Case 580SR Service Manual page 971

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FAULT FINDING
The starter motor does not run
(the magnetic switch makes no
operating noise)
The starter motor does not run
(the magnetic switch makes an
operating noise)
The starter motor runs too slowly
The starter motor running cannot
crank the engine
Anomalous noise
Pinion gear springing out
Field coil loss
Magnetic switch coil burnt, etc.
SECTION 55 - ELECTRICAL SYSTEM
PROBLEM
Poor battery specific gravity and
level
Poor ignition switch circuit
connection or contact
Malfunction of the coil or of the
magnetic switch pull-in piston.
Poor battery specific gravity and
level
Poor start-up circuit contact
Poor magnetic switch contact
Motor assembly malfunction (e.g.
layer short, brush wear)
Poor magnetic switch contact
Motor assembly malfunction (e.g.
layer short, brush wear)
Pinion gear does not engage with
ring gear
Clutch sliding
Abnormal bushing wear
Wear on pinion gear or ring gear
tooth tips
Poor pinion gear sliding
Poor ignition switch return
Pinion gear disengagement fault
caused by a coil short circuit in
the magnetic switch.
CAUSE
Inspect the battery.
Replace the wiring harness and the
ignition switch.
Replace the magnetic switch.
Inspect the battery.
Repair the wiring harness.
Replace the magnetic switch.
Repair or replace the motor
assembly.
Replace the magnetic switch.
Repair or replace the motor
assembly.
Repair or replace the clutch and the
control lever.
Replace the clutch.
Replace the bushing.
Replace the clutch and the ring gear.
Lubricate or replace the clutch.
Replace the ignition switch.
Replace the magnetic switch.
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CORRECTION