Case 580SR Service Manual page 963

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5.2 FAULT FINDING
The motor does not start when the starter switch key is operated and the transmission is in the neutral position.
Is the battery properly charged?
Check the starter motor wiring. Are there bad connections,
cut or stripped cables?
Is the starter motor seized?
Operate the key switch. Is there a
voltage of +12 V on the (white) wire at
the input of the starter motor solenoid
(terminal 30)?
Check the starter motor relay (K01). Can you
hear the relay operate after operating the
starter switch key?
Remove the connector from the relay (K01). Is there a voltage of
+12 V at terminal 86 (white/black) after the starter switch key is
Check the starter motor safety relay (K3). Can one hear the relay
operate after operating the reverse travel lever?
Remove the connector from relay K3. Is there a voltage of +12 V
at terminal 86 (white/black) after the reverse travel lever is oper-
Are the cable wires of the reverse travel lever properly con-
nected?
Does the reverse travel lever switch operate correctly?
Are the indicators on the instrument panel correctly lighted
after operating the key switch?
Are the cable wires of the key switch connected cor-
rectly?
Replace the key switch.
SECTION 55 - ELECTRICAL SYSTEM
NO
YES
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
Charge or replace the battery
YES
Repair or replace the starter motor
Does the solenoid
YES
make a "clicking"
NO
NO
NO
NO
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Repair or replace the cables
Windings, brush or starter
motor mechanism possibly
YES
defective.
Solenoid possibly defective.
Remove the starter motor
and inspect
Replace the relay
YES
Replace the relay
YES
Reconnect the wires to the switch
Replace the switch Replace the switch
NO
Check the main power supply
between the battery and the
starter motor key. Pin 2 (red
wire) of the ignition key connec-
tor.
Reconnect the wires to the key switch
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