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TM 10-3930-643-20
INTRODUCTION.
1-16.
Electrical System.
The electrical system is a 24 volt, negative ground
system.
For illustrations, refer to specific maintenance tasks.
a. Alternator. The engine drives the alternator to a speed sufficient to
provide the electrical energy for the normal demands of the system. A portion
of this energy is sent to the batteries to keep them fully charged.
b.
Drive Belts.
Driven by crankshaft pulley, keyed to the crankshaft and
held in place by a retainer plate.
c .
Starting Motor.
Electric with overrunning clutch.
Solenoid mounted on
starter with engaging mechanism enclosed in the housing.
Starting motor will
only engage when master disconnect switch is “ON”.
d.
S l a v e S t a r t i n g R e c e p t a c l e . A l l o w s v e h i c l e t o b e s t a r t e d f r o m an
external 24 volt electrical source.
e . L i g h t s
Mounted forward on the vehicle cab or ROPS are two lower
service lights and two upper headlights. One blackout light is mounted on
top
of the left hand headlight bracket.
Mounted in the grille at the rear are two
service lights, two stop and taillights, and two blackout stop and taillights.
Front and rear service lights are controlled by individual switches mounted on
the operator’s console panel.
O p e r a t i o n o f o t h e r l i g h t s i s c o n t r o l l e d b y a
vehicle light switch assembly mounted on the right side of the control console,
refer to TM 10-3930-643-10 for light location and operation.
f .
Switches and Sending Units.
Name of Unit
Location
(1)
(2)
(3)
(4)
(5)
( 6)
Low Air Pressure Switch.
Located on back of air pressure gage.
Stop Light Switch.
On front of left hand pressure
Brake Warning
Ground Driven
Switch.
converter.
Switch.
On the side of each pressure
converter.
Steering
Located on left hand side of ground
driven steering pump.
Converter Temperature
On the left hand front of the torque
Sending Unit.
converter.
Hydraulic Filter Switch.
On the side of the hydraulic oil
filter on the back of the hydraulic
r e s e r v o i r .
1-13
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