Komatsu Galeo PC800-8 Shop Manual page 846

SEN00795-02
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
• Supply of fuel is extremely small
• Improper selection of fuel (particularly in winter)
Confirm recent repair history
Degree of use of
Operated for long period
machine
Exhaust smoke suddenly stopped coming out (when starting again)
Replacement of filters has not been carried out according to Operation and Main-
tenance 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
If air bleeding plug of fuel filter is removed, fuel does not flow
While engine is
out
cranked with start-
ing motor
If spill hose from injector is disconnected, little fuel spills
When air is bled from fuel system, air comes out
Inspect fuel filter directly
Inspect feed pump gauze filter directly
Inspect feed pump directly
Carry out troubleshooting for "Rail Press (Very) Low Error. (*1)"
See *1 for failure code.
Carry out troubleshooting for "PCV1 Error (*2) or PCV2 Error (*3)."
See *2 or *3 for failure code.
Inspect overflow valve directly
Engine can be started in reduced cylinder mode
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA271] and [CA272]
*3: Failure codes [CA273] and [CA274]
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Remedy
40 Troubleshooting
Causes
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PC800, 850-8