: service engine oil, filters, and hydraulic system at indicated intervals. | |
| Work Lights | GREEN | The auxiliary work lights are turned on, providing illumination for night or low-light operation. | No action needed; switch off when daylight operation resumes to save battery. | |
| Beacon / Rotating Light | GREEN | The rotating beacon or strobe hazard light is active for site safety visibility. | Use in designated areas; deactivate when not required to reduce electrical load. | |
| Door Open | RED | The cab door is not fully closed or latched, posing safety and noise concerns. | Close and latch the door securely; check for obstructions in the door seal or striker. |
15 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Low coolant level
- Radiator fins clogged with debris
- Failed thermostat or water pump
What to do
Stop the Bobcat S550 immediately, let the engine cool, then check coolant level and clean the radiator with compressed air or water; if the issue recurs, inspect the thermostat and water pump.
Hydraulic System Failure
Common causes
- Low hydraulic oil level
- Contaminated or degraded hydraulic fluid
- Leaking hose or cylinder seal
What to do
Shut down the machine, check hydraulic oil level (fill to full mark with approved fluid), and inspect all hoses and fittings for leaks; replace damaged components and change filters if fluid is milky or dark.
Transmission Overheating
Common causes
- Low transmission fluid
- Blocked cooler fins
- Excessive load or high-speed operation in low range
What to do
Reduce load and operate in a lower gear; check transmission fluid level and condition, clean the oil cooler, and allow the machine to idle while monitoring temperature.
Brake System Malfunction
Common causes
- Low brake fluid level
- Worn brake pads or discs
- Air in the brake lines
What to do
Check brake fluid reservoir and top up if low; inspect brake pads for wear (replace if below service limit); bleed brakes to remove air using the procedure in the S550 manual.
Engine Oil Leak
Common causes
- Loose drain plug or oil filter
- Cracked engine block or oil pan
- Faulty valve cover gasket
What to do
Locate the leak source, tighten the drain plug or oil filter, and clean the area; if the leak persists, replace gaskets or seals—consult the Bobcat S550 service manual for torque specs.
Frequently Asked Questions
Why does my Bobcat S550 display a red oil pressure light after start-up?
If the red oil pressure light stays on after a few seconds, immediately shut down the engine. Check the oil level (dipstick) and look for leaks; low oil or a faulty sensor may cause this—top up and restart only if normal, otherwise seek service.
The amber check engine light came on while I was moving dirt. Should I stop?
If steady, you can continue but reduce load and operate at low RPM until you can diagnose. If blinking, stop immediately to prevent catalytic converter damage and schedule a diagnostic scan with a Bobcat dealer.
What does the hydraulic oil temperature light indicate on my S550?
This light warns that the hydraulic oil is too hot, often from continuous heavy usage or low fluid. Stop and let the hydraulics cool; check oil level and fan operation; avoid high-load cycles until temperature drops.
My Bobcat S550 won't start and the glow plug light stays on. What's wrong?
If the glow plug light remains on after preheating, a relay or glow plug may be faulty. Turn the key off, wait 10 seconds, then try again; if no change, check fuses and wiring—replace glow plugs or relay as needed.
The air filter indicator came on, but the filter looks clean. What should I do?
Even if visually clean, the filter may be partially clogged with fine dust. Tap out loose debris or replace the filter (S550 part number 6686600). Also check the intake hose for blockages; reset the service reminder if equipped.
How do I reset the service hour meter after an oil change on my S550?
After performing maintenance, turn the key to the ON position, press and hold the hour meter reset button for 3 seconds until the service light flashes, then cycles off. Refer to the operator’s manual for exact steps.