TM
55-1730-229-42
AC
320A0-OMM-000
TO
35C2-3-473-1
TM
1730-12/1
The exciter voltage is half-wave rectified and applied to the
ing with the clutch engaged until electrical power is applied
to the traction motor and electric brake. Application of dc
phase voltage generated in the main stator windings is a
drive power to the traction motor is controlled by a motor
function of the ampere turns of the field windings which is,
controller and relays located on the upper tray in the electri-
in turn, a function of the exciter field excitation The GCU
cal compartment. The motor controller receives signals
monitors the generator ac or dc output (depending upon
from the speed/direction control assembly. The drive train
which output is selected at the AGPU control panel) and
consists of a gear box, a chain drive, a manual clutch, and a
controls the exciter field as required to keep the selected
rear axle assembly. A dead man switch on the speed/direc-
output within limits.
tion control assembly must be held in while operating the
propulsion system. If the switch is released (intentionally or
accidentally) during operation, power is removed from the
e. Hydraulic System. The hydraulic system, figure
traction motor and the electric brake. Removing electrical
power applies the electric brake. Additionally, the speed/
and hoses, and a hydraulic module. The hydraulic pump is
direction control assembly contains a mercury switch which
mounted on an engine gearcase pad, and is driven by the
deactivates the propulsion system when the tow bar is
engine. The hydraulic pump output pressure is controlled
raised. Conventional drum brakes are provided by the rear
by a switch on the hydraulic control panel. The hydraulic
wheels. The brakes are set by a lever on the front of the
module controls the application of hydraulic fluid to an
AGPU, which is connected to the brake assemblies by a
aircraft for power, filling, or flushing requirements. The
cable assembly
hydraulic module contains a control panel, a reservoir, an
accumulator, a cooler (heat exchanger), a manifold, filters
(2), and hydraulic lines, fittings, and valves.
g. Pneumatic System. The pneumatic
provides pneumatic power (60 pounds/minute, at psig).
The pneumatic system consists of a load control valve
f. Propulsion System. The propulsion system, figure
(LCV) mounted on the engine, ducts, and a pneumatic hose
power for the AGPU. A speed/direction control assembly
with some units. The kit consists of a fifty-foot hose as-
mounted on a tow bar allows the operator to control the
sembly, a supply valve, and a deicer nozzle assembly. The
forward/reverse directions and speed (up to 3 mph on flat
supply valve connects to a normally capped outlet on the
surface) in self-propulsion mode. The tow bar is also used
left interior bulkhead of the AGPU.
to steer the AGPU when using self-propulsion mode. Drive
power is provided by a dc traction motor driving a conven-
tional rear axle assembly. An electric brake assembly is
provided. The electric brake prevents the rear wheels turn-
tained in table l-l. Refer to table 1-2 for stencilling
nomenclature and instruction plates, and table 1-3 for
torque specifications.
