The Komatsu SK815-5 instrument cluster features a comprehensive set of warning lights and gauges to keep you informed of machine status and safety. This compact skid steer loader is equipped with a Tier 4 Final engine, so certain emissions-related indicators are present. Understanding these lights helps maintain productivity and prevent damage.
Komatsu SK815-5 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | Critical system fault detected—stop the engine immediately to prevent serious damage. | Stop the machine, shut off engine, and contact Komatsu dealer for diagnosis. | |
| Master Caution | AMBER | A non-critical warning is present—check the monitor display for details. | View the monitor for specific warning message and address as needed. | |
| Check Engine (MIL) | AMBER | Engine management system detected an abnormality—may affect performance or emissions. | Have the engine system inspected by a Komatsu technician soon. | |
| Engine Oil Pressure | RED | Engine oil pressure is dangerously low—insufficient lubrication. | Stop engine immediately and check oil level; do not operate until resolved. | |
| Battery / Charging | RED | Charging system voltage is too low or battery is not being charged. | Check alternator belt and battery connections; if persists, service charging system. | |
| Coolant Temperature | RED | Engine coolant temperature exceeds safe operating range—risk of overheating. | Stop engine and allow to cool; check coolant level and fan operation. | |
| Hydraulic System | AMBER | Hydraulic system pressure or temperature is abnormal—check for leaks or overheating. | Inspect hydraulic fluid level and condition; reduce load if necessary. | |
| Glow Plug / Preheat | AMBER | Glow plugs are active during cold start preheating; wait for indicator to turn off. | Do not start engine until glow plug indicator goes out. | |
| Seat Belt | RED | Operator seat belt is not fastened—safety interlock prevents operation. | Fasten seat belt securely before starting or moving the machine. | |
| Parking Brake | RED | Parking brake is engaged—machine will not move while light is on. | Release parking brake before attempting to drive. | |
| High Beam | BLUE | High beam headlights are active for enhanced visibility. | Dim when approaching other vehicles or operators. | |
| Work Lights | GREEN | Work lights are turned on for illumination in low-light conditions. | No action needed—lights active. | |
| Beacon / Rotating Light | GREEN | Warning beacon is operating to indicate machine is in use. | No action needed—beacon active. | |
| DPF / Regeneration | AMBER | Diesel particulate filter needs active regeneration to clear soot buildup. | Perform active regeneration per operator manual or allow automatic regen. | |
| DEF / AdBlue | AMBER | Diesel exhaust fluid level is low or system fault—emissions aftertreatment affected. | Refill DEF tank with approved fluid; if light stays, service system. | |
| Water in Fuel | AMBER | Water has accumulated in the fuel water separator—drain immediately. | Drain water from fuel filter bowl or replace filter. | |
| Air Filter | AMBER | Engine air intake restriction is high—air filter may be clogged. | Inspect and replace air filter element as needed. |
17 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
- Faulty radiator fan
- Blocked radiator fins
What to do
Stop engine immediately, let cool, check coolant level and for leaks; clean radiator fins; if persists, have Komatsu dealer check the thermostat and water pump.
Low Engine Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
Shut off engine, check dipstick and add oil if low; if light stays on, do not run engine—call for service; oil filter may need replacement.
Hydraulic System Overheat
Common causes
- Extended heavy use
- Low hydraulic oil
- Contaminated or degraded oil
What to do
Reduce load and let system cool; check hydraulic fluid level and change if needed; inspect for leaks in hoses and cylinders.
DPF Regeneration Required
Common causes
- Accumulated soot from low-load operation
- Faulty regeneration system
- Incorrect idle time
What to do
Perform active regeneration by following the procedure in the operator manual; if light flashes, contact dealer as DPF may be clogged.
Battery Charging Failure
Common causes
- Broken alternator belt
- Faulty alternator
- Loose battery connections
What to do
Check belt tension and condition; inspect alternator wiring; tighten terminals; if light remains, replace alternator.
Frequently Asked Questions
Why is my Check Engine light on after refueling?
If the fuel cap is not tightened properly, the engine management system may detect a vapor leak and illuminate the light. Tighten the cap until it clicks, and the light should turn off after a few starts.
What does the DPF regeneration indicator mean?
It indicates the diesel particulate filter needs to burn off accumulated soot. For the SK815-5, you can perform a parked regeneration by pressing the regen switch after reaching operating temperature.
Can I operate the machine with the Master Warning light on?
No, the Master Warning (Stop) light indicates a serious fault. Operating could cause severe engine or hydraulic damage. Stop the engine and investigate immediately.
How often should I drain the water separator?
Daily during pre-start inspection, or when the Water in Fuel light comes on. Turn the drain valve on the separator bowl and let water drain until fuel appears.
Why does the hydraulic system warning activate when digging?
If hydraulic oil is low or overheated, the warning may activate during heavy loads. Check fluid level and let the system cool; ensure the oil cooler is clean.
What should I do if the glow plug light stays on for more than 10 seconds?
That may indicate a faulty glow plug or relay. Do not crank the engine repeatedly—contact your Komatsu dealer to diagnose the preheating system.