Komatsu Galeo PC850-8 User Manual

PC800, 850-8 19
40 Troubleshooting SEN00795-02
S-9 Oil becomes contaminated quickly
General causes why oil becomes contaminated quickly
• Entry of exhaust gas into oil due to internal wear
• Clogging of lubrication passage
• Use of improper fuel
• Use of improper oil
• Operation under excessive load
Causes
Defective turbocharger turbine side seal Worn EGR valve guide Worn valve, valve guide Worn piston ring, cylinder liner Clogged breather, breather hose Clogged oil cooler Clogged oil filter Defective oil filter safety valve Clogged turbocharger lubrication drain tube Exhaust smoke is bad
Questions
Confirm recent repair history
Degree of use of
machine
Operated for long period
EEEE
Non-specified fuel is being used
Q
Engine oil must be added more frequently
Qw
Even when engine oil temperature rises, oil filter clogging monitor indi-
cates clogging (if monitor is installed)
wQ
Metal particles are found when oil is drained
QQ w
Inside of exhaust pipe is dirty with oil
w
Engine oil temperature rises quickly
w
Check items
Color of exhaust gas
color
Blue under light load
w
Black
w
Amount of blow-by gas
Excessive
QQw Q
None
w
Troubleshooting
Excessive play of turbocharger shaft
q
See S-7
When EGR valve is removed, exhaust port is found to be dirty with oil
q
When compression pressure is measured, it is found to be low
qq
Inspect breather and breather hose directly
q
Inspect oil cooler directly
q
Inspect oil filter directly
q
Spring of oil filter safety valve is hitched or broken
q
Inspect turbocharger lubrication drain tube directly
q
Remedy
Replace Replace Replace Replace Clean Clean Replace Replace Clean
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Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English