Oil Pressure Drops - Komatsu PC200-8M0 Shop Manual

600 Troubleshooting of engine (S-mode)
S-12 Oil pressure drops
S-12 Oil pressure drops
General causes why oil pressure drops
q Leakage, clogging, or wear on lubrication system
q
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
Check recent repair history.
Machine opera-
Operated for long period
tion hours
Oil pressure monitor indicates low oil pressure.
Oil other than specified one is used
Filters are not replaced as indicated in the Operation and Maintenance Manual.
Indicates pressure drop at low idle.
Oil pressure
Indicates pressure drop at low and high idle.
monitor:
Indicates pressure drop on slope.
(if installed)
Sometimes indicates pressure drop.
Oil pressure monitor indicates low oil pressure.
Oil level in oil pan is low.
External lubrication piping is leaking or crushed.
Oil is milky or smells of diesel fuel.
Metal particles are found in oil drained from oil pan.
Metal particles are found in the removed oil filter.
Metal particles are found in oil filter.
Inspect oil pan strainer and pipe.
Oil pump rotation is heavy or there is play in oil pump.
Valve and spring of regulator valve are fatigued or damaged.
Check oil filter.
If oil level sensor is replaced, oil level monitor indicates correct oil level.
PC200, 200LC, 220, 220LC-8M0
SEN06140-00
Cause
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Remedy
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19
40-600