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Operation 3.7 Troubleshooting

WA470-6H – VEAM946100 3-177

Exhaust gas occasionally turns

black

! Clogged air cleaner element

! Defective nozzle

! Defective compression

! Defective turbocharger

! Clean or replace.

See WHEN REQUIRED

! (Replace nozzle)

! (See defective compression

above)

! Clean or replace turbocharger

Combustion noise occasionally

makes breathing sound

! Defective nozzle ! (Replace nozzle)

Abnormal noise generated

(combustion or mechanical)

! Low grade fuel being used

! Overheating

! Damage inside muffler

! Excessive valve clearance

! Change to specified fuel

! Refer to “Water temperature

gauge is in red range“ as above

! (Replace muffler)

! (Adjust valve clearance)

Problem Main causes Remedy

Komatsu WA470-6 2006 User Manual

Questions and Answers: