Komatsu PC15MRX-1 Operation And Maintenance Manual page 140

Hydraulic excavator
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TROUBLESHOOTING
Problem
Exhaust gas occasionally turns
black
Combustion noise occasionally
make breathing sound
Abnormal noise generated (com-
bustion or mechanical)
3-86
Main causes
Clogged air cleaner element
Defective nozzle
Defective compression
Defective nozzle
Low-grade fuel being used
Overheating
Damage inside muffler
Excessive valve clearance
OPERATION
Remedy
Clean or replace, see WHEN
REQUIRED
(
Replace nozzle)
(
See defective compression
above)
(
Replace nozzle)
Change to specified fuel
Refer to "Radiator water level
monitor lights up" as above
Replace muffler
(
Adjust clearance)

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