The Kubota Excavator KX91-3 is a compact, versatile excavator widely used for construction, landscaping, and utility work. Its instrument cluster provides important warning and indicator lights to help operators maintain safe and efficient operation. Understanding these symbols is essential for preventing downtime and avoiding costly repairs.
Kubota Excavator KX91-3 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system malfunction or severe engine issue has been detected on your KX91-3. | Stop operation immediately and investigate the cause before restarting. | |
| Master Caution | AMBER | A non-critical fault or cautionary condition has been found in one of the KX91-3’s monitored systems. | Check for additional warning lights or messages and address as soon as possible. | |
| Check Engine (MIL) | AMBER | The engine management system has detected a fault in the KX91-3’s engine or emissions controls. | Inspect for error codes and consult a Kubota technician if the light remains on. | |
| Engine Oil Pressure | RED | Oil pressure in the KX91-3’s engine has dropped to a dangerously low level. | Shut down the engine immediately and check oil level and condition. | |
| Battery / Charging | RED | The KX91-3’s charging system is not supplying power to the battery. | Inspect the alternator drive belt and battery terminals before restarting. | |
| Coolant Temperature | RED | The engine coolant temperature has exceeded safe operating limits in your KX91-3. | Stop the engine and allow it to cool before checking coolant level. | |
| Low Fuel | AMBER | The KX91-3’s fuel level is approaching empty. | Refuel as soon as possible to avoid engine stalling. | |
| Glow Plug / Preheat | AMBER | The preheat system is active, warming cylinders for easier cold starting on the KX91-3. | Wait for the light to go out before starting the engine in cold conditions. | |
| Hydraulic Oil | RED | Hydraulic oil pressure is low or temperature is abnormally high in the KX91-3’s hydraulic system. | Stop work and inspect hydraulic oil level and condition before continuing. | |
| Air Filter | AMBER | Restriction detected in the KX91-3’s air filter, reducing engine airflow. | Inspect and clean or replace the air filter element. | |
| Fuel Filter / Water Separator | AMBER | Excessive water or clogging detected in the KX91-3’s fuel filter. | Drain water separator and replace fuel filter if needed. | |
| Service / Hour Meter | AMBER | The scheduled maintenance interval has been reached on your KX91-3. | Perform the recommended maintenance as outlined in the operator’s manual. | |
| Work Lights | BLUE | Work lights are currently switched on for the KX91-3’s operation. | No action needed unless lights are not required. | |
| Parking Brake | RED | The parking brake is engaged on the KX91-3. | Release the parking brake before driving the excavator. |
14 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure Warning
Common causes
- Low engine oil level
- Oil pump malfunction
- Oil filter blockage
What to do
Immediately stop the KX91-3, check the oil level, and top up if needed. If the warning remains, inspect for leaks or contact a Kubota service technician.
Hydraulic Oil Warning
Common causes
- Low hydraulic oil level
- Hydraulic fluid overheating
- Filter or line blockage
What to do
Shut down the excavator, check and refill hydraulic oil, and inspect for leaks or clogged filters. Resume operation only when the warning clears.
Coolant Temperature Warning
Common causes
- Low coolant level
- Radiator blockage
- Faulty thermostat
What to do
Turn off the KX91-3, let the engine cool, and check coolant level and radiator condition. Clean debris from the radiator and refill coolant as necessary.
Battery / Charging Warning
Common causes
- Broken or loose alternator belt
- Faulty alternator
- Corroded battery terminals
What to do
Inspect and tighten the alternator belt, clean battery terminals, and replace any faulty charging components to restore proper function.
Frequently Asked Questions
What should I do if the master warning light comes on while operating the KX91-3?
Stop operation immediately, turn off the engine, and investigate all warning lights or messages to identify the specific malfunction.
Can I continue working if the air filter warning light is on?
You should stop to inspect and clean or replace the air filter, as continued operation with a clogged filter can damage the engine.
Why does the glow plug light stay on after starting?
If the glow plug light remains on, the preheat system may be malfunctioning or the temperature sensor could be faulty; have it inspected before further cold starts.
How often should I service the KX91-3 when the hour meter light appears?
Follow the maintenance interval in your operator’s manual, typically every 250 hours for standard service items like oil and filters.
Is it safe to drive with the parking brake light on?
No, operating the KX91-3 with the parking brake engaged can cause brake damage; always release the brake before moving.