Figure 1-4. Hydraulic System Diagram

TM 10-3930-623-34

A zener diode, driver transistor, capacitor, and

enough to jump the spark plug gap, providing ignition; a

resistors act together as the electrical control portion of

distributor which times the occurrence of the spark at the

the regulator to electrically switch the output transistor

cylinder and directs each high voltage pulse to the

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

proper cylinder in firing order of the engine; a set of

compensated voltage setting which is matched to the

spark plugs and all connecting leads.

charging requirement characteristics of the battery.

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

1-15. DELETED

Delco-Remy enclosed shift starter motor using a

solenoid shifted overrunning clutch drive. The starter is

operated from the instrument panel by a push button

switch.

A neutral safety switch operated by the

transmission shift linkage is installed in the starter

control circuit. This switch is closed only when the

transmission is in neutral, to permit starting only at that

time. These trucks also have a starter lockout solenoid

in the control circuit to prevent accidental operation of

the starter while the engine is running.

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

conventional high tension battery powered system

modified to meet radio interference suppressed

requirements.

The system includes an ON-OFF

switch on the instrument panel; a high tension coil, which

transforms the low voltage of the battery to voltage high

Figure 1-4. Hydraulic System Diagram

1-4