TUBE AS 2807979 - Caterpillar

Side movement of joystick (1) can operate the telescoping cylinder (boom extend/retract). Side movement of the joystick can also operate the tilt cylinder when a switch on the joystick is operated.
Illustration 5 g00776155
Pilot control Valve (4) (8) Solenoid valve for tilt cylinder (coupler tilt forward) (9) Solenoid valve for telescoping cylinder (boom extend) and for tilt cylinder (coupler tilt forward) (10) Solenoid valve for telescoping cylinder (boom retract) and for tilt cylinder (coupler tilt backward) (11) Solenoid valve (differential lock control) (A2) Port to implement section of bank valve for tilt cylinder (coupler tilt forward) (B2) Port to implement section of bank valve for telescoping cylinder (boom retract) (P2) Port to port 2 on joystick control for telescoping cylinder (boom extend) or for tilt cylinder (coupler tilt forward) (B1) Port to implement section of bank valve for telescoping cylinder (boom extend) (A1) Port to implement section of bank valve for tilt cylinder (coupler tilt backward) (P1) Port to port 4 on joystick control for telescoping cylinder (boom retract) or for tilt cylinder (coupler tilt backward) (X1) Port to pilot pressure outlet of bank valve (X2) Port to the service brake system (Y) Port to differential lock control (T1) Port to hydraulic tankControls in HoldPilot pressure for operation of the tilt cylinder and the telescoping cylinder is blocked at the joystick control (1) .Telescoping Cylinder (Boom Extend)All solenoid valves de-energized. Joystick (1) is moved to the right. Pilot pressure is transmitted from the joystick to port (P2), solenoid valve (10) and port (B2) to the pilot port of bank valve (3) for the telescoping cylinder (boom extend). Telescoping Cylinder (Boom Retract)All solenoid valves de-energized. Joystick (1) is moved to the left. Pilot pressure is transmitted from the joystick to port (P1) and solenoid valve (10) and port (B1) to the port of bank valve (3) for telescoping cylinder (boom retract). Tilt Cylinder (Coupler Tilt Forward)Joystick (1) is moved to the right and the switch on the front of the handle is pressed. Solenoid valves (8), (9) and (10) are energized. Pilot pressure is transmitted from the joystick, through port (P2), solenoid valve (10), solenoid valve (8) and port (A2) to the port of bank valve (3) for tilt cylinder (coupler tilt forward). Tilt Cylinder (Coupler Tilt Backward)Joystick (1) is moved to the left and the switch on the front of the handle pressed. Solenoid valves (8), (9) and (10) are energized. Pilot pressure is transmitted from the joystick through port (P1), solenoid valve (9) and port (A1) to the port of bank valve (3) for tilt cylinder (coupler tilt backward). Service Brake Master CylinderPressure is transmitted directly from port (X2) on the manifold of control valve (4) to a boost pressure port on the service brake master cylinder.Note: The brake system is described in System Operation, Testing and Adjusting, RENR5106, "Brake System".Differential LockWhen solenoid valve (11) is de-energized the differential lock is disengaged. The line that operates the differential lock cylinder from port (Y) is connected to the hydraulic tank