TM 5-3805-293-10
0003
ELECTRICAL
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1. The electrical system, interruptible by a lockable battery disconnect switch, consists of two 12V batteries con-
nected in series with negative grounding, providing 24V to operate the electrical systems and components.
2. The system contains all the necessary switches, circuit breakers, fuses, relays, harnesses, and connectors to
operate the machine, including a NATO slave receptacle.
3. The major systems comprising the electrical system are:
a. Starting system.
b. Charging systems.
c.
Messenger display system.
d. Service, work, and blackout lights.
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1. General. The hydraulic system is comprised of a single fluid tank, an implement and steering pump, a brake
and hydraulic fan pump, a secondary steering pump, and a set of bank valves to distribute hydraulic fluid
pressure to the various hydraulically activated systems (braking, steering, articulation, wheel lean, and earth
moving components). The system also contains various control valves, check valves, sensors, and
accumulators to maintain correct pressures. The fluid tank with a sight glass to check fluid level is located
behind the left rear access door. A hydraulic fluid cooler is located in front of the radiator.
2. Steering System. The steering system utilizes hydraulic pressure produced by the implement and steering
pump to actuate steering cylinders. An electric secondary hydraulic steering pump, located below the cab,
provides hydraulic steering pressure in the event of implement and steering pump failure.
3. Steering Cylinders. There are two steering cylinders mounted at the front axle that turn the front wheels. The
cylinders are powered by the hydraulic system and controlled by the steering pump and joystick controls.
4. Wheel Lean Cylinder. The wheel lean cylinder is mounted on the right side of the front axle. It is powered by
the hydraulic system and controlled by a switch on the left joystick. The function of the wheel lean cylinder is to
set the front wheels at an angle. This counteracts blade pressure exerted sideways against the front wheels
when grading or moving heavy material. The wheel lean cylinder also sets front wheel angle to prevent the
front of the machine from slipping sideways and downward when the machine is moving across a slope.
5. Ground Engagement Tools. The scarifier height, blade height, rotation, tilt, sideshift, centershift, and angle
are all hydraulically powered and controlled using joysticks and joystick controls.
6. Brake System. The service brakes are hydraulically activated by pressing down on the foot pedal in the cab.
Hydraulic pressure is provided by the engine driven fan and brake pump located behind the left front access
door. The parking brake is spring actuated and hydraulically released via a switch located on the right side of
the instrument panel activated by the operator.
7. All-Wheel Drive (AWD). All-wheel drive provides machine propulsion to the front tires when commanded by
the operator. The AWD control is located on the right-side control panel. All-wheel drive can be operated in
either CREEP or MANUAL mode by providing hydraulic fluid pressure to hydraulic motors at the front wheels.
When in CREEP mode, the machine is propelled only by the front wheels. Speed in CREEP mode is variable
from 0 to 5 mph (0 to 8 km/h). In MANUAL mode, the front wheels can be commanded to run at 99 percent,
100 percent, or 120 percent of rear wheel speed.
END OF WORK PACKAGE
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