Komatsu Galeo PC800-8, Shop Manual

Page: 847 / 1117

PC800, 850-8
11
40 Troubleshooting
SEN00795-02
*1: Failure codes [ CA559 ] and [ CA2249 ]
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
• Insufficient supply of fuel
• Insufficient intake of air
• Improper selection of fuel
Causes
Cl
ogge
d ai
r c
lea
ner
el
em
ent
W
orn
d
yn
am
ic
va
lve
syst
em
(V
alve
, ro
cke
r le
ve
r,
et
c.
)
W
or
n pi
st
on r
in
g,
c
yl
inde
r l
iner
Us
e of
im
pr
op
er
fu
el
Cl
ogge
d ai
r br
ea
th
er
hol
e
of f
uel
tan
k
cap
Le
ak
ing
o
r c
lo
gge
d fu
el
s
ys
te
m, ent
ry
of
a
ir
Cl
ogge
d fu
el
fi
lter
, s
tr
ai
ne
r
Cl
ogge
d fe
ed pump
g
auz
e f
ilt
er
S
tuc
k,
s
ei
zed s
upp
ly
pump pl
ung
er
C
lo
gg
ed
in
je
ct
or
, d
efe
cti
ve
s
pr
ay
De
fec
tiv
e, de
ter
ior
at
ed ba
tter
y
De
fec
tiv
e c
oo
lan
t t
emper
atu
re
se
ns
or
, w
iri
ng
h
ar
nes
s
De
fec
tiv
e
intak
e ai
r he
at
er
s
ys
tem
Que
s
tio
ns
Confirm recent repair history
Degree of use of machine Operated for long period
E EE E
Suddenly failed to start
w w 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 w w
Engine oil must be added more frequently
w
When engine is preheated or when temperature is low, preheating monitor does not indicate
normally (if monitor is installed)
w
Dust indicator is red (if indicator is installed)
w
Air breather hole of fuel tank cap is clogged
Q
Rust and water are found when fuel tank is drained
Q w w
When fuel filter is removed, there is not fuel in it
Q
Fuel is leaking from fuel piping
w
When priming pump is operated, it makes no reaction or it is heavy
w Q Q
Starting motor cranks engine slowly
w
Ch
ec
k 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 w
If spill hose from injector is disconnected, little fuel spills
w
When exhaust manifold is touched immediately after starting engine, temperature of some
cylinders is low
w
T
rou
bl
e
s
h
oot
ing
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, strainer directly
q
Inspect feed pump gauze filter directly
q
Carry out troubleshooting for “Rail Press (Very) Low Error. (*1)”. See *1 for failure code.
q
When injector unit is tested, spray condition is bad
q
When specific gravity of electrolyte and voltage of battery are measured, they are low
q
Coolant temperature gauge does not indicate normally (if coolant temperature gauge is
installed)
q
When starting switch is turned to HEAT, intake air heater mount does not become warm
q
Remedy
Clean Replac
e
Replac
e
Replac
e
Clean Corr
ec
t
Clean Clean Replac
e
Replac
e
Replac
e
Replac
e
Replac
e