Oil Pressure Drops - Komatsu Galeo PC800-8 Shop Manual

SEN00795-02
S-12 Oil pressure drops
General causes why oil pressure drops
• Leakage, clogging, wear in lubrication system
• Defective oil pressure control
• Improper selection of fuel (improper viscosity)
• Deterioration of oil due to overheating
Confirm recent repair history
Degree of use of
Operated for long period
machine
Oil pressure monitor indicates low oil pressure (if monitor is installed)
Non-specified oil is being used
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
Indicates pressure drop at low idle
Oil pressure
Indicates pressure drop at low, high idle
monitor
Indicates pressure drop on slopes
(if installed)
Sometimes indicates pressure drop
Oil level monitor indicates oil level drop (if monitor is installed)
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 oil pump relief valve are fatigued, damaged
Inspect oil filter directly
Relief valve of EGR oil pump is damaged, oil leaks from it
Inspect EGR hydraulic piping directly
Carry out troubleshooting for "Eng Oil Press Sensor High (Low) Error. (*1)"
See *1 for failure code
If oil level sensor is replaced, oil pressure monitor indicates normally
*1: Failure codes [CA135] and [CA141]
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Remedy —
40 Troubleshooting
Causes
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PC800, 850-8