Komatsu PC200-8M0, Shop Manual, Page: 933 / 1254

SEN06140-00
PC200, 200LC, 220, 220LC-8M0 40-600
11
600 Troubleshooting of engine (S-mode)
S-4 Engine stops during operation
S-4 Engine stops during operation
*1: Failure codes [CA559] and [CA2249]
General causes why engine stops during operation
q
Internal parts of engine seized
q
Insufficient supply of fuel
q
Engine overheating
q
Defect in hydraulic pump
Cause
Damage
of valve system (v
alve,
rocker
lev
e
r,
etc.)
Broken or seize
d
p
iston conne
cti
ng rod
Broken or seize
d
cra
n
kshaf
t be
aring
Broken or seize
d
g
ear tra
in
Insuf
ficien
t fu
el in t
ank
Clo
gged
a
ir
b
reather hol
e in fu
el t
ank cap
Clo
gged
o
r le
aking
fue
l p
ipi
ng
Clo
ggin
g
of fuel
filter
Clo
ggin
g
of feed
p
n
mp
gauze
filter
Broken or seize
d
fee
d
pump
Broken sup
p
ly pump shaf
t
S
tu
c
k or seized
su
pply pnmp
pl
uge
r
Broken au
xilia
ry eq
uipmen
t (pu
m
p
o
r ai
r compre
sso
r, etc.)
Defective hydra
u
lic pump
Defective eng
ine
con
trol
ler pow
er
su
pply wirin
g
Defective st
a
rtin
g
sw
itch
w
iring
Question
s
Check recent repair history.
Machine operation
hours
Operated for long period.
E E
Condition when
engine stopped
Unusual 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 Q Q Q
Engine hunted and stopped.
w Q Q Q Q Q Q
Fuel other than specified one is used
Q Q Q Q
Filters are not replaced as indicated in the Operation and Mainte-
nance Manual.
w w
Fuel level monitor indicates low level.
w
Fuel tank is found to be empty.
w
Air breather hole in fuel tank cap is clogged.
w
Fuel is leaking from fuel piping.
w
When priming pump is operated, no resistance is felt or it is
w Q Q
Che
ck items
Rust and water are found when fuel tank is drained.
w w
Metal particles are found in oil drained from oil pan.
w w Q Q
When engine is
rotated by hand:
It does not rotate at all.
w w
It rotates only in opposite direction.
w
Crankshaft moves by amount of gear
backlash.
w w
Supply pump shaft does not turn.
w
Engine operates, but stops when load is applied from machine.
w
T
rou
ble
s
h
ooting
Check valve system.
q
Perform H-mode
trouble-
shoo
ti
ng
Check piston and connecting rod.
q
Check crankshaft bearing.
q
Check gear train.
q
Check fuel filter.
q
Check feed pump gauze filter.
q
Check the feed pump.
q
Perform troubleshooting for "Supply pump pressure low error”
according to failure code (*1).
q q
Engine operates if auxiliary equipment (pump, air compressor,
etc.) is removed.
q
Check engine controller power supply wiring.
q
Check starting switch wiring.
q
Remedy
R
epla
c
e
R
epla
c
e
R
epla
c
e
R
epla
c
e
Add
Clea
n
Rep
a
ir
R
epla
c
e
Clea
n
R
epla
c
e
R
epla
c
e
R
epla
c
e
R
epla
c
e
–
Rep
a
ir
Rep
a
ir