Doosan 9/270 Operation And Maintenance Manual page 62

This item contains a simple troubleshooting. When a failure takes place on your engine, diagnose the cause referring this troubleshooting. Should
the cause of failure not be detected or you are unable to manage the failure, consult your machine supply source or nearest company engine service
outlet.
Engine does not start
Unstable engine running
Engine overheat
Starter does not turn.
Starter turns but engine does not
fire.
Engine fires but stalls
immediately.
Unstable low idling
Engine malfunction in high speed
range.
Engine speed stuck at high idle.
Cooling system defect
Improper servicing
ENGINE TROUBLESHOOTING
Battery discharged
Bad cable connections.
Starter or starter switch failure.
Safety relay failure.
No fuel injection.
Fuel is injected but engine does
not fire.
Air in the fuel system.
Crack in injection pipe.
Injection nozzle failure.
Uneven compression pressure between cylinders.
Insufficient fuel supply.
Uneven fuel injection amount between cylinders.
Incorrect valve clearance adjustment.
Deteriorated valve spring.
Insufficient coolant volume.
Fan belt slippage.
Thermostat malfunction.
Radiator filler cap malfunction.
Cooling system interior fouled.
Radiator clogged.
Engine over-loaded.
Air cleaner element clogged.
Insufficient airflow/restriction.
Restricted coolant flow (high concentration of antifreeze, etc.)
9/270, 9/300, 12/235, 17/235, 21/215, 9/270HA, 9/300HA, 10/300HA, 12/235HA, 17/235HA, 21/215HA
Engine stop solenoid malfunction.
No fuel in the fuel tank.
Clogged fuel filter element.
Air in the fuel system.
Incorrect preheating operation.
Glow plug malfunction.
Incorrect injection timing.
Low cylinder compression
pressure.
Air in the fuel system
Clogged fuel filter element
Piping failure (squeezed/restricted
etc.)
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