Komatsu Galeo PC850-8 User Manual

PC800, 850-8 13
40 Troubleshooting SEN00795-02
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
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 Clogged fuel filter, strainer Clogged feed pump gauze filter Broken, seized feed pump Broken supply pump shaft, key Stuck, seized supply pump plunger Defective hydraulic pump
Questions
Confirm recent repair history
Degree of use of machine Operated for long period
EE
Condition when engine
stopped
Abnormal noise was heard and engine stopped suddenly
wwww QwQ w
Engine overheated and stopped
wQ
Engine stopped slowly wQQ
There was hunting and engine stopped wQ QQQ
Non-specified fuel is being used
QQQ Q
Replacement of filters has not been carried out according to Operation and Mainte-
nance Manual
ww
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
When priming pump is operated, it makes no reaction or it is heavy
wQQ
Rust and water are found when fuel tank is drained
ww
Metal particles are found when oil is drained
ww QQ
When engine is cranked
by hand
Does not turn at all
ww
Turns in opposite direction w
Moves by amount of gear backlash
w
Supply pump shaft does not turn
w
Troubleshooting
Inspect dynamic valve system directly
q
Carry out troubleshooting in H-mode
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 gauze filter directly
q
Inspect feed pump directly
q
Carry out troubleshooting for “Rail Press (Very) Low Error. (*1)”
See *1 for code.
qq
*1: Failure code [CA559] and [CA2249]
Remedy
Replace Replace Replace Replace Add Clean Correct Clean Clean Replace Replace Replace
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Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English