Komatsu PC130-8 User Manual

SEN04125-02 40 Troubleshooting
16 PC130-8
S-7 Exhaust smoke is black (incomplete combustion) 1
*1: Displayed failure codes [CA559] and [CA2249]
*2: Displayed failure codes [CA144] and [CA145]
General causes why exhaust smoke is black
q Insufficient intake of air
q Defective condition of fuel injection
q Improper selection of fuel
q There is overheating
o See “S-14 Coolant temperature becomes too high
(Overheating)“
q Controller is controlling in derate mode
(limiting injection rate (output) because of an error in
electrical system)
Causes
Clogged air cleaner element Seized turbocharger, interference of turbocharger Defective contact of valve and valve seat Improper valve clearance Leakage of air between turbocharger and cylinder head Crushed, clogged muffler Worn piston ring, cylinder Stuck, seized supply pump plunger Clogged, seized injector Abnormally worn injector Improper injection timing Improper fuel injection pressure Defective coolant temperature sensor, wiring harness
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EE EE
Color of exhaust gas is
Suddenly became black w w QQQ
Gradually became black wQQ
Blue under light load w
Non-specified fuel is being used QQ
Oil must be added more frequently w
Power was lost
Suddenly wQQQ
Gradually QQQQ
Dust indicator is red w
Muffler is crushed w
Air leaks between turbocharger and cylinder head, clamp is loosened w
Check items
Engine is operated in low-temperature mode at normal temperature QQQ
When exhaust manifold is touched immediately after starting engine, temperature of some
cylinders is low
Qw
When engine is cranked, interference sound is generated around turbocharger w
When engine is cranked, abnormal sound is generated around cylinder head w
Torque converter stall speed or pump relief speed is high (Fuel is injected excessively) Q
Exhaust noise is abnormal QwQ
Engine does not pick up smoothly and combustion is irregular Q QQQ Qw
Blow-by gas is excessive w
If spill hose from injector is disconnected, abnormally much fuel spills w
Troubleshooting
Inspect air cleaner directly q
When turbocharger is rotated by hand, it is fount to be heavy q
When compression pressure is measured, it is found to be low qq
Inspect valve clearance directly q
When muffler is removed, exhaust sound improves q
Carry out troubleshooting according to “No-pressure feed by supply pump (*1)” indicated by
code
qq
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not change q
Carry out troubleshooting according to “Abnormality in coolant temperature sensor (*2)”
indicated by code
q
Confirm with monitoring function qq
Remedy
Clean
Replace
Correct
Adjust
Correct
Replace Replace Replace Replace Replace Replace Replace Replace

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English