TM 55-1730-229-12
AG 320A0-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
(3) Connect main harness connec-
Install.
c.
tors to control panel connectors 1J5,
(1) Position control panel (4,
1J6, and 1J7.
figure 4-13) with lower edge of panel
(4) Raise panel into position and
resting on ledge beneath panel opening
secure with four washers (3) and screws
in rear of AGPU.
(2).
(2) Attach support cable (5) to
control panel using washers (7) and nut
(5) Install battery charger access
cover (paragraph 4-15).
(6).
Section XVIII. MAINTENANCE OF PROPULSION SYSTEM
the rear wheels. The brakes are set by a
lever (11) on the front of the AGPU
ing, brakes, and drive power for the
which is connected to the brake assem-
AGPU. A speed/direction control assembly
blies by a cable assembly (9).
(12) mounted on a tow bar (13) allows
the operator to control the forward/
a. Motor Controller. The motor con-
reverse directions and speed (up to 3
troller (18) and the forward and reverse
mph on flat surface) in self-propulsion
relays are mounted on the upper tray in
mode. The tow bar is also used to steer
the electrical compartment. The motor
AGPU when using self-propulsion
the
controller receives +28 vdc from the
mode. Drive power is provided by a dc
control panel and control signals from
traction motor (8) driving a conven-
the speed/direction control unit. It
tional rear axle assembly. An electric
sends dc drive voltage to the traction
brake assembly (22) is provided. Appli-
motor armature and speed control signals
to the traction motor field windings.
cation of dc drive power to the traction
motor is controlled by a motor control-
The control signals from the speed/
ler (18) and relays located on the upper
direction control assembly consist of
tray in the electrical compartment. The
forward or reverse relay activation
motor controller receives signals from
signals from internal micro switches and
the speed/direction control assembly.
variable speed control signals from the
The drive train consists of a gear box
internal variable resistors. Both sets
(7), a chain drive (6), a manual clutch
o f signals are selected by the twist
(5), and a rear axle assembly (2). A
grips.
dead man switch (19) on the speed/
direction control assembly must be held
b. Speed/Direction Control Assembly.
in while operating the propulsion system.
(See figure 4-84.)
The speed/direction
If the switch is released (intentionally
control assembly
provides both
the
or accidentally) during operation, power
direction (forward and reverse) and the
is removed from the traction motor and
speed commands to the AGPU propulsion
the electric electric brake. Removing
motor. The assembly mounts on the tow
electrical power applies the electric
bar (1), close to the lunette eye. It is
brake. Additionally, the speed/direction
connected to the motor by a wiring har-
control assembly contains a
mercury
ness that runs under the tow bar and is
switch which deactivates the propulsion
protected by the tow bar
channel.
system when the tow bar is raised. Con-
Forward and reverse selection as well as
speed are determined by the position
ventional drum brakes are provided on
Change 2
