Komatsu 80001 User Manual

SEN04125-02 40 Troubleshooting
10 PC130-8
*1: Displayed failure codes [CA559] and [CA2249]
*2: Displayed failure codes [CA271] and [CA272]
b) Engine turns but no exhaust smoke comes out
General causes why engine turns but no exhaust smoke comes
out
q Fuel is not being supplied
q Supply of fuel is extremely small
q Improper selection of fuel (particularly in winter)
Causes
Use of improper fuel Insufficient fuel in tank Clogged air breather hole of fuel tank cap Leaking or clogged fuel piping, entry of air Clogged fuel filter Seized, abnormally worn feed pump Broken supply pump shaft Stuck, seized supply pump plunger Defective supply pump MPROP Defective operation of overflow valve (Does not close) Defective common rail pressure limiter Defective fuel injector
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EE
Exhaust smoke suddenly stopped coming out (when starting again) wQww E
Fuel other than specified one is used w
Non-specified fuel is being used w
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
wE Q
When fuel tank is inspected, it is found to be empty w
Air breather hole of fuel tank cap is clogged w
Rust and water are found when fuel tank is drained QE EE
Check items
When fuel filter is removed, there is not fuel in it ww
Fuel is leaking from fuel piping w
When priming pump is operated, it makes no reaction or it is heavy wQ
While engine is cranked with
starting motor,
If air bleeding plug of fuel filter is removed, fuel does not
flow out
QQwQ
If spill hose from injector is disconnected, little fuel spills Q www Q
Troubleshooting
When air is bled from fuel system, air comes out q
Inspect fuel filter directly q
Inspect feed pump directly q
Carry out troubleshooting according to “No-pressure feed by supply pump (*1)”
indicated by code
qq
Carry out troubleshooting according to “Abnormality in supply pump IMV (*2)” indicated
by code
q
Inspect overflow valve directly q
Engine can be started in reduced cylinder mode q
Fuel flows out when pressure limiter return piping is disconnected q
Remedy
Replace
Add
Clean
Correct
Replace Replace Replace Replace Replace Replace Replace Replace

Komatsu 80001 Specifications

General

Brand	Komatsu
Model	80001
Category	Excavators
Language	English