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OPERATION
There are 2 types of warm-up operation: warm-up of the engine and warm-up of the hydraulic component. In
addition, depending on the environment, the method of performing the warm-up operation may differ, so perform
the warm-up operation according to the descriptions given in the appropriate section.
The hydraulic component is not warmed by simply performing the warm-up operation for the engine. Perform
the warm-up operations for the hydraulic component separately from that for the engine. Make sure to perform
the warm-up operation for the hydraulic component, so that the hydraulic oil is also warmed up and it circulates
in all the control circuits.
AUTO-GREASING SYSTEM
Check that the auto-greasing system is operated normally.
For details, see HANDLE AUTO-GREASING SYSTEM (3-114).
METHOD FOR CHECKING STARTING CONDITION AND UNUSUAL NOISE OF
ENGINE
•
When starting the engine, check that the engine causes no abnormal noise and that it starts up easily and
smoothly.
•
Check that there is no abnormal noise when the engine is idling or when the engine speed rises slightly.
When there is an abnormal noise at the engine startup and if that condition continues, the engine may be dam-
aged. In that case, ask your Komatsu distributor to check the engine as soon as possible.
METHOD FOR CHECKING LOW-SPEED RUN AND ACCELERATION OF ENGINE
•
Perform these checks in a safe place, watching out for danger in the surroundings.
•
When the engine performs very badly at low idle and in the acceleration and if that condition contin-
ues, it may damage the engine or confuse the operator's sense of driving or lower the braking effi-
ciency, and as a result lead to an unexpected accident. In that case, ask your Komatsu distributor to
check the engine as soon as possible.
•
When stopping the machine during the normal traveling operation, check that the engine does not hunt or
stop suddenly.
•
Check that the engine speed rises smoothly when the fuel control dial is turned to High idle (MAX) position.
REMARK
•
The smell of the exhaust gas is different from that of the conventional diesel engine because of the exhaust
gas filtering function.
•
White smoke may be discharged for a short time immediately after the engine is started or during the after-
treatment devices regeneration in the cold season, but this is not a failure.
•
When the hydraulic oil temperature is low, the engine speed and engine output at high idle are set to low to
protect the components. When the hydraulic oil temperature becomes proper level, the engine speed and
engine output at high idle are raised and the machine operates normally.
METHOD FOR RUNNING-IN THE NEW MACHINE
NOTICE
Your Komatsu machine has been thoroughly adjusted and tested before shipment from the factory.
However, operating the machine under full load before breaking the machine in can adversely affect the
performance and shorten the machine life.
Be sure to break in the machine for the initial 100 hours (as indicated on the service meter).
Make sure that you fully understand the descriptions in this manual, then run in the machine while paying atten-
tion to the following points.
•
Run the engine at idle for 15 seconds immediately after starting it up.
Do not operate the control levers or fuel control dial during this time.
•
Perform warm-up operation for 5 minutes after the engine is started.
MACHINE OPERATIONS AND CONTROLS
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CAUTION
3-181
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