BEARING 4598701 - Caterpillar

The alternator is driven by a belt from the pulley of the crankshaft. The alternator is three-phase and the alternator is a self-rectifying charging unit. The voltage regulator is part of the alternator.The alternator does not need slip rings and the alternator does not need brushes. The rotator assembly is the only part in the alternator that moves. The conductors that carry current are stationary. The following items are conductors: wiring, stator windings, six rectifying diodes and components of the regulator circuit.The rotor assembly has many magnetic poles. An air space is between the opposite poles. The poles have residual magnetism that produces a small magnetic field between the poles. Residual magnetism is similar to permanent magnets. As the rotor assembly begins to turn between the field winding and the stator windings, a small amount of alternating current (AC) is produced in the stator windings. The small amount of current is produced from the small magnetic lines of force. The small magnetic lines of force are made by the residual magnetism of the poles. The alternating current passes through the diodes of the rectifier bridge and the alternating current is then converted into direct current (DC).The current primarily charges the battery and the current primarily supplies the low amperage circuit. The remainder of the current is sent to the field windings (wires around an iron core). This increases the strength of the magnetic lines of force. The amount of alternating current that is produced in the stator windings increases. The increased speed of the rotor assembly increases the current output of the alternator. The increased speed of the rotor assembly also increases the voltage output of the alternator.The voltage regulator is an electronic switch. The voltage regulator consists of a transistor and stationary parts. The voltage regulator turns on and the voltage regulator turns off in order to control the field current (DC current to the field windings) for the alternator.Starting System Components
Electric Starting Motor
Illustration 3 g01383978
Components of the starting motor (18) Solenoid (19) Pinion (20) Reduction gear (21) Overrunning clutchThe starting motor has gear reduction. The starting motor is provided with a one-way roller clutch. Major components of the starting motor include the following items: motor, overrunning clutch (21) and solenoid (18) . The motor generates power. The overrunning clutch transmits torque of the armature. The overrunning clutch also limits the engine rpm after start-up. Solenoid (18) engages pinion (19) with the flywheel ring gear. Reduction gear (20) reduces the speeds of the armature and the reduction gear transmits torque to the pinion.Reduction Gear
Illustration 4 g01383983
Assembly of reduction gear (22) Armature shaft (23) Pinion (24) Overrunning clutchThe end of armature shaft (22) has a gear. The gear engages with an internal gear. The reduction gear reduces high motor speed. The reduction gear also transmits higher cranking torque to the pinion shaft.Overrunning Clutch
Illustration 5 g01383987
Components of overrunning clutch (25) Outer race (26) Inner race (27) Spring (28) RollerThe overrunning clutch has rollers. Outer race (25) and inner race (26) form