109823_2/09 5-19
Trouble shooting
Symptom Part Cause Remedy
Wiring Open circuit: loose battery connection,
loose connection at ignition switch or at
starter terminals.
Tighten connections.
Pinion does not advance
even though the key
switch is turned ON.
Key switch Defective ignition switch Replace
Starting motor Helical spline on pinion shaft is scored
and prevents the pinion from moving
Replace or correct
Magnet switch Improper movement of the plunger of the
magnet switch or disconnected wire or
short circuit of the coil.
Replace or correct
Pinion is engaged, the
motor rotates, but rota-
tion is not transmitted to
the engine.
Starting motor Defective clutch or broken reduction gear. Replace
Wiring Wire from batter to magnet switch discon-
nected. Loose connection between
magnet switch and motor.
Repair, retightening, or
replace the wire.
Locked ball bearing. Replace
Improper installation. Replace
Starting motor Worn out brush, improper contact of
brush spring.
Correct
Pinion is engaged with the
ring gear, starting motor
does not turn.
Stained commutator. Replace
Defective armature or field coil. Replace
Insufficient tightening of connections of
the field coil and brush
Replace
Broken holding coil Replace
Magnet switch Improper contact of contact Replace
Roughened contact surface of contact Replace
Battery Discharged Charge
Improper sliding of pinion shaft Replace
Starting motor Worn out pinion tooth top Correct
Motor starts rotating before
the pinion is engaged
with the ring gear.
Improper pinion pushing position Replace
Engine Worn out ring gear Replace
Magnet switch Defective magnet switch Replace
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