Komatsu PC200-8M0, Shop Manual, Page: 941 / 1254

SEN06140-00
PC200, 200LC, 220, 220LC-8M0 40-600
19
600 Troubleshooting of engine (S-mode)
S-12 Oil pressure drops
S-12 Oil pressure drops
General causes why oil pressure drops
q
Leakage, clogging, or wear on lubrication system
q
Defective oil pressure control
q
Selection of oil by the temperature etc. specified in the Operation and Maintenance
Manual is not observed.
q
Deterioration of oil due to overheating
Cause
W
o
rn
mai
n
heari
ng
Lack of oi
l in oil
p
a
n
Cool
ant o
r fuel
i
n o
il
Clog
ged stra
ine
r in
o
il p
an
Clog
ged
or
broken
p
ipe
in
o
il
p
a
n
Defecti
v
e oil pu
mp
Defecti
v
e re
gul
ato
r
val
v
e
Clog
ged oi
l
fil
te
r
Leaki
ng,
crush
ed, cl
ogg
ed oil
pi
pin
g
Defecti
v
e co
ola
n
t tempera
tu
re
se
nsor or
wi
ring ha
rness
Question
s
Check recent repair history.
Machine opera-
tion hours
Operated for long period
E E E
Oil pressure monitor indicates low oil pressure.
Q w
Oil other than specified one is used
Q Q
Filters are not replaced as indicated in the Operation and Maintenance Manual.
w
Oil pressure
monitor:
(if installed)
Indicates pressure drop at low idle.
w
Indicates pressure drop at low and high idle.
Q w w w Q
Indicates pressure drop on slope.
w
Sometimes indicates pressure drop.
w Q
Oil pressure monitor indicates low oil pressure.
w w
Oil level in oil pan is low.
w
Check items
External lubrication piping is leaking or crushed.
w
Oil is milky or smells of diesel fuel.
w
Metal particles are found in oil drained from oil pan.
w
Metal particles are found in the removed oil filter.
w Q
T
ro
uble
s
hoo
tin
g Metal particles are found in oil filter.
q
See S-
13
Inspect oil pan strainer and pipe.
q q
Oil pump rotation is heavy or there is play in oil pump.
q
Valve and spring of regulator valve are fatigued or damaged.
q
Check oil filter.
q
If oil level sensor is replaced, oil level monitor indicates correct oil level.
q
Remedy
Rep
lace
Add
–
Cle
an
Cle
an
Rep
lace
Ad
jus
t
Ad
jus
t
Re
p
a
ir
Rep
lace