Komatsu SAA6D114E-3 - Engine Stops During Operations

40 Troubleshooting SEN00458-01
114E-3 Series
11
S-4 Engine stops during operations 1
*1: Code [559/CA559] and code [2249/CA2249] in E-mode
General causes why engine stops during operations
q Seized parts inside engine
q Insufficient supply of fuel
q There is overheating
q Problem in drive devices on applicable machine side
Carry out troubleshooting for devices on applicable
machine
Causes
Broken dynamic valve system (valve, rocker arm, etc.) Broken, seized piston, connecting rod Broken, seized crankshaft bearing Broken, seized gear train Insufficient fuel in tank Clogged air breather hole of fuel tank cap Leaking, clogged fuel piping Clogging of fuel filter Broken, seized feed pump Broken supply pump shaft Stuck, seized supply pump plunger Broken auxiliary equipment (pump, compressor, etc.) Problem in drive devices on applicable machine side
Questions
Confirm recent repair history
Degree of use of machine Operated for long period E
Condition when engine
stopped
Abnormal noise was heard and engine
stopped suddenly
wwww QwQw w
Engine overheated and stopped wQ Q
Engine stopped slowly wQ
There was hunting and engine stopped wQ QQ
Non-specified fuel is being used QQ Q
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
w
Fuel level monitor indicates low level (if monitor is installed) w
When fuel tank is inspected, it is found to be empty w
Air breather hole of fuel tank cap is clogged w
Fuel is leaking from fuel piping w
Check items
Rust and water are found when fuel tank is drained w
Metal particles are found when oil pan is drained www Q
When engine is cranked by
hand
Does not turn at all ww
Turns in opposite direction w
Moves by amount of gear backlash ww
Supply pump shaft does not turn w
Engine turns, but stops when load is applied to machine w
Troubleshooting
Inspect dynamic valve system directly q
Carry out troubleshooting
on applicable machine
Inspect piston, connecting rod directly q
Inspect crankshaft bearing directly q
Inspect gear train directly q
Inspect fuel filter, strainer directly q
Inspect feed pump directly q
Carry out troubleshooting according to “No-pressure feed by supply pump
(*1)” in E-mode
qq
Engine rotates when pump auxiliary equipment (pump, compressor, etc.) is
removed
q
Remedy
Replace Replace Replace Replace
Add
Clean
Correct
Replace Replace Replace Replace Replace
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