Komatsu PC200-8M0, Shop Manual

Page: 945 / 1254

SEN06140-00
PC200, 200LC, 220, 220LC-8M0 40-600
23
600 Troubleshooting of engine (S-mode)
S-16 Vibration is excessive
S-16 Vibration is excessive
General causes why vibration is excessive
q
Defective parts (premature wear or breakage)
q
Misalignment between engine snd hydraulic pump
q
Abnormal combustion
a
If unusual noise is made and vibration is excessive, perform troubleshooting also
for “S-15 Unusual noise is made”.
Cause
S
tuck v
a
lve sys
tem (valve, r
o
cker
arm
, etc
.)
W
o
rn
mai
n
b
earin
g
and
con
necting
rod
b
earin
g
Improp
er
g
ear tra
in backla
s
h
W
o
rn camshaf
t bushing
Improp
er i
n
jectio
n timin
g
(Pro
blem
wit
h
cool
ant o
r b
oost tempe
ra
tu
re se
nsor)
Lo
o
s
e
e
n
g
ine
mo
un
t bo
lt
s or
b
rok
en
cu
sh
io
n
s
Misa
lign
m
e
n
t
o
f en
gine
a
nd hydrau
lic pump
Broke
n
p
a
rt
s in
d
a
mper chambe
r
Question
s
Check recent repair history.
Machine opera-
tion hours
Operated for long period
E E E
Vibration
Suddenly increased.
Q Q
Gradually increased.
Q Q Q
Oil other than specified one is used
Q Q
Metal particles are found in the removed oil filter.
w w
Metal particles are found in oil drained from oil pan.
w w
Che
ck items
Oil pressure is low at low idle.
Q Q
Vibration occurs at mid-range speed.
Q Q
Vibration follows engine speed.
Q Q Q Q
Exhaust smoke is black.
w Q
T
ro
uble
s
hootin
g
Check valve system.
q
Check main bearing and connecting rod bearing.
q
Check gear train.
q
Check camshaft bushing.
q
Check the condition by using monitoring function of machine monitor.
q
Check engine mounting bolts and cushions.
q
When radial runout and facial runout are checked, misalignment is found.
q
Check inside of damper chamber.
q
Remedy
Re
place
Re
place
Re
place
Re
place
Re
place
Re
place
Adjust Re
place