Figure 39. Electrical starting circuit.

TM 10-3930-222-20

Figure 39. Electrical starting circuit.

down until the correct airgap reading of

42. Engine Voltage Regulator

0.020 inch is obtained.

Tighten the

armature mounting screws and recheck

Refer to figure 43 and remove the regulator as

airgap.

follows:

(b) Point opening. Check the point opening and

a. Removal.

adjust as shown in figure 45 to a correct reading

(1) Disconnect and tag the generator and field wires

of 0.020 inch by bending the upper armature

and the battery lead at the regulator.

stop.

(2) Remove the capscrews and lockwashers that

secure the regulator to the bracket and remove

11.8 to 13.5 volts. Hook up the test equipment

the regulator.

(fig. 46) and adjust the closing voltage as

shown in figure 47 by turning the adjusting

b. Installation. Reverse procedures in a above.

screw. Turn the screw clockwise to increase

spring tension and closing voltage; turn the

c. Testing and Adjusting.

screw counterclockwise to descrease spring

(1) Cutout relay. The cutout relay requires three

tension and closing voltage.

checks and adjustments, as follows:

(2) Voltage regulator. The voltage regulator requires

(a) Airgap. With the battery disconnected,

two checks and adjustments as follows:

press the armature down as shown in

(a) Airgap. With the battery disconnected, check

figure 44 until the points just close and

the airgap for a read ing of 0.075 inch. If

measure the airgap between the armature

adjustment is needed, use a 3/8-inch box-en(

and the center of the core. If adjustment

is required, loosen the two armature

screws and move the armature up or