Komatsu PC130-7, Shop Manual

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20-614
PC130-7
TROUBLESHOOTING
Confirm recent repair history
Operated for long period
Check items
Questions
Degree of use of machine
Troubleshooting
Clean Replace Replace Clean Clean Correct Replace Adjust Replace Adjust Correct Clean Replace Replace
Remedy
Replacement of filters has not been carried out according
to Operation Manual
Suddenly
Gradually
Power was lost
Non-specified fuel is being used
Dust indicator lamp is red
Engine oil must be added more frequently
High idling speed under no load is normal, but speed
suddenly drops when load is applied
When exhaust manifold is touched immediately after starting
engine, temperature of some cylinders is low
There is hunting from engine (rotation is irregular)
Clanging sound is heard from around cylinder head
High idling speed of engine is low
Leakage from fuel piping
Blow-by gas is excessive
Engine pickup is poor and combustion is irregular
When air cleaner element is inspected directly, it is found to be
clogged
When lever is placed at FULL position, it does not contact stopper
When feed pump is operated, operation is too light or too heavy
When fuel tank cap is inspected directly, it is found to be clogged
When valve clearance is checked directly, it is found to be
outside standard value
Color of exhaust gas
Black
Blue under light load
Noise of interference is heard from around turbocharger
When turbocharger is rotated by hand, it is found to be heavy
When compression pressure is measured, it is found to be low
When fuel filter, strainer are inspected directly, they are
found to be clogged
When control rack is pushed, it is found to be heavy, or
does not return
Speed does not change when operation of certain cylinders
is stopped
When feed pump strainer is inspected directly, it is found to be
clogged
Worn piston rin
g, cy
linder
Seized turbochar
ger, interferen
ce
Clo
gged air cleaner e
lement
Clogged
fuel filter
, strainer
Cl
o
gged fee
d pump strain
er
Clogge
d injection no
zz
le
, defecti
ve spray
Seized
injectio
n p
ump p
lun
ger
Impro
per
valve cleara
nce
Defecti
ve contact
of valve an
d valve seat
Bent fuel lever linkage, defecti
ve a
djustment
Clogged, leaking fuel pipin
g
Defectiv
e boost compensator
diaphra
gm
Defecti
ve westgate
d
iaphragm
Clogged air
breather h
ole in f
uel tank
Causes
S-6 Engine lacks output
(or lacks power)
General causes why engine lacks output
• Insufficient intake of air
• Insufficient supply of fuel
• Improper condition of fuel injection
• Improper fuel used
(if non-specified fuel is used, output drops)
• Lack of output due to overtaking
a
If there is overheating and lack of output, carry
out troubleshooting for overheating.
S-6
(1)