1---5
circuit breaker opens at 20 amps and will automatically
reset.
e. Circuit Breaker (CB---3)
The circuit breaker is located above CB---2 in the
control box. This device prevents excessive current draw
by the glow plug circuitry. The circuit breaker opens at 45
amps and will reset automatically.
1.8 LUBE OIL AND FUEL FLOW DIAGRAMS
1
10
9
7
8
6
5
4
3
2
11
1. Fuel Tank
2. Mechanical Lift Pump
3. Fuel Warmer
4. Primary Filter
5. Secondary Filter
6. Fuel Bleed Valve
7. Injection Pump
8. Nozzle Holder
9. Leak---Off Line
10. Fuel Return Line
11. Sight Glass
Figure 1---4. Fuel System Diagram
1
2
3
4
5
6
1. Engine block
4. Oil pressure sender
2. Oil pan
5. Oil pressure switch
3. Full flow filter
6. Engine block oil
connections
Figure 1---5. Lube Oil Flow Diagram
1.9 BATTERY CHARGING ALTERNATOR
SYSTEM
1.9.1Introduction
Table 1---3. Alternator and Manuals
Motorola
Motorola
Amps
Alternator No.
Manual No.
8EM2012NA
25---197
65
It is recommended that the applicable manual (see
chart above) be obtained from
Motorola Inc., 4000
Commercial Avenue, Northbrook, Illinois 60062, U.S.A.
,
for complete overhaul and service information of the
alternator, and regulator, if required.
The mechanical construction of the alternator differs
from the d---c generator in that the field rotates and the
(armature) generating windings are stationary. The field
current necessary to control the output of the alternator
is supplied from the solid---state regulator. This integral
voltage regulator, which incorporates an IC, all silicone
semiconductor and thick---film construction, controls the
current feed to the field via the brushes and rotor slip
rings.
Two completely sealed ball bearings support the rotor
in the front and rear housing.
1
2
3
4
5
6
7
1. AC Tap
2. Back Cover
3. Positive Output(B+)
4. Integral Regulator
5. Excite
6. Ground
7. 12vdc Test Lamp
Terminal (D+)
Figure 1---6. Alternator and Regulator
CAUTION
Observe proper polarity when installing battery,
negative battery terminal must be grounded.
Reverse polarity will destroy the rectifier diodes
in alternator. As a precautionary measure,
disconnect positive battery terminal when
charging battery in unit. Connecting charger in
reverse will destroy the rectifier diodes in
alternator.
1.9.2Alternator Operation
The alternator converts mechanical and magnetic
energy to alternating current (A.C.) and voltage, by the
rotation of an electromagnetic field (rotor) inside a three
phase stator assembly. The alternating current and
voltage is changed to direct current and voltage, by
passing A.C. energy through a three phase, full---wave
rectifier system. Six silicon rectifier diodes are used. (see
Figure 1---7)
1.9.3Integral Voltage Regulator Operation
(12 volts d---c)
The regulator is an all---electronic, transistorized
device. No mechanical contacts or relays are used to
perform the voltage regulation of the alternator system.
The electronic circuitry should never require adjustment
and the solid state active elements used have proved
reliable enough to warrant a sealed unit. The system is
temperature compensated to permit the ideal charging
rate at all temperatures.
The regulator is an electronic switching device. It
senses the voltage appearing at the auxiliary terminal of
the alternator and supplies the necessary field current for
maintaining the system voltage at the output terminal.
The output current is determined by the load.