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MACHINE OPERATIONS AND CONTROLS
•
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 perform operations or operate the levers sharp-
ly while the hydraulic oil is at low temperature. Always
perform the warm-up operation until the hydraulic oil
temperature caution lamp shows the green display.
Performing the warm-up operation properly will extend
the service life of the machine.
Do not accelerate the engine abruptly until it is
warmed up.
•
Do not run the engine at low idle or high idle under no
load for more than 20 minutes. This will have an ad-
verse effect on the environment and also on the inter-
nal structure of the turbocharger and engine. If it is
necessary to run the engine at idling, apply a load
from time to time or run at a medium speed.
•
If the engine oil pressure caution lamp on machine
monitor (2) lights up or the alarm buzzer sounds inter-
mittently, stop the engine and perform inspection.
1.
Turn fuel control dial (1) to a position midway between Low
idle (MIN) and High idle (MAX).
The engine runs at a medium speed.
2.
Run under no load (perform warm-up operation) for ap-
proximately 5 minutes.
3.
After the warm-up operation, check that each gauge and
caution lamp indicate the normal values.
If any problem is found, perform maintenance or repair.
4.
Operate under light load until the engine coolant tempera-
ture gauge on machine monitor (2) indicates green range
(A) to (C).
•
(A) to (B): Red range
•
(A) to (C): Green range
•
(C) to (D): White range
5.
Check for abnormal exhaust gas color, noise, or vibration.
If any abnormality is found, contact your Komatsu distribu-
tor.
REMARK
The cooling fan speed varies according to the following conditions, but it is not abnormal.
The cooling fan speed increases when the hydraulic oil temperature , engine coolant temperature, or power
train oil temperature is high.
If the air-conditioner is running, the cooling fan rotates at a higher speed even if these temperature is low.
3-164
OPERATION
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