Komatsu 95-2 Series User Manual

12-108 95-2 SERIES
S-2 Engine does not start
(1) Engine does not turn
General causes why engine does not turn
• Internal parts of engine seized
fl If internal parts of the engine are seized,
carry out troubleshooting for “Engine
stops during operations”.
• Failure in power train
• Defective electrical system
TROUBLESHOOTING S-2
Confirm recent repair history
Degree of use
Condition of horn when starting
switch is turned ON
When starting switch is
turned to START, pinion
moves out, but
When starting switch is turned to START, pinion does not move out
When starting switch is turned to ON, there is no clicking sound
Battery terminal is loose
When starting switch is turned to ON, linkage dose not move
When battery is checked, battery electrolyte is found to be low
Specific gravity of electrolyte, voltage of battery is low
For the following conditions 1) – 5), turn the starting switch
OFF, connect the cord, and carry out troubleshooting at ON
1) When terminal B and terminal C of starting switch are
connected, engine starts
2) When terminal B and terminal C of starting motor are
connected, engine starts
3) When terminal B and terminal C of safety relay are
connected, engine starts
4) When terminal of safety switch and terminal B of
starting motor are connected, engine starts
5) There is no 24V voltage between battery relay terminal
b and terminal E
When ring gear is inspected directly, tooth surface is found
to be chipped
Does not move even when fuel cut solenoid linkage is disconnected
Does not move even when engine stop motor linkage is disconnected
Questions
Check items
Troubleshooting
Remedy
Causes
Replace Replace Replace Replace Replace Replace Replace Adjust Replace Replace
Legend
: Possible causes (judging from Questions and check items)
: Most probable causes (judging from Questions and Check items)
: Possible causes due to length of use (used for a long period)
: Items to confirm the cause.
Defective wiring of starting circuit
Defective or deteriorated battery
Defective starting m
otor
Broken ring gear
Defective safety relay or safety switch
Defectinve battery relay
Defective battery terminal conncetion
Defective fuel cut solenoid
Defective adjustm
ent of engine stop m
otor wire
Defective engine stop motor
Defective starting switch
Operated for long period
Horn does not sound
Horn sound level is low
Roaing speed is slow
Makes grating noise
Soon disengages again
Makes rattling noise and
does not turn
—
Carry out troubleshooting for defective wiring of starting circuit
12-108
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Komatsu 95-2 Series Specifications

General

Brand	Komatsu
Model	95-2 Series
Category	Engine
Language	English