1399733 ENGINE AR-COMPLETE Caterpillar parts C-12 ENGINE
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TRUCK ENGINE C-12 Caterpillar
Illustration 1 g03815580
Right Console (front) (1) Brake relay number-one (2) Brake relay number-two (3) Neutral relay number-one (4) Machine fuse (5) Control fuse (6) Pull-up resistor (7) Shutdown status fuseFuses and relays that are part of the propel system are contained in two fuse blocks. These fuse blocks are located behind a cover plate (shown removed) at the front of the right operator console. Note: The above photo shows the lower fuse block with the plastic dust cover removed.Brake relay number-one (1), brake relay number-two (2), and neutral relay number-one (3) work with the parking brake switch. Interaction between these relays prevents release of the parking brake when the brake is engaged and the propel lever is out of the NEUTRAL position.Machine fuse (4) provides power to the neutral start switch. Control fuse (5) provides power to the following components:
The operator display
The parking brake switch
Neutral relay number-one (3) Pull-up resistor (6) is connected to the hydraulic filter bypass switch. The resistor is rated at 2 kiloohms.Shutdown status fuse (7) provides power to the backup alarm relay.
Illustration 2 g03815611
Right Console (front) (8) Backup alarm relayBackup alarm relay (8) is the top relay in the upper fuse block.Note: The above photo shows the upper fuse block with the plastic dust cover removed.Backup alarm relay (8) works with the reverse switch and the backup alarm.
Illustration 3 g03815613
Rear of Machine (9) Backup alarmBackup alarm (9) is mounted on the lower corner of the rear compartment door. The door must be open to access this component.The backup alarm relay controls the power supply to backup alarm (9). When the propel lever is in the reverse range, the reverse switch is closed. In this case, the backup alarm relay is energized and the backup alarm sounds.
Illustration 4 g03815614
Right Side of Machine (10) Interlock solenoidPropel interlock solenoid (10) is located on the right side of the machine. The engine compartment cover provides access to this component.The parking brake switch controls interlock solenoid (10). When the parking brake is engaged, this solenoid is not energized. When the parking brake is released, the interlock solenoid is energized.When interlock solenoid (10) is energized, charge oil is available at the propel pump control valves and the piston of the parking brake. When the solenoid is not energized, charge oil to the pump control valves and the parking brake is blocked and vented to tank. Under these conditions, the hydrostatic drive loop is disabled, and the parking brake is engaged.
Illustration 5 g03815620
Right Side of Machine (11) Test manifold (12) Port "AF" (13) Port "DF" (14) Port "DR" (15) Port "AR"Test manifold (11) is located on the right side of the machine. The engine compartment cover provides access to this component.The forward circuit of the axle and drum propulsion system is connected through an orifice in test manifold (11). The reverse circuit of the axle and drum propulsion system is also connected by an orifice in this manifold.The orifices allow oil to transfer between the drum and axle propel circuits. This oil transfer modulates the pressure