Komatsu 95-2 Series User Manual

12-120 95-2 SERIES
TROUBLESHOOTING S-12
S-12 Oil pressure caution lamp lights up (drop in oil pressure)
General causes why oil pressure lamp lights up
• Leakage, clogging, wear of lubricating system
• Defective oil pressure control
• Improper oil used (improper viscosity)
• Deterioration of oil due to overheating
fl Standards for engine oil selection
Ambient temperature
Type of oil
–22 –4 14 32 50 68 86 104°F
–30 –20 –10 0 10 20 30 40°C
Engine oil
SAE 30
SAE 10W
SAE 15W-40
SAE 10W-30
Confirm recent repair history
Degree of use of machine
Replacement of filters has not been carried out according
to Operation Manual
Caution lamp lights up
Non-specified oil is being used
Condition when oil
pressure lamp lights up
There is clogging, leakage from hydraulic piping (external)
Oil level sensor lamp lights up
When oil level in oil pan is checked, it is found to be low
Metal particles are found when oil is drained
Metal particles are stuck to oil filter element
Oil is cloudy white or smells of diesel oil
Clogged oil filter
Worn bearing, journal
Clogged strainer inside oil pan
Clogged, broken oil pipe inside oil pan
Broken suction pipe brazing
Defective oil pump
Lack of oil in oil pan
Defective regulator valve
Defective main relief valve
Leaking, crushed hydraulic piping
Defective oil level sensor
Defective oil pressure sensor
Water, fuel in oil
QuestionsCheck items
When oil filter is inspected directly, it is found to be clogged
Remove oil pan and inspect directly
Oil pump rotation is heavy, there is play
There is catching of relief valve or regulator valve, spring or
valve guide is broken
When oil level sensor is replaced, oil pressure sensor lamp goes out
When oil pressure is measured, it is found to be within
standard value
Troubleshooting
Carry out troubleshooting for “Oil level rises”.
Clean Clean Clean Clean Correct Replace Add Adjust Adjust Correct Replace Replace
Remedy
Causes
Operated for long period
Lights up at low idling
Lights up at low, high idling
Lights up on slopes
Sometimes lights up
Legend
: Possible causes (judging from Questions and check items)
: Most probable causes (judging from Questions and Check items)
: Possible causes due to length of use (used for a long period)
: Items to confirm the cause.
—
12-120
1

Komatsu 95-2 Series Specifications

General

Brand	Komatsu
Model	95-2 Series
Category	Engine
Language	English