Komatsu PC130-8 User Manual

40 Troubleshooting SEN04125-02
PC130-8
21
S-12 Oil pressure drops 1
General causes why oil pressure drops
q Leakage, clogging, wear or 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
Causes
Worn journal of bearing Lack of oil in oil pan Coolant, fuel in oil Clogged strainer in oil pan Clogged, broken pipe in oil pan Defective oil pump Defective regulator valve Clogged oil filter Leaking, crushed, clogged hydraulic piping Defective oil level sensor, wiring harness
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EEE
Oil pressure monitor indicates low oil pressure Qw
Non-specified oil is being used QQ
Replacement of filters has not been carried out according to Operation and Maintenance
Manual
w
Oil pressure monitor
(if installed)
Indicates pressure drop at low idle w
Indicates pressure drop at low, high idle Q wwwQ
Indicates pressure drop on slopes w
Sometimes indicates pressure drop wQ
Oil level monitor indicates oil level drop ww
Oil level in oil pan is low w
Check items
External hydraulic piping is leaking, crushed w
Oil is milky or smells of diesel oil w
Metal particles are found when oil pan is drained w
Metal particles are found when oil filter is drained wQ
Troubleshooting
Metal particles are found in oil filter q
See S-13
Inspect oil pan strainer, pipe directly qq
Oil pump rotation is heavy, there is play in oil pump q
Valve and spring of regulator valve are fatigued, damaged q
Inspect oil filter directly q
If oil level sensor is replaced, oil level monitor indicates normally q
Remedy
Replace
Add
—
Clean Clean
Replace Replace Replace
Correct
Replace

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English