Komatsu PC210-8, Shop Manual

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UEN00246-02 40 Troubleshooting
6
PC210, 230, 240-8
S-1 Starting performance is poor 1
*1: Displayed failure codes [CA559] and [CA2249]
General causes why starting performance is poor
q
Defective electrical system
q
Insufficient supply of fuel
q
Insufficient intake of air
q
Improper selection of fuel
a
The common rail fuel injection system (CRI) recognizes the
fuel injection timing electrically. Accordingly, even if the
starting operation is carried out, the engine may not start
until the crankshaft revolves 2 turns at maximum. This phe-
nomenon does not indicate a trouble, however.
Causes
Clogged
air
cleaner
eleme
nt
De
fective con
tact
of valve, va
le seat
W
orn piston ring, cylin
der
Clogged
air
breathe
r hole of fuel t
ank cap
Leaking or clogged fuel pipin
g, entry of air
Clogged
fuel filter
, element
S
tuck, seized supply pump plunger
Defec
tive i
njector
De
fective int
ake a
ir
heater system
De
fective alte
rnator
(re
gulato
r section)
De
fective alte
rnator
(gener
ator sectio
n)
De
fective, deterior
ated batter
y
Questions
Confirm recent repair history
Degree of use of machine Operated for long period
E E E
Starting performance
Became worse gradually
Q w w Q
Engine starts easily when warm
w w
Non-specified fuel is being used
Q Q Q
Replacement of filters has not been carried out according to Operation and Mainte-
nance Manual
w w Q Q
Engine oil must be added more frequently
w
When engine is preheated or when temperature is low, preheating monitor does not
indicate normally
w
During operation, charge level monitor indicates abnormal charge
w w
Dust indicator is red
w
Air breather hole of fuel tank cap is clogged
w
Fuel is leaking from fuel piping
w Q
When priming pump is operated, it makes no reaction or it is heavy
w Q
Starting motor cranks engine slowly
w
C
heck items
While engine is cranked
with starting motor
If air bleeding plug of fuel filter is removed, fuel does not
flow out
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
Engine does not pick up smoothly and combustion is irregular
Q Q w
There is hunting from engine (rotation is irregular)
Q w Q
Blow-by gas is excessive
w
T
roublesh
ooting
Inspect air cleaner directly
q
When compression pressure is measured, it is found to be low
q q
When air is bled from fuel system, air comes out
q
Inspect fuel filter, strainer directly
q
Carry out troubleshooting according to "Rail Press (Very) Low Error (*1)" indicated by
code
q
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not
change
q
When starting switch is turned to HEAT, intake air heater mount does not become warm
q
Is voltage 20 – 30 V between alternator terminal B and terminal E with
engine at low idle?
Yes
q
No
q
When specific gravity of electrolyte and voltage of battery are measured, they are low
q
Remedy
Clean Replace Replace Clean cor
re
ct
Clean Replace Replace Replace Replace Replace Replace