40 Troubleshooting SEN04125-02
PC130-8
9
S-2 Engine does not start 1
a) Engine does not turn
General causes why engine does not turn
q Seized parts inside engine
o See “S-4 Engine stops during operations”
q Defective electrical system
q Defective hydraulic pump
Causes
Broken flywheel ring gear
Defective or deteriorated battery
Defective connection of battery terminal
Defective battery relay
Defective starting switch
Defective safety relay
Defective starting motor (motor section)
Defective steering circuit wiring
Defective hydraulic pump
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EE
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 QQ w
When starting switch is
turned to START, starting
pinion moves out, but
Speed of rotation is low w
Makes grating noise ww
Soon disengages again w
Makes rattling noise and does not turn QQQQ
Troubleshooting
Inspect flywheel ring gear directly q
Carry out troubleshooting
on E-mode
Carry out troubleshooting
on H-mode
When specific gravity of electrolyte and voltage of battery are measured, they are low q
Turn starting switch OFF,
connect cord, and carry out
troubleshooting 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
When terminal at safety switch and terminal B at starting
motor are connected, engine starts
q
Remedy
Replace
Replace
Correct
Replace
Replace
Replace
Replace
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