Startability Is Poor - Komatsu PC200-8M0 Shop Manual

SEN06140-00
S-1 Startability is poor
General causes why startability is poor
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Defective electrical system
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Insufficient supply of fuel
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Insufficient intake of air
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Improper selection of fuel
a The common rail fuel injection system (CRI) controls the fuel injection timing
electrically. Accordingly, even if the engine is cranked properly, the engine
may not start until the crankshaft rotates two turns under the most disadvan-
tageous condition. This phenomenon does not mean a problem, however.
Check recent repair history.
Machine opera-
Operated for long period
tion hours
Starting perfor- Became worse gradually
Engine starts easily when warm.
mance
Fuel other than specified one is used
Filters are not replaced as indicated in the Operation and Maintenance Man-
ual.
Engine oil must be added more frequently.
When engine is preheated or when temperature is low, preheating monitor
does not indicate proper functioning of preheating system.
During operation, charge level monitor indicates abnormal charge.
Dust indicator indicates a red zone
Air breather hole in fuel tank cap is clogged.
Fuel leaks from fuel piping.
If priming pump is operated, no resistance is felt or it is heavy.
Starting motor cranks engine slowly.
When engine is Even if air bleeding plug in fuel filter head is removed, fuel
cranked with does not flow out.
If spill hose from injector is disconnected, little fuel spills.
starting motor,
When exhaust manifold is touched immediately after starting engine, temper-
ature of some cylinders is low.
Engine does not pick up smoothly and combustion is irregular.
Engine hunts.
Blowby gas is excessive
Check air cleaner.
When compression pressure is measured, it is found to be low.
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).
Even if a cylinder is cut out, engine speed does not change.
Even if starting switch is turned to HEAT, intake air heater mount does not
become warm.
Is voltage 20 – 30 V between alternator terminal B and terminal E
when engine is running at low idle speed?
Specific gravity of electrolyte and voltage of battery are low.
*1: Failure codes [CA559] and [CA2249]
6
40-600
600 Troubleshooting of engine (S-mode)
Cause
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Yes
None
Remedy
PC200, 200LC, 220, 220LC-8M0
S-1 Startability is poor
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