Xinchai 490B Series Manual page 41

6.2 Abnormal oil pressure
Cause of trouble
Low oil level and oil viscosity
Broken oil pipeline, leakage
at pipe connection, damaged
oil pressure gauge
Broken pressure regulating
spring
Too big bearing clearance
Loose screw plug
Fault in pressure regulating
valve. Oil return passage
blocked
Too low ambient
temperature or too high oil
viscosity
No oil reaches rocker arm, oil
passage blocked in cylinder
head or in rocker arm
bracket
Contact with Xinchai service
station
remedies
Fill or replace the oil
Weld or replace
Replace
Check and repair
Check and repair
Check and adjust
Pre-warm the engine and use specified oil
Clean and make the oil passage through
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