Doosan 7/26E, Operation And Maintenance Manual

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40 FAULT FINDING
7/26E, 7/31E, 7/41
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 control not in ’run’ position. Check the speed cylinder and stop position.
Engine starts but stalls
when the switch
returns to position
I .
Electrical fault Test the electrical circuits.
Low engine oil pressure. Check the oil level and the oil filter(s).
Faulty relay Check the relays.
Faulty key-switch Check the key-switch.
Engine starts but will
not run or engine shuts
down prematurely.
Electrical fault. Test the electrical circuits.
Low engine oil pressure. Check the oil level and oil filter(s).
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.
High compressor oil temperature. Check the compressor oil level and oil cooler. Check the fan drive.
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.
Faulty regulator valve. Check the regulation system.
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.
Faulty regulator valve. Check the regulation system.
Premature unloading. Check the regulation and the operation of the air cylinder.
Excessive vibration.
Engine speed too low. See ” Engine speed too low”
Refer also to the engine section of this manual.
Air discharge capacity
too low.
Engine speed too low. Check the air cylinder and air filter(s).
Blocked air cleaner. Check the restriction indicators and replace the element(s) if necessary.
High pressure air escaping. Check for leaks.
Incorrectly set regulation system. Reset the regulation system. Refer to SPEED AND PRESSURE
REGULATION ADJUSTMENT in the MAINTENANCE section of this
manual.