TM 55-1930-209-14&P-21
Section VII. Alternator and Voltage Regulator
5-25 General
a.
Alternator
(1) The alternator assembly is hinge-mounted on left side of diesel engine. It is belt-driven from an
accessory pulley driven from balance shaft. See figure 5-5.
(2) The alternator is a Delco "Delcotron" heavy-duty unit. The shaft rotates in a roller bearing at slip ring end
and a ball bearing at driving pulley end. Bearing grease reservoirs contain enough lubricant to eliminate need for
periodic lubrication. Two brushes carry current through two slip rings to field coil mounted on rotor.
(3) No periodic adjustment or maintenance is required on alternator assembly.
b.
Stator. The stator windings are assembled on inside of a laminated core that forms part of alternator frame.
Rectifier bridge is connected to stator windings contains six diodes, and electrically changes stator ac voltages to a dc
voltage which appears at alternator output terminal. Alternator field current is supplies through a diode trio which also is
connected to stator windings. Condenser, mounted in end frame, protects rectifier bridge and diode trio from high
voltages and suppresses radio noise. Wiring diagram is shown in Figure 5- 6.
c.
Voltage Regulator
(1) Voltage regulator is mounted inside alternator slip ring and frame.
(2) Voltage regulator is a sealed solid-state unit and is not repairable. Replace when necessary.
(3) Regulator voltage setting never needs adjusting, and no provision for adjustment is provided.
5-17
