Oil Becomes Contaminated Quickly - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02634-02
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
Confirm recent repair history
Degree of use of machine
Non-specified fuel is being used
Engine oil must be added more frequently
Metal particles are found when oil filter is drained
Inside of exhaust pipe is dirty with oil
Engine oil temperature rises quickly
Color of exhaust gas
Amount of blow-by gas
Excessive play of turbocharger shaft
When compression pressure is measured, it is found to be low
Check 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
16
Operated for long period
Blue under light load
Black
Excessive
None
40 Troubleshooting
Cause
E E E
Q
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Q Q
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Q Q w
w
q
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Remedy
PC300, 350-8
1
Q
w
w
Q
q
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