The Komatsu PC290 is a robust hydraulic excavator designed for demanding construction and earthmoving tasks. Its instrument cluster provides clear, model-specific alerts to help operators maintain machine health and performance in challenging environments.
Komatsu PC290 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical fault has been detected by the PC290’s monitoring system, potentially endangering the machine or operator. | Shut down the engine immediately and investigate the fault code on the monitor. | |
| Master Caution | AMBER | The PC290 has detected a non-critical issue that could impact operation if ignored. | Check the monitor for details and address the indicated issue soon. | |
| Check Engine (MIL) | AMBER | The engine control module has sensed an abnormality in the PC290’s engine management system. | Review the diagnostic code on the display and contact service if necessary. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe limits in the PC290, risking severe engine damage. | Stop the engine immediately and inspect oil level and leaks. | |
| Battery / Charging | RED | The PC290’s charging system is malfunctioning or battery voltage is critically low. | Check alternator belt and battery connections before restarting. | |
| Coolant Temperature | RED | Engine coolant temperature is excessively high, risking overheating in the PC290. | Idle the engine to cool down; check coolant level and radiator for blockages. | |
| Hydraulic System | AMBER | A problem has been detected in the PC290’s hydraulic system, such as low pressure or high temperature. | Monitor hydraulic performance and inspect for leaks or abnormal noises. | |
| Hydraulic Oil | AMBER | Hydraulic oil level or quality is below recommended standards in the PC290. | Check reservoir and top up or replace oil as needed. | |
| Low Fuel | AMBER | Fuel level in the PC290 is nearing empty, risking engine stall during operation. | Refuel at the next opportunity to avoid downtime. | |
| DPF / Regeneration | AMBER | The diesel particulate filter requires regeneration due to soot accumulation in the PC290. | Initiate a parked regeneration cycle as instructed on the monitor. | |
| DEF / AdBlue | AMBER | DEF/AdBlue level is low or quality is inadequate for the PC290’s emission system. | Fill the DEF/AdBlue tank with approved fluid. | |
| Water in Fuel | AMBER | Water has been detected in the PC290’s fuel system, risking injector or pump damage. | Drain the fuel/water separator promptly. | |
| Fuel Filter / Water Separator | AMBER | The fuel filter is clogged or water separator needs attention on the PC290. | Replace the filter or drain water as indicated. | |
| Air Filter | AMBER | Air filter restriction is detected, reducing engine efficiency on the PC290. | Inspect and clean or replace the air filter. | |
| Engine Oil Temperature | RED | Engine oil temperature is abnormally high on the PC290, threatening engine safety. | Stop the machine to let it cool; check oil level and cooling system. | |
| Service / Hour Meter | AMBER | Scheduled service interval has been reached based on PC290 operating hours. | Arrange for scheduled maintenance as soon as possible. | |
| Work Lights | BLUE | Work lights are currently switched on for improved visibility around the PC290. | No action needed unless lights are not required. | |
| Beacon / Rotating Light | BLUE | The rotating beacon is active, signaling machine operation in the work area. | Deactivate the beacon if not needed. | |
| Swing / Slew Lock | AMBER | The swing lock is engaged on the PC290, preventing upper structure rotation. | Disengage the swing lock before operating the boom. | |
| Overload / Capacity | RED | The PC290 is operating beyond safe load limits, risking tipping or structural failure. | Reduce load immediately and reposition the machine. | |
| Door Open | AMBER | A cab access door is open or not securely latched on the PC290. | Close and secure all doors before resuming work. |
21 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure
Common causes
- Oil level too low
- Oil pump malfunction
- Blocked oil filter
What to do
Immediately shut off the engine, verify oil level with the PC290’s dipstick, and inspect for leaks or filter blockages. Only restart after resolving the issue.
Coolant Temperature
Common causes
- Low coolant level
- Radiator blockage
- Cooling fan failure
What to do
Allow the PC290 to idle and cool down, then check coolant reservoir and radiator for obstructions or leaks before resuming work.
Hydraulic System
Common causes
- Hydraulic oil below minimum
- Hydraulic pump malfunction
- Leaking hoses or cylinders
What to do
Check the hydraulic oil level in the reservoir, inspect for visible leaks, and schedule a Komatsu technician if problems persist.
Overload / Capacity
Common causes
- Lifting load beyond rated capacity
- Uneven ground conditions
- Incorrect bucket attachment
What to do
Reduce the load to within the PC290’s rated limits and ensure the excavator is on stable ground before continuing.
Battery / Charging
Common causes
- Loose or corroded battery terminals
- Alternator failure
- Worn alternator belt
What to do
Inspect battery terminals for tightness and cleanliness, check the alternator belt for wear, and replace faulty components as required.
Frequently Asked Questions
What should I do if the DPF regeneration light stays on in my PC290?
If the DPF light remains illuminated, perform a parked regeneration following the instructions on the monitor to clear soot buildup.
Can I keep operating if the hydraulic system warning is amber?
You may continue working briefly, but monitor hydraulic performance and schedule inspection to prevent further issues.
How often should I check the fuel water separator on the PC290?
Inspect and drain the fuel water separator daily or whenever the warning appears to avoid fuel system damage.
Why does the swing lock warning come on when I try to rotate the upper structure?
The swing lock is engaged, preventing rotation for safety; disengage it using the control lever before swinging.
What does it mean if the overload light turns red during lifting?
The PC290 has detected a load above its safe capacity; immediately reduce the load and reposition the machine.