Section V. REPAIR OF ELECTRICAL SYSTEM COMPONENTS

TM 5-4320-234-34

To increase oil pressure, add a washer between

the spring and oil pressure regulator valve. More than four

washers should not be used. If four washers do not fulfill

the required range, either the spring is faulty or other

engine troubles exist.

After you make the adjustments, check that the

oil pressure remains in the required ranges during

operation.

Figure 3-6. Oil pressure adjustment.

Section V. REPAIR OF ELECTRICAL SYSTEM COMPONENTS

engine operating speeds could severely damage the

3-16. Description of Engine Electrical System

starting motor. Reengagement of the starter while the

engine is running is prohibited by the starter disengage

The alternator and regulator are typical

relay.

automotive types in which the alternator output is

controlled through the voltage regulator, depending

3-17. Alternator

upon the state of charge of the battery. When the

battery charge is low, the voltage regulator increases the

strength of the alternator field to increase the output of

CAUTION

the alternator. When the battery charge is

normal, the output of the alternator decreases to near

Disconnect the battery cable from the

zero.

positive

battery

terminal

before

disconnecting any other leads from the

Reversed polarity connections in the

engine components. This precaution will

charging system can severely damage the alternator.

prevent shorts which could damage the

To prevent this damage, the system is protected by a

alternator, voltage regulator, or other parts.

reverse polarity protector mounted on the voltage

regulator bracket.

Removal. Remove the alternator as directed

in TM 5-4320-234-12, para 4-38.

The engine starter is a solenoid-operated

type in which the solenoid switch is mounted on the top

Alternator Brush Replacement.

of the starter. The solenoid switch uses electrical

energy to pull the starter drive into engagement with the

(1) Remove the two assembled washer

flywheel ring gear and to form the electrical circuit which

screws (4, fig. 3-7) that secure the brush cover (5) to

energizes the starter after the drive is engaged. When

the alternator; carefully pull the cover away from the

the engine starts, the starter drive is disengaged,

alternator.

preventing the engine from driving the starter since

3-8