S-19 Vibration Is Excessive - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting of engine (S-mode)

S-19 Vibration is excessive

Failure Vibration is excessive.
If unusual noise is heard and vibration is excessive, perform troubleshooting for "S-18
Related
Unusual noise is heard", too.
information
If any failure code is displayed, perform troubleshooting for that code first.
No. Cause
Loose engine mounting bolts
1
or defective cushions
Defective output shaft or
2
internal defect of damper
Misalignment and facial
runout at connection between
3
engine and hydraulic pump
are out of standard range.
Defective injector
4
Worn main bearing or
5
connecting rod bearing
6 Stuck valve or rocker arm
Worn camshaft bushing
7
40-538
(D37-BC0-400-A-Z0-A)
Point to check, remarks
Visually check engine mounting bolts for
looseness and cushions for cracks and
hardening.
Check output shaft for damage and damper
for internal defect.
Measure misalignment and facial runout at
connection between engine and hydraulic
pump.
Some cylinder is found to be cool when
exhaust manifolds are touched by hand
immediately after engine is started.
When engine is run in cylinder cutout mode
with some cylinder cut out, engine speed
does not change.
(Reference: See Testing and adjusting,
"Handling cylinder cutout mode operation".)
If metal particles are found in oil pan or oil
filter, overhaul engine.
If metal particles are found in oil pan or oil
filter, open cylinder head cover and check
valves and rocker arms.
If metal particles are found in oil pan or oil
filter, overhaul engine and check camshaft
bushings.
Remedy
Retighten bolts or
replace cushions.
Replace defective
parts.
Replace defective
parts.
Replace injector.
Repair or replace
damaged parts.
Repair or replace
damaged parts.
Replace camshaft
bushings.
PC88MR-10