SHAFT-PLANETARY 4V3009 - Caterpillar

The engine's electrical system contains three separate circuits:
Charging circuit
Starting circuit
Low amperage circuitThe following electrical system components may be used in more than one circuit:
Battery (batteries)
Disconnect switch
Circuit breaker
Ammeter
Cables from the battery
Wires from the batteryThe charging circuit is in operation when the engine is running. An alternator generates electricity for the charging circuit. A voltage regulator in the circuit controls the electrical output due to the need to keep the battery at full charge.
The disconnect switch, if so equipped, must be in the ON position to let the electrical system function. There will be damage to some of the charging circuit components if the engine runs with the disconnect with in the OFF position.
If the machine contains a disconnect switch, the starting circuit can operate only after the disconnect switch is moved to the ON position.The starting circuit is in operation only when the start switch is activated.Both the low amperage circuit and the changing circuit are connected to the same side of the ammeter. The starting circuit connects to the opposite side of the ammeter.Charging System Components
Never operate the alternator without the battery in the circuit. Making or breaking an alternator connection with heavy load on the circuit can cause damage to the regulator.
Alternator
Illustration 1 g00317606
Alternator (1) Regulator. (2) Roller bearing. (3) Stator winding. (4) Ball bearing. (5) Rectifier bridge. (6) Field winding. (7) Rotor assembly. (8) Fan. The alternator is driven by belts from the crankshaft pulley. This alternator is a three-phase, self-rectifying charging unit. The regulator is part of the alternator.This alternator design does not need slip rings or brushes. The only part that moves is the rotor assembly. All conductors that carry current are stationary.A list of the conductors follows:
Field winding
Stator windings
Six rectifying diodes
Regulator circuit componentsThe rotor assembly contains many magnetic poles. These magnetic poles look like fingers with air space between each of the opposite poles. The poles have residual magnetism that is similar to permanent magnets. Permanent magnets produce a small amount of magnetic lines of force (magnetic field) between the poles.As the rotor assembly begins to turn between the field winding and the stator windings, a small amount of alternating current (AC) is produced. This alternate current is generated in the stator windings from the small, magnetic lines of force. The magnetism of the pole creates the magnetic lines of force.This alternating current (AC) is changed to direct current (DC) when the alternating current (AC) passes through the diodes of the rectifier bridge. Most of this current accomplishes these two activities:
The current charges the battery.
The current supplies the low amperage circuit.The remainder is sent to the field windings.The DC current flow through the field windings (wires around an iron core) now increases the strength of the magnetic lines of force. These stronger lines of force increase the amount of alternating current (AC) that is produced in the stator windings. The increased speed of the rotor assembly also increases the current and voltage output of the alternator.The voltage regulator is a solid-state switch. These electronic