The Komatsu SK820 skid steer loader features a digital instrument cluster that provides critical machine health and operational status. Understanding these indicators is essential for safe operation and preventing costly downtime.
Komatsu SK820 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | Indicates a critical system fault that requires immediate engine shutdown on the SK820. | Stop the engine immediately and consult the operation manual. | |
| Master Caution | AMBER | Illuminates to alert the operator of a non-critical system issue requiring attention on the SK820. | Check the display for related warnings and service as needed. | |
| Check Engine (MIL) | AMBER | The engine control module has detected a fault, often related to emissions or fuel system on the SK820. | Have the engine diagnosed by a Komatsu dealer. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe operating level, risking engine damage on the SK820. | Stop engine immediately, check oil level and leakages. | |
| Battery / Charging | RED | The alternator is not charging the battery, or voltage is too low for the SK820 electrical system. | Check alternator belt and connections; recharge or replace battery. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded normal range, indicating overheating on the SK820. | Stop engine and allow to cool; check coolant level and fan. | |
| Transmission Temp | AMBER | Transmission fluid temperature is high, which may degrade performance on the SK820. | Reduce load and allow transmission to cool; check fluid level. | |
| Hydraulic Oil | RED | Hydraulic oil temperature is too high or pressure is low, affecting the SK820 lift and tilt functions. | Stop operation, check hydraulic oil level and cooler. | |
| Low Fuel | AMBER | Fuel level is low, requiring refueling soon to avoid engine shutdown on the SK820. | Refill the fuel tank with clean diesel. | |
| Seat Belt | RED | The operator seat belt is not fastened, which must be done for safe machine operation. | Fasten your seat belt before moving the SK820. | |
| Glow Plug / Preheat | AMBER | Glow plugs are heating for cold start; wait for the light to turn off before cranking the SK820. | Wait until the indicator goes out, then start the engine. | |
| Air Filter | AMBER | Engine air filter is clogged, reducing airflow and engine efficiency on the SK820. | Replace or clean the air filter element. | |
| Fuel Filter / Water Separator | AMBER | Water has accumulated in the fuel filter/separator, which can cause injection issues on the SK820. | Drain water from the fuel separator and replace fuel filter if needed. | |
| Service / Hour Meter | AMBER | Indicates scheduled maintenance is due based on engine hours on the SK820. | Perform the required service as outlined in the maintenance schedule. | |
| Work Lights | GREEN | The work lights are turned on, providing illumination for the job site. | No action needed; switch off when not required to conserve battery. | |
| Beacon / Rotating Light | GREEN | The beacon light is active, indicating the machine is in operation for safety. | No action; ensure beacon operates correctly per site regulations. |
16 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Master Warning (Stop) Activation
Common causes
- Low engine oil pressure
- High coolant temperature
- Charging system failure
What to do
Shut down the SK820 immediately. Check the specific cause via the diagnostic display. Add oil if low, inspect for coolant leaks, or test the alternator. Contact a Komatsu technician if the issue persists.
Engine Overheating
Common causes
- Coolant leak
- Faulty thermostat
- Clogged radiator
What to do
Stop the SK820 and let the engine cool. Check coolant level and top off with proper mixture. Clean debris from radiator fins. If overheating repeats, inspect the water pump and thermostat.
Hydraulic System High Temperature
Common causes
- Low hydraulic oil
- Blocked hydraulic cooler
- Overloading the system
What to do
Reduce load on the hydraulic system. Check hydraulic oil level and add if needed. Clean the cooler fins. Allow the system to cool before resuming heavy work.
Transmission Overheating
Common causes
- Low transmission fluid
- Excessive load
- Faulty transmission oil cooler
What to do
Park the SK820 in a safe area and idle to cool. Check transmission fluid level and condition. Inspect the cooler for blockages. If warning persists, consult the service manual.
Battery/Charging System Failure
Common causes
- Loose or corroded battery terminals
- Failed alternator
- Damaged wiring
What to do
Check battery connections for tightness and corrosion. Measure voltage with the engine running (should be ~14V). If low, replace alternator or repair wiring. Charge battery if necessary.
Frequently Asked Questions
What should I do if the Master Warning light comes on while operating the SK820?
Immediately stop the engine and assess the situation. Do not restart until the underlying issue is resolved, as it indicates a critical fault that could cause severe damage.
Why is my air filter indicator on and can I still use the machine?
The air filter indicator signals a clogged filter. While you may still operate, reduced airflow can lower engine power and increase fuel consumption. Replace the filter as soon as possible.
How often should I check the fuel filter/water separator on the SK820?
Drain the water separator daily, especially in humid conditions. Replace the fuel filter at every 250-hour service interval to prevent injector fouling.
The Glow Plug indicator stays on longer than usual; is this normal?
Extended glow time can occur in very cold temperatures. If it stays on for more than 15 seconds in normal weather, have the glow plug system inspected to ensure reliable starting.
My low fuel light flickers but the gauge shows half full; is there a problem?
A flickering light often indicates a faulty sending unit or loose connection. Check the fuel level manually. If inaccurate, have the gauge and sensor tested by a service tech.
What does the Hydraulic Oil warning light mean and how do I respond?
It warns of high oil temperature or low pressure. Stop operating and let the hydraulics cool. Check the oil level and add Komatsu hydraulic oil if low. If the light stays on, inspect for leaks or pump issues.