Komatsu PC130-7, Shop Manual, Page: 328 / 342

20-612
PC130-7
TROUBLESHOOTING
Confirm recent repair history
Operated for long period
Check items
Questions
Degree of use of machine
Troubleshooting
Replace Replace Replace Replace Replace Add Clean Clean Replace Replace Correct Clean Replace
Remedy
Condition when engine
stopped
Abnormal noise was heard and
engine stopped suddenly
Engine overheated and stopped
Engine stopped slowly
There was hunting and engine stopped
Fuel level lamp lights up
Fuel tank is found to be empty
Replacement of filters has not been carried out according
to Operation Manual
Non-specified fuel is being used
When feed pump is operated, operation is too light or too heavy
Mud is stuck to fuel tank cap
Engine rotates, but stops when power train is operated
When control rack is pushed, it is found to be heavy, or
does not return
Does not turn at all
Turns in opposite direction
Moves amount of backlash
When it is attempted to
turn by hand using
barring tool
Rust and water are found when fuel tank is drained
Metal particles are found when oil is drained
When fuel filter, strainer are inspected directly, they are
found to be clogged
Inspect feed pump directly
When feed pump strainer is inspected directly, it is found to
be clogged
Remove oil pan and inspect directly
Remove head cover and inspect directly
When gear train is inspected, it does not turn
Rotates when pump auxiliary equipment is removed
Shaft does not turn
Troubleshooting of chassis
—
Broken dynamic
valve system
(valve, rocker lever, etc.)
Broken, seized crankshaft bearing Broken,
sei
zed piston
, connectin
g rod
Broken, seized gear train Broken pump auxiliary equipment Broken fuel pump drive shaft, key
Insufficient fuel in tank
Clogged fuel filter, strainer Clogged fee
d p
ump strainer
Broken,
sei
zed feed p
ump piston
Clogged,
leaking f
uel pipin
g
D
efecti
ve in
jection p
ump (rac
k, plunger st
uck)
Fail
ure in po
wer train
Cl
ogged air breather hol
e in f
uel
tank
Causes
S-4 Engine stops during operations
General causes why engine stops during operations
•
Seized parts inside engine
• Insufficient supply of fuel
• Overheating
a
If there is overheating and the engine stops,
carry out troubleshooting for overheating.
• Failure in power train
a
If the engine stops because of a failure in the
power train, carry out troubleshooting for the
chassis.
S-4
(1)