Oil Becomes Contaminated Quickly - Komatsu Galeo PC800-8 Shop Manual

40 Troubleshooting
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
Confirm recent repair history
Degree of use of
machine
Non-specified fuel is being used
Engine oil must be added more frequently
Even when engine oil temperature rises, oil filter clogging monitor indi-
cates clogging (if monitor is installed)
Metal particles are found when oil is drained
Inside of exhaust pipe is dirty with oil
Engine oil temperature rises quickly
Color of exhaust gas
color
Amount of blow-by gas
Excessive play of turbocharger shaft
When EGR valve is removed, exhaust port is found to be dirty with oil
When compression pressure is measured, it is found to be low
Inspect breather and breather hose directly
Inspect oil cooler directly
Inspect oil filter directly
Spring of oil filter safety valve is hitched or broken
Inspect turbocharger lubrication drain tube directly
PC800, 850-8
Operated for long period
Blue under light load
Black
Excessive
None
Causes
E E E E
Q w
Q Q
w
w
Q Q w
w
q
q
q q
q
Remedy
SEN00795-02
Q
w Q
w
w
w
Q
q
q
q
q
—
19