G80XW/XF, G115XW/XF, G150XW/XF, G200XW/XF - 50HZ
OPERATION & MAINTENANCE MANUAL
54
G100XW/XF, G135 XW/XF, G170XW/XF, G225XW/XF - 60Hz
3. If color or odor of exhaust gas is unusual during
operation, stop the engine, diagnose the cause and
fix the fault.
4. Check the engine status through the alarm indicator
lamp and gauges mounted on the apparatus during
operation.
OPERATION IN WINTER
COLD START
Periodically check and inspect freezing of coolant and
viscosity of lubrication oil.
PREVENTING COOLANT FROM FREEZING
When only water is used as coolant, without mixing with
antifreeze, corrosion in the engine, degradation of
cooling efficiency, and freezing of the engine in winter
may occur. If the engine is not operated for a long period
during cold weather or in areas with cold climate, fully
drain the coolant from the engine. Freezing of coolant
leads to critical damage to the engine. Use a mixture of
coolant with antifreeze at revised ratio when replacing or
replenishing the coolant. The antifreeze prevents coolant
from freezing.
PREVENTING OVERCOOLING OF THE ENGINE
When the engine is cooled below the normal operating
temperature, thermal efficiency is lowered and fuel
consumption as well as abrasion of the cylinder liner may
increase. Therefore, the engine should be operated
within the normal operating temperature. If the engine
has been sufficiently operated, but the temperature of
coolant remains below the normal operating temperature,
check the water temperature controller or other parts
related to the cooler.
ENGINE OIL
When viscosity of engine oil increases due to its low
temperature during cold weather or in areas with cold
climate, the rpm may not be stable after starting the
engine. To prevent this, replace oil with engine oil for cold
weather or areas with cold climate. When replacing
engine oil, use of Doosan genuine engine oil is
recommended.
INSPECTION AND REPAIR OF THE ENGINE
CHECKING ENGINE PARTS AFTER PROLONGED
OPERATION
Wear, corrosion, or degradation of engine elements and
assemblies may occur, causing lowered performance of
engine parts. To maintain high engine performance,
check the engine after prolonged operation to enhance
durability of the engine.
Unexpected faults may occur in some weak engine parts
after normal operation of the engine, when operation time
is prolonged. In this case, it is difficult to maintain high
engine performance by simply repairing some parts. It is
recommended to replace or repair the entire related parts
in order to diagnose the causes more accurately and
maintain high engine performance.
To prevent engine failure in advance and use the engine
safely for a long period, perform periodic replacements
and inspections.
It is recommended to perform engine adjustments and
preventive inspections during spring after the engine was
exposed to winter or cold weather. This allows economic,
long-term use of the engine without faults.
As the following parts affect the engine output and
performance, they should be regularly checked and
inspected.
1. Parts affecting intake and exhaust:
• Air filter
• Inter cooler
• Turbocharger, Silencer
• Other parts
2. Parts affecting lubrication and cooling:
• Air filter
• Oil filter
• Antifreeze
• Other parts
INSPECTION AND REPAIR OF TURBOCHARGER
As performance of the turbocharger significantly affects
the engine performance, regular inspection and repair
should be made and inspection and maintenance
regulations should be observed.
INTAKE SYSTEM
Be careful to handle the air filter carefully. In regards to
the dry air filter, intake resistance should be small to
ensure a smooth intake of air.
EXHAUST SYSTEM
If exhaust gas is leaked from the connections in the
exhaust pipe, the turbocharger efficiency is lowered,
causing degraded engine output and seizure of related
parts in the worst case. As parts related to exhaust and
turbocharger are used at high temperature, be careful not
to mix the bolts and nuts with other parts when
performing repair.
LUBRICATION SYSTEM
Inspection and exchange of oil and oil filter should be
performed while considering their exchange cycle.
Overheated engine oil significantly affects the engine
performance as well as the engine itself.
