The Doosan Forklift G20SC-5 is a robust, LPG-powered industrial forklift designed for demanding warehouse and yard operations. Its instrument cluster provides essential warnings and status indicators to help operators maintain safety and maximize uptime. Understanding these lights is key to preventing downtime and ensuring operator safety.
Doosan Forklift G20SC-5 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A major system fault has been detected on your G20SC-5, such as engine or hydraulic failure. | Stop the forklift immediately and investigate the fault before resuming work. | |
| Master Caution | AMBER | The G20SC-5 has detected a non-critical issue that may affect operation if ignored. | Check the display for additional warnings and address them as soon as possible. | |
| Check Engine (MIL) | AMBER | The engine control system has identified a problem affecting emissions or performance. | Continue with caution, but schedule diagnostic service for the engine controller. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped dangerously low, risking severe engine damage. | Shut off the engine right away and check oil level and leaks. | |
| Battery / Charging | RED | The alternator isn’t charging the battery on your G20SC-5. | Inspect the alternator belt and battery connections before further use. | |
| Coolant Temperature | RED | Coolant temperature has exceeded safe limits, risking engine overheating. | Stop the forklift, let the engine cool, and check coolant level. | |
| Transmission Temp | RED | Transmission fluid temperature is too high, which may damage the transmission. | Stop operation and allow the transmission to cool before checking fluid levels. | |
| Brake System | RED | A problem with the G20SC-5’s brake system has been detected. | Do not operate until the brake system is inspected and repaired. | |
| Parking Brake | RED | The parking brake is engaged, preventing movement. | Release the parking brake before attempting to drive. | |
| Seat Belt | AMBER | The operator’s seatbelt is not fastened while the forklift is running. | Fasten the seatbelt to ensure safe operation. | |
| Low Fuel | AMBER | LPG fuel level is low and the forklift will soon require refueling. | Plan to refill the LPG tank soon to avoid unplanned stops. | |
| Service / Hour Meter | AMBER | Scheduled maintenance is due based on engine hours. | Arrange for routine service according to the G20SC-5 maintenance schedule. | |
| Work Lights | GREEN | The front or rear work lights are currently switched on for better visibility. | No action needed unless lights are not required. | |
| Beacon / Rotating Light | AMBER | The safety beacon is activated to alert others of forklift movement. | Ensure the beacon is functioning in busy or low-visibility areas. | |
| Overload / Capacity | RED | The load on the forks exceeds the rated lifting capacity of the G20SC-5. | Lower the load immediately and reduce weight to within safe limits. | |
| Hydraulic System | AMBER | A fault has been detected in the hydraulic system, such as low fluid or pressure. | Inspect hydraulic fluid level and look for leaks or performance loss. | |
| Hydraulic Oil | AMBER | Hydraulic oil level is low, which may affect lifting and steering. | Check and top up hydraulic oil as needed. | |
| Air Filter | AMBER | The air filter is clogged, restricting airflow to the engine. | Clean or replace the air filter to maintain engine performance. | |
| Fuel Filter / Water Separator | AMBER | The fuel filter is restricted or water has been detected in the fuel system. | Drain water and replace the fuel filter if necessary. | |
| Mast / Lift Limit | AMBER | The mast has reached its maximum lift height or limit switch. | Do not attempt to lift beyond the maximum mast height. |
20 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
- Oil leak
What to do
Immediately stop the G20SC-5, check oil level and for leaks, and do not restart until the issue is resolved and oil pressure returns to normal.
Coolant Temperature
Common causes
- Low coolant
- Radiator blockage
- Faulty thermostat
What to do
Turn off the forklift, let the engine cool, check coolant level, and inspect the radiator and thermostat before resuming operation.
Overload / Capacity
Common causes
- Attempting to lift a load above rated capacity
- Incorrect load positioning
- Attachment weight not considered
What to do
Lower the load immediately, ensure the weight is within the G20SC-5’s rated capacity, and reposition or split the load if necessary.
Brake System
Common causes
- Worn brake pads
- Hydraulic brake fluid leak
- Master cylinder failure
What to do
Do not operate the forklift until the brake system is inspected and all faults are repaired by a qualified technician.
Battery / Charging
Common causes
- Loose or corroded battery terminals
- Alternator failure
- Broken alternator belt
What to do
Inspect battery connections and alternator belt; replace or repair faulty components before returning the G20SC-5 to service.
Frequently Asked Questions
What should I do if the Master Warning (Stop) light appears?
Stop the forklift immediately, turn off the engine, and check the display for additional fault information before troubleshooting.
Why does the Overload / Capacity light come on even with a normal load?
If the load is properly within limits, check for incorrect load placement, mast tilt, or faulty sensors that may trigger the overload warning.
How often should I check hydraulic and engine oil levels?
Inspect both hydraulic and engine oil levels daily before starting the G20SC-5 to prevent system damage or operational issues.
Can I continue operating if the air filter warning is on?
You should clean or replace the air filter as soon as possible, as continued operation with a clogged filter can reduce engine power and efficiency.
What maintenance is required when the hour meter/service indicator lights up?
Perform scheduled maintenance such as oil changes, filter replacements, and safety checks according to the G20SC-5 operator’s manual.