Komatsu PW118MR-11 Operation & Maintenance Manual Download

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When there is an abnormal noise at the engine startup and if that condition continues, the engine may be
damaged. 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

• 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.

• 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 continues,

it may damage the engine or confuse the operator's sense of driving or lower the braking efficiency,
and as a result lead to an unexpected accident. In that case, ask your Komatsu distributor to check the
engine as soon as possible.

REMARK

• The smell of the exhaust gas is different from that of the conventional diesel engine because of the

exhaust gas filtering function.

• Black or white smoke may be discharged for a short time just after the engine is started in the cold

season, but this is not trouble.

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 starting it up.
• Avoid operation with heavy loads or at high speed.
• Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden

stops, and sudden changes in direction of the machine.

METHOD FOR ENGINE WARM-UP OPERATION

NOTICE

• Do not rev the engine abruptly until it has warmed up completely.
• Do not run the engine at low idle or high idle under no load for more than 20 minutes. This will have

an adverse effect on the environment and also on the internal structure of the engine. If it is neces-
sary to run the engine at idle for 20 minutes or more, apply a load from time to time or run at a medi-
um speed.

This machine is equipped with an automatic engine warm-up system that, if the engine coolant temperature is
30 °C or less after the engine is started, starts automatically. When the engine automatic warm-up operation
starts, the engine speed is maintained higher than the normal speed at low idle.
If the engine coolant temperature is 30 °C or above or if the warm-up operation is continued for more than 10
minutes, the automatic warm-up operation is cancelled and the engine speed drops to the normal idle speed.
Do not start operating the machine immediately. First, perform the following operations and checks.
1.

Check that engine coolant temperature caution lamp (1) displays the correct temperature.
If the display indicates low temperature, perform additional warm-up operation of the engine according to
step 2 until it indicates the correct temperature.

Komatsu PW118MR-11, Operation & Maintenance Manual

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