Engine Stops During Operations - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting
S-4 Engine stops during operations
General causes why engine stops during operations
• Seized parts inside engine
• Insufficient supply of fuel
• There is overheating
• Defective hydraulic pump
Confirm recent repair history
Degree of use of
machine
Condition when engine
stopped
Non-specified fuel is being used
Replacement of filters has not been carried out according to Operation and Mainte-
nance Manual
Fuel level monitor indicates low level (if monitor is installed)
When fuel tank is inspected, it is found to be empty
Air breather hole of fuel tank cap is clogged
Fuel is leaking from fuel piping
Rust and water are found when fuel tank is drained
Metal particles are found when oil pan is drained
When engine is cranked
by hand
Engine turns, but stops when load is applied to machine
Inspect dynamic valve system directly
Inspect piston, connecting rod directly
Inspect crankshaft bearing directly
Inspect gear train directly
Inspect fuel filter, strainer directly
Inspect feed pump directly
Carry out troubleshooting for "Rail Press (Very) Low Error." See *1 for failure code.
*1: Failure codes [CA559] and [CA2249]
PC300, 350-8
Operated for long period
Abnormal noise was heard and engine stopped suddenly w w w w
Engine overheated and stopped
Engine stopped slowly
There was hunting and engine stopped
Does not turn at all
Turns in opposite direction
Moves by amount of gear backlash
Supply pump shaft does not turn
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w w w
w w
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w
q
q
q
q
Remedy
SEN02634-02
1
Cause
E
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Q
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Q Q Q
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w
Q
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11