Vibration Is Excessive - Komatsu Galeo PC138US-8 Shop Manual

40 Troubleshooting
S-16 Vibration is excessive
General causes why vibration is excessive
Defective parts (abnormal wear, breakage)
q
Misalignment between engine and chassis
q
Abnormal combustion
q
a If abnormal noise is made and vibration is excessive, carry out trouble-
shooting for "S-15 Abnormal noise is made", too.
Confirm recent repair history
Degree of use of machine
Condition of vibration
Non-specified oil is being used
Metal particles are found when oil filter is drained
Metal particles are found when oil pan is drained
Oil pressure is low at low idle
Vibration occurs at mid-range speed
Vibration follows engine speed
Exhaust smoke is black
Inspect dynamic valve system directly
Inspect main bearing and connecting rod bearing directly
Inspect gear train directly
Inspect camshaft bushing directly
Confirm with monitoring function
Inspect engine mounting bolts and cushions directly
Inspect output shaft or inside of damper directly
PC138US, USLC-8
Operated for long period
Suddenly increased
Gradually increased
SEN02469-01
Causes
E E
Q
Q Q
Q Q
w w
w w
Q Q
Q
w Q
q
q
q
q
q
Remedy
1
E
Q
Q
Q Q
Q Q
q
q
25