Komatsu 75001, Руководство по ремонту

Страница: 997 / 1293

SEN03850-00
40-600
16
WA250, 250PZ-6
600 Troubleshooting of engine (S-mode)
S-9 Oil becomes contaminated quickly
S-9 Oil becomes contaminated quickly
1
General causes why oil becomes contaminated quickly
q
Entry of exhaust gas into oil due to internal wear
q
Clogging of lubrication passage
q
Use of improper fuel
q
Use of improper oil
q
Operation under excessive load
Causes
D
e
fe
ct
iv
e
se
al
a
t t
u
rboc
ha
rg
e
r t
u
rb
in
e
e
n
d
W
or
n
v
al
v
e,
va
lv
e gu
id
e
W
o
rn
p
is
to
n
r
ing
,
cy
lind
er
C
log
ge
d b
re
at
h
er
, b
rea
th
er
h
o
se
C
log
ge
d o
il c
oo
le
r
C
log
ge
d o
il f
ilt
e
r
D
e
fe
c
ti
ve
o
il
fil
te
r s
a
fe
ty
v
a
lv
e
C
log
ge
d
tur
b
oc
ha
rg
er
lub
ric
a
tio
n dr
a
in
t
u
be
E
x
h
aus
t
sm
ok
e i
s
ba
d
Q
u
es
ti
on
s
Confirm recent repair history
Degree of use of machine Operated for long period E E E
Non-specified fuel is being used Q Q
Oil must be added more frequently
w
Metal particles are found when oil filter is drained Q Q w
Inside of exhaust pipe is dirty with oil w
Engine oil temperature rises quickly w
C
h
eck
it
em
s
Color of exhaust gas is
Blue under light load
w
Black w
Amount of blow-by gas
Excessive Q Q w Q
None w
T
rou
bl
es
ho
ot
in
g
Excessive play of turbocharger shaft q
Se
e
S-7
When compression pressure is measured, it is found to be low q q
Check breather and breather hose directly q
Inspect oil cooler directly
q
Inspect oil filter directly q
Spring of oil filter safety valve is hitched or broken q
Inspect turbocharger lubrication drain tube directly q
Remedy
Re
p
la
c
e
Re
p
la
c
e
Re
p
la
c
e
Cl
e
a
n
Cl
e
a
n
Re
p
la
c
e
Re
p
la
c
e
Cl
e
a
n
—