The Komatsu PC200 is a popular hydraulic excavator known for its reliability and advanced monitoring systems. Its instrument cluster provides critical information to operators, ensuring safe and efficient operation in demanding work environments.
Komatsu PC200 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A major fault has occurred in a critical system on the PC200, such as engine or hydraulic failure. | Shut down the excavator safely and investigate the specific cause via the diagnostic display. | |
| Master Caution | AMBER | The PC200 has detected a non-critical issue that may escalate if ignored, such as a sensor fault. | Review the monitor for more details and address the caution as soon as possible. | |
| Check Engine (MIL) | AMBER | Engine management on the PC200 has identified an abnormality affecting performance or emissions. | Check diagnostic codes using the monitor and arrange for service if needed. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe limits, risking severe engine damage. | Stop the engine immediately and check oil level and for leaks before restarting. | |
| Battery / Charging | RED | The PC200's charging system is not functioning, causing battery voltage to drop. | Inspect the alternator, drive belt, and battery connections before resuming work. | |
| Coolant Temperature | RED | The engine coolant temperature is excessive, risking engine overheating on the PC200. | Turn off the engine and allow it to cool; check coolant level and radiator for obstructions. | |
| Hydraulic System | AMBER | A fault has been detected in the hydraulic system, such as low pressure or filter clogging. | Inspect hydraulic fluid level and filters; arrange for maintenance if the issue persists. | |
| Hydraulic Oil | AMBER | Hydraulic oil level is low or the oil temperature is too high for safe operation. | Check and top up hydraulic oil; inspect for leaks or overheating components. | |
| Low Fuel | AMBER | The PC200's fuel tank is nearing empty, which may interrupt operation soon. | Refuel the excavator at the next opportunity. | |
| Water in Fuel | AMBER | Water has been detected in the fuel system, which can cause injector or pump damage. | Drain the water separator and inspect the fuel system for contamination. | |
| Air Filter | AMBER | The air filter element on the PC200 is clogged, restricting airflow to the engine. | Clean or replace the air filter promptly to prevent power loss. | |
| Fuel Filter / Water Separator | AMBER | The fuel filter requires service due to blockage or water accumulation. | Replace the fuel filter and drain the water separator as soon as possible. | |
| DPF / Regeneration | AMBER | The diesel particulate filter is full and regeneration is required to maintain exhaust flow. | Initiate the regeneration process according to the PC200’s manual. | |
| DEF / AdBlue | AMBER | The DEF (AdBlue) level is low, which can cause the PC200 to enter reduced power mode. | Refill the DEF tank with the appropriate fluid. | |
| Engine Oil Temperature | RED | Engine oil temperature is dangerously high, risking engine lubrication failure. | Stop the engine and allow it to cool; check oil level and look for cooling system issues. | |
| Service / Hour Meter | AMBER | Scheduled maintenance is due based on the PC200's operating hours. | Perform required service tasks as indicated in the maintenance schedule. | |
| Work Lights | BLUE | The PC200’s work lights are currently switched on for better visibility. | No action required unless lighting is not needed. | |
| Beacon / Rotating Light | BLUE | The rotating beacon is active, alerting others to the PC200’s operation. | Deactivate when no longer needed for site safety. | |
| Parking Brake | RED | The parking brake is engaged, preventing the PC200 from moving. | Release the brake before attempting to drive. | |
| Swing / Slew Lock | AMBER | The swing lock is engaged, restricting upper structure rotation. | Disengage the swing lock before rotating the house. | |
| Overload / Capacity | RED | The PC200 is lifting beyond its rated capacity, risking instability. | Lower the load immediately to a safe level. |
21 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Blocked oil filter
What to do
Immediately stop the PC200, check and top up engine oil, and inspect for leaks or faulty oil pump before restarting.
Coolant Temperature
Common causes
- Coolant loss
- Radiator blockage
- Faulty thermostat
What to do
Turn off the engine, allow it to cool, inspect coolant level, and clean the radiator or replace faulty components as needed.
Hydraulic System Warning
Common causes
- Low hydraulic oil
- Clogged hydraulic filter
- Hydraulic pump malfunction
What to do
Check hydraulic oil level, replace the filter if needed, and have the hydraulic system inspected by a Komatsu technician.
Overload Warning
Common causes
- Lifting load above rated capacity
- Incorrect lifting position
- Faulty load sensor
What to do
Lower the load to within the PC200's rated limits and verify load sensor functionality before resuming lifting.
Battery / Charging System
Common causes
- Alternator failure
- Loose battery connections
- Drive belt damage
What to do
Inspect the alternator, tighten connections, and replace the belt if worn to restore proper charging.
Frequently Asked Questions
Why does my PC200 display a hydraulic system warning even after topping up the oil?
If the warning persists, the hydraulic filter may be clogged or there could be a deeper issue like a failing pump or sensor—have a technician perform a diagnostic check.
What should I do if the DPF regeneration light stays on?
Follow the regeneration procedure in the operator’s manual; if the light does not go out, contact your Komatsu service center.
Can I operate the PC200 with the swing lock engaged?
No, the swing lock restricts upper structure rotation and must be disengaged before rotating or swinging the house.
What happens if I ignore the master warning light?
Ignoring the master warning can lead to severe machine damage or unsafe conditions; always stop and investigate immediately.
How often should I replace the air and fuel filters on the PC200?
Replace filters at intervals recommended in the maintenance manual, or sooner if the indicator lights show clogging or contamination.