TM 5-3805-291-10
THEORY OF OPERATION - CONTINUED
0003 00
BRAKE SYSTEMS
0003 00
1.
Service Brakes.
a.
An engine-mounted, gear-driven pump provides hydraulic pressure for the service brakes. The service brakes are a
wet brake system mounted to the planetary.
b.
Two service brake pedals operate a hydraulic valve, which directs hydraulic pressure through hydraulic lines for
engaging multiple oil disc brake assemblies for each wheel.
c.
The brake system has two accumulators, which ensure proper brake pressure is maintained.
2.
Parking Brakes.
a.
The parking brake is engaged via a switch on the dash in the cab.
b.
If service brakes are lost, the parking brake can be applied to aid in stopping the machine.
ELECTRICAL SYSTEM
0003 00
1.
The electrical system consists of two 12V batteries connected in series-parallel with negative grounding, providing 24V
to operate the electrical systems and components.
a.
Standard machines have two batteries with a Cold Cranking Amps (CCA) rating of 1,400 each.
b.
Arctic operation machines have four batteries. Two have a rating of 1,400 CCA each and two have a rating of
1,000 CCA each.
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 Messenger system allows the operator to view critical parameters that directly affect machine performance.
4.
The following major systems comprise the electrical system:
a.
Starting system
b.
Charging system
c.
Electronic engine, transmission, and machine system controls
d.
e.
Service, work, and blackout lights
HYDRAULIC SYSTEM
0003 00
General. A main hydraulic pump driven by the engine provides power for steering and earthmoving equipment opera-
1.
tion.
2.
Steering System.
a.
The machine's hydraulic steering system changes the machine's angle of articulation.
b.
Major components of the steering system are piston pump, metering pump, steering cylinders, and lines and fit-
tings.
c.
Two steering cylinders mounted to the loader rear frame section turn the front wheels. The cylinders are powered
by the hydraulic system and controlled by the steering wheel.
d.
In the event of primary steering system failure, a secondary system automatically activates. An electric supplemen-
tal steering pump provides emergency steering power.
0003 00-2
