Engine Does Not Start - Komatsu Galeo PC800-8 Shop Manual

SEN00795-02
S-2 Engine does not start
a) Engine does not turn
General causes why engine does not turn
• Internal parts of engine seized
→ See "S-4 Engine stops during operations."
• Water hammer caused by coolant which entered cylinder
• Defective electrical system
• Defective hydraulic pump
Confirm recent repair history
Degree of use of
machine
Condition of horn when
starting switch is turned
ON
Battery electrolyte is low
Battery terminal is loose
When starting switch is turned ON, there is no operating sound from battery relay
When starting switch is turned to START, starting pinion does not move out
When starting switch is
turned to START, start-
ing pinion moves out,
but
When EGR cooler outlet gas piping is removed, coolant containing antifreeze flows out (*1).
Inspect flywheel ring gear directly
When specific gravity of electrolyte and voltage of battery are measured, they are low
Turn starting switch
OFF, connect cord, and
carry out troubleshoot-
ing at ON
8
Operated for long period
Horn does not sound
Horn volume is low
Speed of rotation is low
Makes grating noise
Soon disengages again
Makes rattling noise and does not turn
There is not voltage (20 – 30 V) between battery relay terminal B and
terminal E
When terminal B and terminal C of starting switch are connected,
engine starts
When terminal B and terminal C at safety relay outlet are connected,
engine starts
Even if terminal B and terminal C at safety relay outlet are connected,

engine does not start

40 Troubleshooting
Causes
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Remedy
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PC800, 850-8