Figure 1-4. Hydraulic System Diagram

TM 10-3930-623-12

5. A zener diode, driver transistor, capacitor, and

the engine is running.

resistors act together as the electrical control portion of

the regulator to electrically switch the output transistor

1-14. IGNITION SYSTEM. The ignition system is a

"on" and "off". A thermistor provides a temperature

conventional high tension battery powered system,

compensated voltage setting which is matched to the

modified to meet radio interference shielding

charging requirement characteristics of the battery.

requirements, or radio interference suppressed, The

system includes an ON-OFF switch on the instrument

1-13. STARTING SYSTEM. The trucks are fitted with a

panel; a high tension coil, which transforms the low

Delco-Remy enclosed shift starter motor using a

voltage of the battery to voltage high enough to jump the

solenoid shifted overrunning clutch drive. The starter is

spark plug gap, providing ignition; a distributor which

operated from the instrument panel by a push button

times the occurrence of the spark at the cylinder and

switch.

A neutral safety switch operated by the

directs each-high voltage pulse to the proper cylinder in

transmission shift linkage is installed in the starter

firing order of the engine; a set of spark plugs and all

control circuit. This switch is closed only when the

connecting leads.

transmission is in neutral, to permit starting at that time.

The trucks also have a starter lockout relay in the control

1-15. DELETED

circuit to prevent accidental operation of the starter while

Figure 1-4. Hydraulic System Diagram

1-4