Komatsu 170-3 Series, Руководство по ремонту, Страница: 164 / 454

170-3 SERIES
12-107
TROUBLESHOOTING
Confirm recent repair history
Degree of use of machine Operated for long period
Horn does not sound
Horn volume is low
Battery electrolyte is low
Battery terminal is loose
When starting switch is turned to ON, there is no clicking sound from battery relay
When starting switch is turned to START, starting pinion does not move out
Speed of rotation is low
Makes grating noise
Soon disengages again
Makes rattling noise and does not turn
Questions
Check items
Condition of horn when starting
switch is turned ON
Inspect flywheel ring gear directly
When specific gravity of electrolyte and voltage of battery are measured, one of them is low
When terminal B and terminal C of starting switch are connected, engine starts
There is no 24V between battery relay terminal B and terminal E
When terminal B and terminal C of starting motor are connected, engine starts
When terminal B and terminal C of safety relay are connected, engine starts
When terminal of safety switch and terminal B of starting motor are connected, engine starts
T
roubleshooting
Replace Replace Correct
—
Replace Replace Replace Replace
Remedy
Broken flywheel ring gear Defective or deteriorated battery Defective battery terminal connection Defective starting circuit wiring Defective starting switch Defective battery relay Defective starting motor Defective safety relay or safety switch
Causes
When starting switch is turned
to START, starting pinion moves
out, but
Turn starting switch
OFF, connect cord,
and carry out
troubleshooting at
ON
1. Carry out troubleshooting of machine
1.
S-2 Engine does not start
a) Engine does not turn
General causes why engine does not turn
• Internal parts of engine seized
a
See Troubleshooting S-4.
• Defective electrical system
• Problem in power train (troubleshooting for machine)
a
See the manual for the machine.
S-2
(10)
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