CONTROL GP-FOOT BRAKE 6Y3516 - Caterpillar

The control manifold (1) maintains the selected angle of the work tool as the lift arms are raised. The control manifold only functions during the RAISE function. During the LOWER function, the control manifold does not affect the operation of the machine.
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(2) Solenoid valve (A) Oil from the rod end of the lift cylinders (B) Oil for the lift control valve (C) Oil for the rod end of the tilt cylinders (D) Oil for the head end of the tilt cylinders
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(3) Automatic leveling switch The solenoid valve (2) enables the control manifold. The solenoid valve is controlled by the switch (3). The switch (3) is located in the second position from the left side of the instrument panel. The instrument panel is located to the left and above the ignition switch. When you start the engine, solenoid (2) is energized. The control manifold is not activated. Oil flows through port (A) to solenoid (2). The oil flows through the top section of solenoid (2) and through port (B). Then, the oil flows to the lift spool.Press the bottom of the switch in order to activate the self-leveling function of the control manifold. When you press the bottom of the switch, solenoid (2) is de-energized. Oil flows through port (A) to the divider spool and to the unloading spool. Press the top of the switch in order to deactivate the self-leveling function of control manifold. Solenoid (2) is energized.Self-Leveling Operation (Raising the Work Tool)
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(4) Flow divider valve (5) Unloading spool (A) Oil from the rod end of the lift cylinders (B) Oil for the lift control valve (C) Oil for the rod end of the tilt cylinders (D) Oil for the head end of the tilt cylindersThe control manifold is activated. Solenoid (2) is de-energized. When the tilt control valve is in the HOLD position and the lift control valve is in the RAISE position, oil from the lift control valve enters the head end of the lift cylinders. As the lift cylinders extend, oil from the rod end of the lift cylinder enters port (A) .The oil enters the flow divider valve (4). The hydraulic oil divides into two loops. One loop flows through the fixed orifice. The second loop flows through the adjustable orifice. The flow divider valve (4) balances the pressure between the head end of the tilt cylinder and the rod end of the lift cylinder. When the pressure between the head end of the tilt cylinder and rod end of the lift cylinder are kept in balance, the load will stay level. The oil that flows through the fixed orifice flows out of port (B) and back to the tank. The variable orifice adjusts to the flow of oil from the rod end of the lift cylinders. The oil flows through the divider spool. Then, the oil flows to the unloading spool. The ports for the unloading spool are blocked. The oil will flow through the check valve and out port