Doosan 12/154, Operation & Maintenance Manual

Page: 97 / 108

FAULT FINDING 93
12/154
FAULT CAUSE REMEDY
No reaction from
instrument panel when
key
turned to (
I)
position.
Batteries not connected. Connect batteries.
Fuse at starter motor ‘blown’. Replace fuse.
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.
Faulty stop solenoid. Check the stop solenoid.
Engine stops while in
service or is reluctant
to start. Low fuel level. Fill fuel tank and bleed air from fuel system if necessary. (Refer to
MAINTENANCE SECTION ).
Safety shut-down system in
operation.
Check the safety shut-down switches.
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 relays and replace if necessary.
Engine Overheats. Low water level. Check the level and replenish if necessary.
Blocked radiator. Stop the machine and clean the cooling fins with compressed air or steam.
Use reduced pressure for cleaning the fins.
Reduced cooling air from fan. Check the fan and the drive belts. Check for any obstruction inside the cowl.
Faulty thermostat. Check the thermostat and replace if necessary.
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.
Incorrectly set regulation system. Reset the regulation system. Refer to SPEED AND PRESSURE
REGULATION ADJUSTMENT in the MAINTENANCE section of this manual.
Premature unloading. Check the regulation system.
Excessive vibration. Engine speed too low. See ” Engine speed too low”.
Leaking oil seal. Improperly fitted oil seal. Replace the oil seal.
Refer also to the Engine Manufacturer’s Manual.