Engine Lacks Output (Or Lacks Power) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
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.
Confirm recent repair history
Degree of use of machine
Power was lost
Engine oil must be added more frequently
Replacement of filters has not been carried out according
to Operation Manual
Non-specified fuel is being used
Dust indicator lamp is red
Color of exhaust gas
Noise of interference is heard from around turbocharger
Blow-by gas is excessive
Engine pickup is poor and combustion is irregular
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
When air cleaner element is inspected directly, it is found to be
clogged
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 feed pump strainer is inspected directly, it is found to be
clogged
Speed does not change when operation of certain cylinders
is stopped
When control rack is pushed, it is found to be heavy, or
does not return
When valve clearance is checked directly, it is found to be
outside standard value
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
20-614
(1)
Operated for long period
Suddenly
Gradually
Black
Blue under light load
Remedy
Causes
PC130-7
S-6