THEORY OF OPERATION - CONTINUED
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. The accumulators are
located on the right-hand side of the machine, directly behind the cab.
a. The parking/emergency brake located in the transmission case is cable engaged via a parking brake lever in the cab.
b. Whenever the parking brake is engaged, the transmission returns to N (NEUTRAL).
c. If service brakes are lost, the parking brake can be applied.
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 batteries with a Cold Cranking Amps (CCA) rating of 1,000 each.
b. Arctic operation machines have batteries with a rating of 1,400 CCA each.
There is a 24V to 12V converter used to supply power for the 12V fuel transfer pump.
The system contains all the necessary switches, circuit breakers, fuses, relays, harnesses, and connectors to operate the
machine, including a NATO slave receptacle.
A Machine Monitor System (MMS) provides immediate indication to the operator of machine status or system malfunc-
tions. The MMS includes instrument panel alert indicators, action alarm, and action lamp.
The following major systems comprise the electrical system:
a. Starting system.
b. Charging system.
c. Electronic engine, transmission, and machine system controls.
e. Service, work, and blackout lights.
General. A main hydraulic pump driven by the engine provides power for steering and earthmoving equipment opera-
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 fittings.
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 supplemental
steering pump provides emergency steering power.