Komatsu ecot3 PC300LC-8 Shop Manual page 848

SEN02634-02
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 Mainte-
nance 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
While engine is If air bleeding plug of fuel filter is removed, fuel does not flow out
cranked with start-
If spill hose from injector is disconnected, little fuel spills
ing motor
Inspect fuel filter directly
Inspect feed pump directly
Carry out troubleshooting for "Rail Press (Very) Low Error." See *1 for failure code.
Carry out troubleshooting for "IMV/PCV1 Short (Open) Error." See *2 for failure
code.
Carry out troubleshooting for "Power Lift Pump Error." See *3 for failure code.
Inspect overflow valve directly
Engine can be started in reduced cylinder mode.
If pressure limiter return pipe is disconnected, fuel flows out
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA271] and [CA272]
*3: Failure codes [CA2265] and [CA2266]
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Remedy
40 Troubleshooting
Cause
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PC300, 350-8