Cub Cadet Yanmar 3TNV72 - Manual (Page 220)

STARTER MOTOR
TNV IDI Service Manual 10-7
Starter Motor Troubleshooting
STARTER MOTOR TROUBLESHOOTING
Is the shift lever at NEUTRAL
position?
Does engine crank?
Engine does not stop even when key switch is turned OFF
.
Is battery fully charged and terminals clean?
Is revolution normal? Engine does not start?
YES
NO NO
YES
NO (slow revolution)
NO
YES
Inspect fuel system.
Inspect condition of engine.
Move shift lever to NEUTRAL
position.
Pinion roller clutch or reduction gear damaged. Inspect and replace.
•
Charge or replace battery
.
• Clean
terminals.
•
Inspect brush and replace if worn.
•
If brushes are not worn, replace armature
assembly
.
Inspect wiring up to solenoid switch and repair if necessary
.
• Key
switch
• Safety
relay
• Solenoid
switch
assembly
• Electrical
connections
•
Adjust / pinion projection length.
•
Inspect shift lever for deformation, return spring for fatigue and pinion
for
sliding.
•
Repair meshing between pinion and ring gear or replace as needed.
Replace engine oil.
Repair or replace starter motor
.
Solenoid switch assembly contact defective. Repair or replace.
Repair or replace key switch, starting motor relay or magnetic switch assembly
.
If a problem occurs: Immediately disconnect battery negative terminal.
If starter motor becomes wet, replace solenoid switch
assembly even if function is normal.
YES
YES
Is starter motor operating?
YES
Pinion and ring gear meshing normal?
YES
NO NO YES
Is battery fully charged and terminals clean?
Slow Revolution
Does engine turn when starter motor is replaced?
YES
Is the engine oil viscosity correct?
NO
Is starter motor solenoid switch actuating sound heard?
NO
YES
Connect M terminal of starter motor directly to battery
.
Does starter motor operate?
NO
YES
NO
0000102
•
Charge or replace battery
.
• Clean
terminals.
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