YG125-30B Maintenance Manual
Starting system
134
12.
Check switch plug of relay whether is loose.
13.
Check clutch electrical starting switch plug whether
is damaged or loose.
Major faults diagnosis
Phenomenon
Possible causes
Solutions
l
Starting relay
doesn
’
t attract;
l
No sound of relay
suction can be
heard while
pressing the start
button, and the
starting motor
doesn't run.
l
Accumulator voltage too low;
l
Corresponding fuse is not connected or is
blown;
l
The Neutral line of the shift position switch
is open circuit
l
Clutch switch open circuit failure;
l
Start button open failure;
l
Flameout switch open circuit failure;
l
Starting relay failed;
l
Related lines of the main cable are open.
l
Recharge the accumulator;
l
Connect the fuse or replace it;
l
Connect the line or replace shift
position switch
l
Connect the line or replace clutch
switch
l
Connect the line or replace the left
switch;
l
Connect the line or replace the left
switch
l
Replace the starting relay;
l
Repair or replace main cable.
l
Starting motor
doesn
’
t rotate: there
is the sound of relay
suction, however,
the motor doesn
’
t
rotate.
l
Accumulator voltage too low;
l
Heavy line connector lug slackened;
l
Motor open circuit failure;
l
Open circuit between the terminal contacts
of the starting relay;
l
Motor short circuit failure;
l
Engine clogged, motor rotation jammed.
l
Recharge the accumulator
l
Fasten the connector lug;
l
Replace the motor
l
Replace the starting relay
l
Replace the motor;
l
Check the engine.
l
Motor rotating
speed too low
l
Accumulator voltage or capacity too low;
l
Connector lug contacts poorly;
l
Starting motor
’
s output torque is
insufficient
；
l
Motor resistance too large.
l
Recharge or replace accumulator;
l
Fasten the connector lug;
l
Replace the motor;
l
Check the engine.
Summary of Contents for YG125-30B
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Page 141: ...YG125 30B Maintenance Manual Engine management system 147 Circuit schematic drawing...
Page 151: ...YG125 30B Maintenance Manual Electrical System Diagram 157 19 Electrical System Diagram...
