Engine Lacks Power - Komatsu PC200-8M0 Shop Manual

600 Troubleshooting of engine (S-mode)
S-6 Engine lacks power
S-6 Engine lacks power
General causes why engine lacks power
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Insufficient intake of air
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Insufficient supply of fuel
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Improper fuel injection
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Improper selection of fuel
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Engine overheating
oSee "S-14 Coolant temperature becomes too high (overheating)".
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Controller is controlling in derate mode.
(limiting injection rate (power) because of an error in electrical system)
Check recent repair history.
Machine operation
Operated for long period
hours
suddenly
Power was lost
gradually
Fuel other than specified one is used
Filters are not replaced as indicated in the Operation and Maintenance Manual.
Oil must be added more frequently.
Dust indicator indicates a red zone
Air breather hole in fuel tank cap is clogged.
Fuel is leaking from fuel piping.
Power becomes insufficient after short stop of operation.
black
Color of exhaust
smoke
blue under light load
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low.
While engine is running, interference sound is heard around turbocharger.
While engine is running, unusual noise is heard around cylinder head.
High idle speed is too high.
High idle speed is normal, but speed suddenly drops when load is applied.
Engine does not pick up smoothly and combustion is irregular.
Engine hunts.
Blowby gas is excessive
Check air cleaner.
Check air intake piping.
When boost pressure is measured, it is found to be low.
When compression pressure is measured, it is found to be low.
Check valve clearance.
Check fuel piping.
Check fuel filter.
Check spill port check valve.
Perform troubleshooting for "Supply pump pressure low error" according to failure
code (*1).
When a certain cylinder is cut out, engine speed does not change.
Check boost air pressure sensor mount.
Perform troubleshooting for "Charge pressure sensor error" according to failure code
(*2).
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA122] and [CA123]
PC200, 200LC, 220, 220LC-8M0
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Remedy
SEN06140-00
Causes
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40-600
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13