Komatsu BR380JG-1E0, Shop Manual, Page: 774 / 841

40 Troubleshooting SEN02307-00
BR380JG-1E0
11
S-4 Engine stops during operations 1
*1: Displayed failure codes [CA559] and [CA2249]
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
o
Carry out troubleshooting for devices on applicable
machine
Causes
Brok
en dy
nami
c val
ve sy
stem
(v
al
ve
, roc
ker
arm, e
tc.)
Br
oke
n, se
ized piston
, conn
ecting r
od
Br
oke
n, se
ized cranksh
af
t bear
ing
Br
oke
n, se
ized gear
train
In
suf
ficient fuel in t
ank
C
logg
ed air brea
ther hole of fu
el t
a
nk cap
L
eaking, clogged fuel piping
C
logg
ed fuel filter
Br
oke
n, se
ized feed pu
mp
Br
oke
n sup
ply pump shaf
t
S
tuck, seize
d supp
ly pump plunger
Br
oke
n auxiliar
y e
quipme
nt (pump, compr
essor
, etc.)
Pr
oblem in d
rive devices on ap
plicab
le machine side
Questio
ns
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
w w w w Q w Q w w
Engine overheated and stopped
w Q Q
Engine stopped slowly
w Q
There was hunting and engine stopped
w Q Q Q
Non-specified fuel is being used
Q Q 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
C
heck items
When priming pump is operated, it makes no reaction or it is heavy
w Q
Rust and water are found when fuel tank is drained
w
Metal particles are found when oil is drained
w w w Q
When engine is cranked
by hand
Does not turn at all
w w
Turns in opposite direction
w
Moves by amount of gear backlash
w w
Supply pump shaft does not turn
w
Engine turns, but stops when load is applied to machine
w
T
roubleshooting
Inspect dynamic valve system directly
q
Carr
y 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 “Rail Press (Very) Low Error (*1)”
indicated by code
q q
Engine rotates when pump auxiliary equipment (pump, compressor, etc.) is
removed
q
Remedy
Replace Replace Replace Replace Ad
d
Clea
n
Corr
ect
Clea
n
Replace Replace Replace Replace
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