Komatsu HM400-5, Operation & Maintenance Manual

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• When stopping the machine during the normal traveling operation, check that the engine does not hunt or
stop suddenly.
• When the accelerator pedal is depressed, check that the engine speed rises smoothly.
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.
METHOD FOR RUNNING-IN THE NEW MACHINE
NOTICE
Your Komatsu machine has been thoroughly adjusted and tested before shipment. However, operating
the machine under severe conditions at the beginning can adversely affect the performance and short-
en the machine life. Be sure to run in the machine for the initial 100 hours (as indicated by 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.
• Perform warm-up operation for 5 minutes after starting it up.
• Avoid operation with heavy loads or at high speeds.
• Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden
stops, and sudden changes in direction of the machine.
AUTOMATIC WARM-UP FUNCTION
This machine is equipped with the automatic warm-up function.
While the AISS LOW switch is in OFF position or when the engine coolant temperature is low, the low idle
speed is automatically increased to cut down the warm-up time.
REMARK
Turning AISS LOW switch to ON position stop the automatic warm up and decreases the idle speed.
If the engine coolant temperature is low and AISS LOW switch is returned to OFF position within a specific time
after engine is started, the automatic warm-up is resumed.
For AISS LOW switch, see “AISS LOW SWITCH (3-99)”.
NOTICE
When you are forced to urgently cancel the automatic warm-up operation, run the engine at full speed
for 3 seconds, then automatic warm-up operation is canceled.
During KDPF regeneration, the idle speed is set to rather high regardless of the engine coolant tempera-
ture.
METHOD FOR WARM-UP OPERATION
NOTICE
• Do not accelerate the engine sharply during the warm-up operation.
It can shorten the service life of the engine parts.
• Do not continue the low idle or high idle operation for more than 20 minutes.
It does not only adversely affect environment but also cause oil leakage from the turbocharger.
1.
After the engine starts, run it for 5 minutes in the range between low idle and medium speed to warm it up.
MACHINE OPERATIONS AND CONTROLS OPERATION
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