Komatsu Galeo PC138US-8 Shop Manual page 761

40 Troubleshooting
c) Exhaust smoke comes out but engine does not start
(fuel is being injected)
General causes why exhaust smoke comes out but engine does
not start
Lack of rotating force due to defective electrical system
q
Insufficient supply of fuel
q
Insufficient intake of air
q
Improper selection of fuel
q
Confirm recent repair history
Degree of use of machine
Suddenly failed to start
Non-specified fuel is being used
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
Oil must be added more frequently
When engine is preheated or when temperature is low, preheating monitor does not
indicate normally
Dust indicator is red
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
Starting motor cranks engine slowly
When engine is cranked, abnormal sound is generated around cylinder head
While engine is cranked with
starting motor,
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low
Inspect air cleaner directly
Inspect dynamic valve system directly
When compression pressure is measured, it is found to be low
When air is bled from fuel system, air comes out
Inspect fuel filter directly
Carry out troubleshooting according to "No-pressure feed by supply pump (*1)" indicated
by code
Engine can be started in reduced cylinder mode
When specific gravity of electrolyte and voltage of battery are measured, they are low
Coolant temperature gauge does not indicate normally
When starting switch is turned to HEAT, intake air heater mount does not become warm
*1: Displayed failure codes [CA559] and [CA2249]
PC138US, USLC-8
Operated for long period
If air bleeding plug of fuel filter is removed, fuel does not
flow out
If spill hose from injector is disconnected, little fuel spills
Causes
E
w
w
w
w
Q
w
w
Q
q
q
q
Remedy
SEN02469-01
E E
w Q
Q Q
w
w
w
w
w Q
w
w
w
w
q
q
q
q
q
q
q
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