Engine Does Not Pick Up Smoothly - Komatsu PC200-8M0 Shop Manual

SEN06140-00
S-3 Engine does not pick up smoothly
General causes why engine will not pick up smoothly
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Insufficient intake of air
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Insufficient supply of fuel
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Improper of fuel injection
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Improper selection of fuel
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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 opera-
Operated for long period
tion hours
Engine pickup suddenly became worse.
Fuel other than specified one is used
Filters are not replaced as indicated in the Operation and Maintenance Manual.
Engine oil must be added more frequently.
Dust indicator indicates a red zone
Air breather hole in fuel tank cap is clogged.
Rust and water are found when fuel tank is drained.
Fuel is leaking from fuel piping.
When priming pump is operated, no resistance is felt or it is heavy.
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low.
Color of exhaust Blue under light load.
smoke Black.
While engine is running, unusual noise is heard around cylinder head.
While engine is running, interference sound is heard around turbocharger.
High idle speed is normal, but speed suddenly drops when load is applied.
Engine hunts.
Blowby gas is excessive.
Check air cleaner.
When compression pressure is measured, it is found to be low.
Check valve clearance.
When turbocharger is rotated by hand, it is found to be heavy.
When air is bled from fuel system, air comes out.
Check fuel filter.
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.
*1: Failure codes [CA559] and [CA2249]
10
40-600
600 Troubleshooting of engine (S-mode)
S-3 Engine does not pick up smoothly
Cause
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Remedy
PC200, 200LC, 220, 220LC-8M0
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