Doosan D35S-5 Service Manual page 90

Unusual noise and
vibration
Intake system
Exhaust system
Turbocharger
D439E Service Manual
Are fixing bolts and nuts of intake system
fastened securely?
Are fixing bolts and nuts of exhaust
system fastened securely
Is exhaust pipe or muffler damaged?
Are bearing and rotating parts
OK?
Yes
Do rotating parts rotate smoothly?
Isn't turbine wheel shaft bent?
Yes
Are there any foreign materials in
turbocharger ?
88
Yes
Yes
No
No
Yes
2. Engine Mechanical System (D439E)
No
Tighten
No
Repair or replace
Yes
Repair or replace
Inspect the following.
• Deterioration of engine oil
• Oil filter element clogging
• Foreign materials in oil
supply pipe.
• Bearing damage due to
repeated sudden
departures and stops.
• Defective bearing
• Compressor wheel or
turbine wheel damage due
to the foreign materials
inside.
Check the intake and
exhaust piper care fully for
the chip of compressor or
turbine wheel