Case 580SR Service Manual page 962

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134 SECTION 55 - ELECTRICAL SYSTEM
5. STARTING SYSTEM
5.1 DESCRIPTION AND OPERATION
The system includes a key switch, a reinforcedwir-
ing, a starter motor and a relay-solenoid valve as-
sembly.
This is a starter motor with built-in solenoid and pos-
itive engagement drive system.
When the key switch is operated with the forward
and reverse travel lever in the neutral position, the
solenoid windings are energized and cause the mo-
bile core to be drawn inside the solenoid.
This movement causes the drive pinion to mesh with
the ring gear on the engine flywheel. When the ring
gear and the drive pinion are engaged, the mobile
core of the solenoid closes a series of contacts ena-
bling the battery to power the field coils directly and
provide the entire power to the starter motor.
The starter motor contains only a single set of con-
tacts and a mobile core, which closes the contacts
completely, even if the teeth of the drive pinion and
the gear are not aligned. In this case, a spring is
compressed and forces the complete engagement of
the pinion as soon as the starter motor starts rotat-
ing.
Once the ignition is turned off, the solenoid and the
starter motor are de-energized. The solenoid's recoil
spring causes the drive pinion to be uncoupled and
the contacts of the solenoid to reopen.