Engine Runs Rough Or Is Unstable - Komatsu PC200-8M0 Shop Manual

SEN06140-00
S-5 Engine runs rough or is unstable
General causes why engine runs rough or is unstable
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Air in fuel system
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Defective engine speed sensor (error at degree that does not generate failure code)
Check recent repair history.
Machine operation
hours
Hunting:
Filters are not replaced as indicated in the Operation and Maintenance Manual.
Fuel tank is found to be empty.
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 air is bled from fuel system, air comes out.
Check fuel filter.
When a certain cylinder is cut out, engine speed does not change.
Perform troubleshooting for "Eng Ne Speed Sensor Error" according to failure code (*1).
Perform troubleshooting for "Eng Backup Speed Sensor Error" according to failure code (*2).
*1: Failure code [CA689]
*2: Failure code [CA778]
12
40-600
Operated for long period
Occurs at a certain speed range.
Occurs at low idle.
Occurs even when speed is raised.
Occurs on slope.
600 Troubleshooting of engine (S-mode)
S-5 Engine runs rough or is unstable
Cause
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Remedy
PC200, 200LC, 220, 220LC-8M0
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