Komatsu Galeo PC138US-8 User Manual

SEN02469-01 40 Troubleshooting
20 PC138US, USLC-8
S-11 Oil is in coolant (or coolant spurts back or coolant level goes
down) 1
General causes why oil is in coolant
q Internal leakage in lubrication system
q Internal leakage in cooling system
Causes
Broken cylinder head, head gasket Cracks inside cylinder block Holes caused by pitting Broken oil cooler core, O-ring
Questions
Confirm recent repair history
Degree of use of machine Operated for long period
EE
Oil level
Suddenly rose
QQ
Gradually rose QQ
Hard water is being used as coolant QQ
Oil level has risen and oil is milky QQw
Check
items
There are excessive air bubbles in radiator, coolant spurts back w
Trouble-
shooting
Pressure-tightness test of cylinder head shows there is leakage q
Inspect cylinder block, liner directly qq
Pressure-tightness test of oil cooler shows there is leakage q
Remedy
Replace Replace Replace Replace

Komatsu Galeo PC138US-8 Specifications

General

Brand	Komatsu
Model	Galeo PC138US-8
Category	Excavators
Language	English