Doosan LIGHTSOURCE V9, Operation And Maintenance Manual

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FAULT FINDING
37
LIGHTSOURCE V9
FAULT CAUSE REMEDY
Engine fails to start. Low battery charge. Check the fan belt tension, battery and cable connections.
Bad earth connection. Check the earth cables, clean as required.
Loose connection. Locate and make the connection good.
Fuel starvation. Check the fuel level and fuel system components. Replace the fuel filter if
necessary.
Relay failed. Replace the relay.
Engine starts but stalls
when the switch returns to
Electrical fault Test the electrical circuits.
when the switch returns to
position I .
Low engine oil pressure. Check the oil level and the oil filter(s).
position I .
Faulty relay Check the relays.
Faulty key − switch Check the key − switch.
Engine starts but will not
run or engine shuts down
Electrical fault. Test the electrical circuits.
run or engine shuts down
prematurely.
Low engine oil pressure. Check the oil level and oil filter(s).
prematurely.
Safety shut-down system in
operation.
Check the safety shut-down switches.
Fuel starvation. Check the fuel level and fuel system components. Replace the fuel filter if
necessary.
Switch failure. Test the switches.
Water present in fuel system. Check the water separator and clean if required.
Faulty relay. Check the relay in the holder and replace if necessary.
Engine Overheats. Reduced cooling air from fan. Check the fan and the drive belts. Check for any obstruction inside the cowl.
Engine speed too high. Incorrect throttle arm setting. Check the engine speed setting.
Engine speed too low. Incorrect throttle arm setting. Check the throttle setting.
Blocked fuel filter. Check and replace if necessary.
Blocked air filter. Check and replace the element if necessary.
Excessive vibration. Engine speed too low. See ” Engine speed too low”
Refer also to the engine section of this manual.