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40 Troubleshooting
S-12 Oil pressure drops
General causes why oil pressure drops
Leakage, clogging, wear or lubrication system
q
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Defective oil pressure control
q
Selection of oil by the temperature etc. specified in the Operation
and Maintenance Manual is not observed.
q
Deterioration of oil due to overheating
Confirm recent repair history
Degree of use of machine
Oil pressure monitor indicates low oil pressure
Non-specified oil is being used
Replacement of filters has not been carried out according to Operation and Maintenance
Manual
Oil pressure monitor
(if installed)
Oil level monitor indicates oil level drop
Oil level in oil pan is low
External hydraulic piping is leaking, crushed
Oil is milky or smells of diesel oil
Metal particles are found when oil pan is drained
Metal particles are found when oil filter is drained
Metal particles are found in oil filter
Inspect oil pan strainer, pipe directly
Oil pump rotation is heavy, there is play in oil pump
Valve and spring of regulator valve are fatigued, damaged
Inspect oil filter directly
If oil level sensor is replaced, oil level monitor indicates normally
PC130-8
Operated for long period
Indicates pressure drop at low idle
Indicates pressure drop at low, high idle
Indicates pressure drop on slopes
Sometimes indicates pressure drop
SEN04125-02
Causes
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Remedy
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Troubleshooting
