Komatsu Galeo PC138US-8 Shop Manual page 760

SEN02469-01
b) Engine turns but no exhaust smoke comes out
General causes why engine turns but no exhaust smoke comes
out
Fuel is not being supplied
q
Supply of fuel is extremely small
q
Improper selection of fuel (particularly in winter)
q
Confirm recent repair history
Degree of use of machine
Exhaust smoke suddenly stopped coming out (when starting again)
Fuel other than specified one is used
Non-specified fuel is being used
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
When fuel tank is inspected, it is found to be empty
Air breather hole of fuel tank cap is clogged
Rust and water are found when fuel tank is drained
When fuel filter is removed, there is not fuel in it
Fuel is leaking from fuel piping
When priming pump is operated, it makes no reaction or it is heavy
While engine is cranked with
starting motor,
When air is bled from fuel system, air comes out
Inspect fuel filter directly
Inspect feed pump directly
Carry out troubleshooting according to "No-pressure feed by supply pump (*1)"
indicated by code
Carry out troubleshooting according to "Abnormality in supply pump IMV (*2)" indicated
by code
Inspect overflow valve directly
Engine can be started in reduced cylinder mode
Fuel flows out when pressure limiter return piping is disconnected
*1: Displayed failure codes [CA559] and [CA2249]
*2: Displayed failure codes [CA271] and [CA272]
10
Operated for long period
If air bleeding plug of fuel filter is removed, fuel does not
flow out
If spill hose from injector is disconnected, little fuel spills
40 Troubleshooting
Causes
E E
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Q E
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Q Q
Q
q
q
Remedy
PC138US, USLC-8
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E Q
E E
w Q
w w w Q
q
q q
q
q
q
q