Case 580SR+ - Page 971

SECTION 55 - ELECTRICAL SYSTEM 143
FAULT FINDING
PROBLEM CAUSE CORRECTION
The starter motor does not run
(the magnetic switch makes no
operating noise)
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.
Inspect the battery.
Replace the wiring harness and the
ignition switch.
Replace the magnetic switch.
The starter motor does not run
(the magnetic switch makes an
operating noise)
Poor battery specific gravity and
level
Poor start-up circuit contact
Poor magnetic switch contact
Motor assembly malfunction (e.g.
layer short, brush wear)
Inspect the battery.
Repair the wiring harness.
Replace the magnetic switch.
Repair or replace the motor
assembly.
The starter motor runs too slowly Poor magnetic switch contact
Motor assembly malfunction (e.g.
layer short, brush wear)
Replace the magnetic switch.
Repair or replace the motor
assembly.
The starter motor running cannot
crank the engine
Pinion gear does not engage with
ring gear
Clutch sliding
Repair or replace the clutch and the
control lever.
Replace the clutch.
Anomalous noise Abnormal bushing wear
Wear on pinion gear or ring gear
tooth tips
Poor pinion gear sliding
Replace the bushing.
Replace the clutch and the ring gear.
Lubricate or replace the clutch.
Pinion gear springing out
Field coil loss
Magnetic switch coil burnt, etc.
Poor ignition switch return
Pinion gear disengagement fault
caused by a coil short circuit in
the magnetic switch.
Replace the ignition switch.
Replace the magnetic switch.
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