Engine Does Not Start - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting
S-2 Engine does not start
a) Engine does not turn
General causes why engine does not turn
Seized parts inside engine
q
See "S-4 Engine stops during operations
Defective electrical system
q
Problem in drive devices on applicable machine side
q
Carry out troubleshooting for devices on applicable machine
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, starting pinion moves
out, but
Inspect flywheel ring gear directly
When specific gravity of electrolyte and voltage of battery are measured, they are low
Turn starting switch OFF, con-
nect cord, and carry out trouble-
shooting at ON
114E-3 Series
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
When terminal at safety switch and terminal B at
starting motor are connected, engine starts
SEN00458-01
Causes
E E
Q Q
w
w
w
Q w
Q Q
w
w
Q
q
q
q
q
Remedy
1
w
w
w
w
Q Q
q
q
q
7