Starting Motor - TM-5-4320-234-340060

TM 5-4320-234-34

Figure 3-12. Voltage regulator adjustment circuit.

cover and screws. Reconnect the field, and operate for

(2) Operate the engine at fast idle (700 to

no more than 5 minutes to ensure that you have

1000 rpm) to stabilize the electrical system until the

obtained the desired change in voltage.

voltmeter stops showing a charge. This should occur

between 5 to 15 minutes.

3-19. Starting Motor

(3) Leave the engine running and remove

bakelite covered field connector on back of alternator.

CAUTION

Remove the four cover screws and remove cover from

voltage regulator. Reconnect the field to the alternator.

Disconnect the battery cable from the

positive

battery

terminal

before

CAUTION

disconnecting any other electrical leads

from the engine components. This will

The variable voltage control is connected

prevent shorts which could damage the

to alternator output and is electrically hot.

alternator, voltage regulator, and other

Do not let adjustment tool touch anything

parts.

but voltage control.

Removal. Remove the starting motor (TM 5-

(4) Use a No. 2 Phillips screwdriver to

4320-12, para 4-42).

adjust the voltage control. Turn the control a few

degrees counterclockwise if you want to reduce voltage,

Pinion Clearance Check. After removing the

or turn it clockwise to increase voltage. Stops are

starting motor, check pinion clearance. The clearance

provided in the control to limit rotation to less than 1/2

cannot be adjusted, but improper clearance will indicate

turn total. Do not try to force control beyond stops.

worn parts and the need for starting motor replacement.

To check the pinion clearance, refer to figure 3-13 and

(5) After

adjustment,

remove

field

proceed as follows:

connector on back of alternator. Reinstall the regulator

3-15