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MACHINE OPERATIONS AND CONTROLS
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.
This 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 full throttle with no
load for 20 minutes and more. 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 it with 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 the machine under light load until the engine cool-
ant temperature gauge and hydraulic oil temperature
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.
3-156
OPERATION
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