Shibaura ST318, Workshop Manual

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79
4) Troubleshooting
(1) The pinion does not move when the key switch is set to start position.
Trouble Case Remedy
Wiring Disconnection, loosened terminals of the battery or switch Repair and retighten.
Key Switch Insufficient contact. No current flows. Repair the contact area or replace
Starting motor
Pinion shaft helical spline is stucked and the pinion does not
move.
Replace or repair
Magnetic switch
Irregular movement of the magnetic switch plunger,
disconnection or short circuit of the coil.
Repair or replace
(2) Pinion is engaged, motor rotates, but the engine does not crank.
Trouble Case Remedy
Starting motor
Faulty clutch
Damaged reduction gear Replace
Replace
(3) Pinion is engaged with the ring gear but starting motor does not run.
Trouble Case Remedy
Wiring
Disconnection or breakage of the wire connecting the battery
and magnetic switch or improper grounding .
Insufficient tightening of wiring connecting the magnetic
switch and motor terminal.
Replace, retighten or correct the
wire
Starting motor
Locked ball bearing
Improper installation of the starting motor
Dirty commutator
Worn out brush, faulty contact of the brush spring
Faulty armature and field coil
Insufficent connection of the field coil and brush Replace.
Reinstall.
Correct.
Replace
Repair or replace.
Retighten
Magnetic switch
Insufficient contact of the contactor
Rough contact surface of the contactor
Broken holding coil Replace
Replace
Replace
Battery Discharged Recharge
(4) The motor rotates at full speed before the pinion engages with the ring gear.
Trouble Case Remedy
Starting motor
Improper sliding of the pinion shaft
Worn pinion gear end
Improper coming out direction of pinion Replace
Correct
Replace
Engine Worn ring gear Replace
Magnetic switch Defective switch Replace