Electrical Equipment; General Information - Perkins 2800 Workshop Manual

2800
14

Electrical equipment

14

General information

This section includes the components which form part of the battery charging circuit and the engine starting
circuit: the alternator and starter motor.
A brush-type alternator is fitted at the front of the engine. The alternator unit is driven by a single belt from the
fan pulley. The output, 24 volts/70 amps, is controlled by an integral regulator.
The 24 volt starter motor is mounted on the flywheel housing and, when operated, rotates the engine flywheel
at a speed that is fast enough to start the engine. When the engine start button is operated, a solenoid,
mounted on the starter motor, engages the starter pinion with the ring gear of the flywheel. The circuit which
operates the starter motor is completed when the pinion is fully engaged. When the circuit between the battery
and the starter motor is complete, the pinion will rotate the engine flywheel. A clutch provides protection for the
starter motor so that the engine cannot turn the starter motor too fast. When the start button is released, the
pinion is withdrawn from the ring gear.
Workshop Manual, TSD3450E, Issue 1 133