The Komatsu SK1020-5 skid steer loader features a comprehensive instrument cluster with warning and indicator lights to monitor machine health and operational status. This guide explains the meaning of each light and provides specific actions to take for the SK1020-5.
Komatsu SK1020-5 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A serious fault has been detected that requires immediate engine shutdown to prevent damage to the Komatsu SK1020-5. | Stop the engine immediately, investigate the cause, and contact your Komatsu dealer. | |
| Master Caution | AMBER | A non-critical system issue or maintenance reminder is active on your SK1020-5; check the monitor for details. | Refer to the multifunction display for specific fault codes and schedule service soon. | |
| Check Engine (MIL) | AMBER | The engine control module has detected a fault in the emission or fuel system of your SK1020-5. | Have the engine diagnostics checked by a Komatsu technician as soon as possible. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe operating level on your SK1020-5, risking severe engine damage. | Stop the engine immediately and check the oil level and pressure sensor. | |
| Battery / Charging | RED | The alternator is not charging the battery properly; the electrical system voltage is low on your SK1020-5. | Check alternator belt tension and battery connections; if persistent, have the charging system inspected. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded the normal range on your SK1020-5, risking overheating. | Stop the engine, let it cool, and check coolant level and radiator for obstructions. | |
| Hydraulic System | AMBER | The hydraulic system temperature or pressure is abnormal on your SK1020-5, affecting loader performance. | Reduce load and allow the hydraulic system to cool; check hydraulic oil level and filter. | |
| Parking Brake | AMBER | The parking brake is engaged on your SK1020-5; release before moving. | Release the parking brake lever before operating the machine. | |
| Seat Belt | RED | The operator's seat belt is not fastened; fasten for safety on your SK1020-5. | Fasten the seat belt before operating the machine. | |
| Low Fuel | AMBER | The fuel level in your SK1020-5 is low; refuel soon to avoid running out. | Add diesel fuel, ensuring the fuel cap is tightened securely. | |
| Glow Plug / Preheat | AMBER | The glow plugs are preheating the engine for cold start on your SK1020-5; wait for the light to go out. | Turn the key to 'ON' and wait for the glow plug light to turn off before cranking. | |
| Work Lights | GREEN | The auxiliary work lights are turned on for visibility on your SK1020-5. | No action needed; indicator confirms work lights are active. |
12 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 blockage
- Faulty cooling fan
What to do
Stop the engine on your SK1020-5, check coolant level after cooling, and clean the radiator fins. If recurring, inspect the thermostat and fan clutch.
Hydraulic System Overheating
Common causes
- Excessive load or continuous high-speed operation
- Low hydraulic oil level
- Clogged hydraulic oil filter
What to do
Reduce load and let the system cool on your SK1020-5. Check hydraulic oil level and replace the filter if needed.
Electrical System Failure
Common causes
- Loose or corroded battery terminals
- Faulty alternator
- Broken alternator belt
What to do
Check battery connections and alternator belt tension on your SK1020-5. Test the alternator output and replace if defective.
Frequently Asked Questions
What should I do if the Master Warning (Stop) light comes on?
Immediately stop the engine of your SK1020-5 to prevent damage. Investigate the cause (e.g., check oil pressure, coolant temperature) and contact your Komatsu dealer for further diagnosis.
Why does the Check Engine light stay on after starting?
The light indicates a fault in the engine management system. On the SK1020-5, it could be due to a sensor issue or emission system problem. Have the diagnostic codes read by a technician.
How do I interpret the Master Caution light?
The amber Master Caution on your SK1020-5 means a non-critical warning exists. Check the multifunction display for specific messages and schedule service as recommended.
What does the hydraulic oil light indicate?
It signals abnormal hydraulic system conditions like high temperature or low pressure. Reduce load on your SK1020-5, check hydraulic oil level, and ensure the filter is clean.
Can I operate the SK1020-5 with the fuel low light on?
You can continue briefly, but refuel soon to avoid running out of diesel. Low fuel can cause air ingestion and damage the injection system of your SK1020-5.
Why does the glow plug light come on in warm weather?
The glow plug system on the SK1020-5 may activate briefly even in warm conditions to ensure clean starts. If it stays on for more than a few seconds, have the system checked.