Komatsu D155AX-5 Operation & Maintenance Manual page 191

OPERATION
Problem
Abnormal noise generated (com-
bustion or mechanical)
Monitor displays error code
Alarm buzzer sounds
Engine horsepower lowered sud-
denly
(engine is running in deration
mode)
Main causes
Low grade fuel being used
Overheating
Damage inside muffler
Excessive valve clearance
Please contact your Komatsu distributor
TROUBLESHOOTING
Remedy
Change to specified fuel
See item "Red range of water
temperature gauge flashes".
( Replace muffler)
( Adjust valve clearance)
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