ELBOW-EXHAUST 2092080 - Caterpillar

Swing Brake
The solenoid valve for the swing parking brake is located on the pilot oil manifold. When the left joystick control is moved from the NEUTRAL position, the solenoid valve for the swing parking brake is energized. Oil flows to the swing parking brake. The swing parking brake is released. The swing parking brake is applied by a spring and hydraulically released.Note: Operation of the travel pedals will not release the swing parking brake.
Illustration 1 g01519216
Swing parking brake (disengaged position) (2) Swing parking brake (solenoid valve) (3) Spool (4) Spring (5) Passage (6) Passage (7) Port (pilot system oil) (8) Pilot oil manifold (9) Spool chamber (10) Line (11) Body (swing motor) (12) Friction plate (13) Separator plate (14) Piston chamber (15) Port (swing motor) (16) Cylinder barrel (17) Brake piston (18) Brake spring (19) Motor headThe swing parking brake is located between motor head (19) of swing motor and body (11). The swing parking brake consists of the following components: brake spring (18), brake piston (17), separator plate (13) and friction plate (12). Friction plate (12) is splined to cylinder barrel (16). Separator plate (13) is splined to body (11). Separator plate (13) and friction plate (12) move in an axial direction.When the left joystick control is moved from the NEUTRAL position, a input signal is sent to the IQAN controller. The IQAN controller sends an output signal that energizes solenoid valve (2) .When solenoid valve (2) is energized, spool (3) moves in a downward direction against the force of spring (4). Pilot oil in passage (7) flows around spool (3) to spool chamber (9) to passage (6) and line (10) to port (15) of the swing motor. The pilot oil now enters piston chamber (14). The pilot pressure causes brake piston (17) to move upward against the force of brake spring (18). The force that holds separator plate (13) and friction plate (12) together is released. When the swing parking brake is released, the swing operation of the upper structure is enabled.Note: If the swing parking brake becomes inoperable due to failure of solenoid valve (2) the swing brake can be released by turning the temporary brake release screw in a clockwise direction until the temporary brake release screw stops.
Illustration 2 g01519220
Swing parking brake (engaged position) (2) Swing parking brake (solenoid valve) (3) Spool (4) Spring (5) Passage (6) Passage (7) Port (pilot system oil) (8) Pilot oil manifold (9) Spool chamber (10) Line (11) Body (swing motor) (12) Friction plate (13) Separator plate (14) Piston chamber (15) Port (swing motor) (16) Cylinder barrel (17) Brake piston (18) Brake spring (19) Motor headWhen the left joystick control is returned to the NEUTRAL position, the IQAN controller will shut off the swing parking brake (solenoid valve) (2) .Spool (3) is moved upward by the force of spring (4). Spool (3) blocks pilot oil flow from port (7) to piston chamber (14). Brake spring (18) forces brake piston (17) downward. The oil in piston chamber (14) flows through port