The Komatsu SK820-5 instrument cluster provides critical machine status through a combination of analog gauges and multi-function LCD. Designed for loader and backhoe operations, it monitors engine, hydraulic, and electrical systems to ensure maximum uptime.
Komatsu SK820-5 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault detected on the SK820-5 that requires immediate engine shutdown to prevent damage. | Stop the engine and contact Komatsu dealer support. | |
| Master Caution | AMBER | A non-critical warning light on the SK820-5, indicating that one or more systems need attention soon. | Check the LCD display for fault codes and schedule service if persistent. | |
| Check Engine (MIL) | AMBER | Engine electronic control system has logged a fault code on the SK820-5, which may affect performance or emissions. | Read engine fault codes using the diagnostic mode; contact your dealer if the light stays on. | |
| Engine Oil Pressure | RED | Engine oil pressure is below safe minimum on the SK820-5, risking serious engine damage. | Stop the engine immediately and check oil level; if okay, do not restart – call for service. | |
| Battery / Charging | RED | Alternator not charging properly or battery voltage is low on the SK820-5 electrical system. | Check battery connections and alternator belt; if light remains, have electrical system tested. | |
| Coolant Temperature | RED | Engine coolant exceeds normal operating range on the SK820-5, risk of overheating. | Stop the engine, let it cool, check coolant level and radiator for blockages. | |
| Transmission Temp | AMBER | Transmission/hydraulic fluid temperature is high on the SK820-5; reduce load until light goes out. | Shift to low range or park and idle to cool down; if persistent, check fluid levels. | |
| Parking Brake | RED | Parking brake is engaged on the SK820-5; machine will not move until released. | Release parking brake before operating; if light stays off, brake switch may need adjustment. | |
| Glow Plug / Preheat | AMBER | Glow plugs are heating on the SK820-5 diesel engine; wait for light to go out before starting. | Turn key to preheat position and wait; if light fails, check glow plug relay. | |
| Water in Fuel | AMBER | Water has accumulated in the fuel filter/water separator of the SK820-5; drain promptly. | Drain water from the fuel separator bowl; if light persists, replace filter and prime system. | |
| Low Fuel | AMBER | Fuel level is low on the SK820-5; refill soon to avoid air in system. | Add diesel fuel; do not run tank dry to prevent priming issues. | |
| Hydraulic System | AMBER | Hydraulic system issue detected on the SK820-5, such as low fluid or high temperature. | Check hydraulic oil level and temperature; if lamp stays on, inspect for leaks. | |
| Fasten Seat Belt | RED | Operator seat belt not fastened on the SK820-5; machine functions may be limited. | Fasten your seat belt; if light remains, check seat belt switch. | |
| Air Filter | AMBER | Engine air filter is clogged on the SK820-5, reducing air flow and power. | Clean or replace engine air filter element as soon as possible. | |
| Service / Hour Meter | GREEN | Scheduled service interval reminder on the SK820-5; appears at preset hours. | Perform required maintenance per operator's manual; reset after service. | |
| Work Lights | BLUE | Work lights are switched on for the SK820-5, improving visibility in low-light conditions. | None – indicates normal operation; turn off when not needed to save battery. | |
| Beacon / Rotating Light | GREEN | Rotating beacon is active on the SK820-5, signaling machine is in operation. | None – keep beacon on when machine is moving; turn off if stationary for long periods. | |
| Swing / Slew Lock | AMBER | Swing lock pin is engaged on the SK820-5 backhoe attachment; upper structure cannot rotate. | Release swing lock before operating backhoe swing function. | |
| Differential Lock | GREEN | Differential lock is engaged on the SK820-5 for maximum traction in soft ground. | Disengage differential lock when on hard surfaces to avoid drive line damage. |
19 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
- Failed thermostat
What to do
Stop the SK820-5 immediately. Check coolant level when cool, clean radiator fins of debris. If persistent, inspect thermostat and water pump – contact Komatsu dealer.
Hydraulic System Failure
Common causes
- Low hydraulic oil
- Contaminated fluid
- Failed pump
What to do
Check hydraulic oil level and condition on the SK820-5; prime system if necessary. If light stays on, do not operate – have dealer test pump pressure.
Fuel System Water Contamination
Common causes
- Water in fuel tank
- Dirty fuel
- Faulty water separator
What to do
Drain water from the fuel filter bowl on the SK820-5. Replace fuel filter and fill with clean diesel; if light repeats, inspect fuel tank for water ingress.
Engine Oil Pressure Loss
Common causes
- Low oil level
- Oil pump failure
- Worn bearings
What to do
Shut off the SK820-5 engine. Verify oil level and condition; if adequate, do not restart – internal damage likely, contact dealer for diagnosis.
Frequently Asked Questions
Why does my SK820-5 show a master caution and a hydraulic system light together?
The SK820-5 master caution accompanies any secondary warning. The hydraulic light suggests low fluid or temperature; check hydraulic oil level and look for leaks. If both persist, a sensor may need replacement.
How do I reset the service hour meter light on the SK820-5?
After performing the required maintenance, turn the key to ON, then press and hold the mode/reset button on the instrument cluster for 5 seconds until the light turns off.
The glow plug light stays on after starting the SK820-5 – what should I do?
If the glow plug light remains on with engine running, it indicates a preheat system fault. Check glow plug relay and wiring; replace any failed glow plugs. Avoid prolonged cranking.
What does the amber transmission temperature light mean on the SK820-5?
It warns that transmission or hydraulic fluid is too hot. Reduce load immediately – shift to low range or park and idle. If light persists, check fluid level and cooler for blockage.
How can I check fault codes on the SK820-5 LCD display?
Turn key to ON and the LCD will show active warnings. For stored codes, press and hold the 'menu' and 'set' buttons simultaneously for 3 seconds; the display will cycle through fault codes.