Komatsu 75001, Руководство по ремонту

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SEN03850-00
WA250, 250PZ-6 40-600
9
600 Troubleshooting of engine (S-mode)
S-2 Engine does not start
*1: Failure code [CA559] and [CA2249] in the display of code
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
q
Lack of rotating force due to defective electrical system
q
Insufficient supply of fuel
q
Insufficient intake of air
q
Improper selection of fuel
Causes
C
log
ge
d ai
r cle
an
er
el
e
m
en
t
W
o
rn
dy
na
mi
c val
v
e
sys
te
m
(
V
al
ve
,
ro
cke
r
le
ver
, et
c.
)
W
o
rn
pi
st
on
r
in
g
, cyl
inde
r
U
s
e
of
imp
rop
er
f
ue
l
C
log
ge
d ai
r br
ea
the
r h
ol
e of
f
ue
l t
a
nk c
ap
Le
ak
in
g
or
cl
og
ge
d f
u
e
l sy
s
tem
, en
tr
y
of
a
ir
C
log
gi
ng
o
f f
u
el
f
ilt
e
r
S
tuc
k
, s
e
iz
e
d
su
pp
ly
p
u
m
p
pl
un
ge
r
C
log
ge
d in
je
ct
o
r,
de
fe
ct
iv
e sp
ra
y
D
e
fe
ct
iv
e,
de
te
ri
o
rat
ed
ba
tt
e
ry
D
e
fe
ct
iv
e co
ol
an
t
te
mpe
rat
ur
e
s
e
n
s
o
r,
w
ir
ing
har
n
e
ss
D
ef
ec
ti
ve
in
tak
e
ai
r he
a
ter
sy
s
tem
Q
u
es
ti
on
s
Confirm recent repair history
Degree of use of machine Operated for long period
E E E
Suddenly failed to start w w Q
Non-specified fuel is being used Q Q
Replacement of filters has not been carried out according to Operation and
Maintenance Manual
w w
Oil must be added more frequently
w
When engine is preheated or when temperature is low, preheating monitor does not
indicate normally
w
Dust indicator is red w
Air breather hole of fuel tank cap is clogged Q
Rust and water are found when fuel tank is drained w
Fuel is leaking from fuel piping
w
When priming pump is operated, it makes no reaction or it is heavy w Q
Starting motor cranks engine slowly w
C
h
eck
i
tems
When engine is cranked, abnormal sound is generated around cylinder head w
While engine is cranked with
starting motor,
If air bleeding plug of fuel filter is removed, fuel does not
flow out
Q w
If spill hose from injector is disconnected, little fuel spills w
T
rou
bl
es
h
oo
tin
g
Inspect air cleaner directly
q
Inspect dynamic valve system directly q
When compression pressure is measured, it is found to be low q
When air is bled from fuel system, air comes out q
Inspect fuel filter directly
q
Carry out troubleshooting according to “No-pressure feed by supply pump (*1)” in display
of code
q
When specific gravity of electrolyte and voltage of battery are measured, they are low q
Coolant temperature gauge does not indicate normally q
When starting switch is turned to HEAT, intake air heater mount does not become warm
q
Remedy
Cl
e
a
n
R
e
pl
ac
e
R
e
pl
ac
e
R
e
pl
ac
e
Cl
e
a
n
Co
rre
ct
R
e
pl
ac
e
R
e
pl
ac
e
R
e
pl
ac
e
R
e
pl
ac
e
R
e
pl
ac
e
R
e
pl
ac
e