Komatsu PC210-8, Shop Manual

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UEN00246-02 40 Troubleshooting
24
PC210, 230, 240-8
S-16 Vibration is excessive 1
General causes why vibration is excessive
q
Defective parts (abnormal wear, breakage)
q
Misalignment between engine and chassis
q
Abnormal combustion
a
If abnormal noise is made and vibration is excessive, carry out trouble-
shooting for "S-15 Abnormal noise is made", too.
Causes
S
tuck dy
nami
c val
ve sy
stem (
valv
e, r
ock
er l
e
ve
r)
W
or
n main
bearing, connecting
rod bea
ring
Imprope
r gear
train backlash
W
or
n camshaf
t bush
ing
Imprope
r injection timing (
A
bnormality in coolan
t
temperat
ure sensor
, boost temper
ature sensor)
Loose engine mounting bolt
s, broken cushions
Misalignme
nt between
engine
and devic
es on applicable machin
e side
Broken output shaf
t, p
art
s in
damper
on applicable machin
e side
Questions
Confirm recent repair history
Degree of use of machine Operated for long period
E E E
Condition of vibration
Suddenly increased
Q Q
Gradually increased
Q Q Q
Non-specified oil is being used
Q Q
Metal particles are found when oil filter is drained
w w
Metal particles are found when oil pan is drained
w w
Check 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
roubleshooting
Inspect dynamic valve system directly
q
Inspect main bearing and connecting rod bearing directly
q
Inspect gear train directly
q
Inspect camshaft bushing directly
q
Check with monitoring function
q
Inspect engine mounting bolts and cushions directly
q
When alignment is checked, radial runout or facial runout is detected
q
Inspect inside of damper directly
q
Remedy
Re
place
Re
place
Re
place
Re
place
Re
place
Re
place
Adjust Re
place