Komatsu Galeo PC800-8 User Manual

8 PC800, 850-8
SEN00795-02 40 Troubleshooting
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
Causes
Cracked EGR cooler (Coolant in exhaust pipe) Broken flywheel ring gear Defective or deteriorated battery Defective connection of battery terminal Defective battery relay Defective starting switch Defective starting motor (safety relay section) Defective starting motor (motor section) Defective starting circuit wiring Defective hydraulic pump
Questions
Confirm recent repair history
Degree of use of
machine
Operated for long period
EEE
Condition of horn when
starting switch is turned
ON
Horn does not sound
QQ w
Horn volume is low
w
Battery electrolyte is low
w
Battery terminal is loose
w
When starting switch is turned ON, there is no operating sound from battery relay
Qw
Check items
When starting switch is turned to START, starting pinion does not move out
QQw
When starting switch is
turned to START, start-
ing pinion moves out,
but
Speed of rotation is low
Qw
Makes grating noise
ww
Soon disengages again
w
Makes rattling noise and does not turn
wQ Qw
Troubleshooting
When EGR cooler outlet gas piping is removed, coolant containing antifreeze flows out (*1).
q
Carry out troubleshooting in E-mode Carry out troubleshooting in H-mode
Inspect flywheel ring gear directly
q
When specific gravity of electrolyte and voltage of battery are measured, they are low
q
Turn starting switch
OFF, connect cord, and
carry out troubleshoot-
ing at ON
There is not voltage (20 – 30 V) between battery relay terminal B and
terminal E
q
When terminal B and terminal C of starting switch are connected,
engine starts
q
When terminal B and terminal C at safety relay outlet are connected,
engine starts
q
Even if terminal B and terminal C at safety relay outlet are connected,
engine does not start
q
Remedy
Replace Replace Replace
Correct
Replace Replace Replace Replace
——

Komatsu Galeo PC800-8 Specifications

General

Brand	Komatsu
Model	Galeo PC800-8
Category	Excavators
Language	English