Engine Does Not Start (Engine Does Not Turn) - Komatsu PC210-8 Shop Manual

40 Troubleshooting
E-3 Engine does not start (Engine does not turn)
Trouble

• Engine does not start (Engine does not turn).

• Engine starting circuit has following 2 start lock mechanisms.
Related infor-
1) Start lock with password of machine monitor
mation
2) Start lock with lock lever
1 Low charge level of battery
2 Defective fuse No. 3
Defective starting switch
3
(Internal disconnection)
Defective lock lever switch
4
(Internal disconnection)
Possible causes
and standard
value in normal
state
Defective starting motor cut-
out relay R06 or R07 (Inter-
5
nal disconnection or short
circuit)
Defective starting motor
6
safety relay (Internal defect)
PC210, 230, 240-8
Cause
a Prepare with starting switch OFF, then carry out troubleshooting
If fuse is broken, circuit probably has ground fault. (See cause 10.)
a Prepare with starting switch OFF, then keep starting switch OFF
Between (1) – (4)
a Prepare with starting switch OFF, then carry out troubleshooting
Between (1) – (3)
a Prepare with starting switch OFF, then carry out troubleshooting
a Prepare with starting switch OFF (with only terminal C discon-
Between B – E
Between C (R18) – E
If power supply, generation input, and starting input are normal but
starting output is not normal, starting motor safety relay is defective.
Standard value in normal state/Remarks on troubleshooting
without turning starting switch ON.
Battery voltage (2 pieces)
Min. 24 V
and turn it to START and carry out troubleshooting in each case.
H15 (male) Starting switch
without turning starting switch ON.
S14 (female)
without turning starting switch ON.
R06 (male), R07 (male)
Between (1) – (2)
Between (3) – (4)
Between (3) – (5)
nected), then turn starting switch to START and carry out trou-
bleshooting.
Safety relay terminal
Power supply
Between R
Generation input
(R17-2) – E
Between S
Starting input
(R17-1) – E
Starting output
UEN00244-02
Electrolyte specific gravity
(1 piece)
Min. 1.26
Resistance
OFF Min. 1 Mz
Max. 1 z
START
Lock lever Resistance
Free Min. 1 Mz
Max. 1 z
Lock
Resistance
300 – 600 z
Max. 1 z
Min. 1 Mz
Voltage
20 – 30 V
Max. 1 V
20 – 30 V
20 – 30 V
1
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