MODULE GP-CONTROL 3709478 - Caterpillar

Illustration 1 g01276984
(1) Return line for the work tool (2) Supply line for the work tool (3) Line relief valve (4) Main control valve (5) Attachment control valve (6) Proportional solenoid valve for negative flow control (7) Machine electronic control module (8) Main relief valve (9) Solenoid valve (10) Lines for negative flow control (11) Thumb switch for the attachment control valve (12) Attachment's F2 single acting relay (13) Pilot manifold (14) Drive pump (15) Pilot pump (16) Idler pump (17) Hydraulic tankThe default parameter values for "TOOL #'s" are for one-way hydraulic oil flow from two main pumps. Refer to Testing and Adjusting, "System 16: Default Value of Work Tool Parameters" for the Tool Control System.Use the display monitor or ET in order to set the hydraulic flow to the work tool. The work tool is operated by the inside switch on the right joystick.
Illustration 2 g01150343
(11) Inside switch on the right joystick for activation of the work toolPilot pump (15) supplies oil to pilot manifold (13) . When the hydraulic activation lever is moved to the UNLOCK position, pilot oil flows from pilot manifold (13) to the solenoid valve (9) . When the inside switch on the right joystick (11) is depressed, pilot oil flows to attachment control valve (5) . The pilot oil shifts the attachment control valve (5) to the UPWARD position. This allows oil from both the drive pump (14) and the idler pump (16) to flow through the attachment control valve (5) . The oil from the two pumps combines before the oil passes through the attachment control valve (5) . The pumps oil flows through the supply line for the work tool (2) to the work tool. The pump oil flows to relief valve (3) . The working pressure for the work tool is controlled by relief valve (3) . Return oil flows through the line for the work tool (1) and back to hydraulic tank (13) . During operation of the work tool, the machine ECM sends a signal to the proportional solenoid valve for negative flow control (6) . Negative flow control pressure in the center bypass passage is blocked when the attachment control valve (5) shifts UPWARD or DOWNWARD. Pilot oil is directed from the proportional solenoid valve for negative flow control (6) to the pump regulator through the lines for negative flow control (10) . The machine ECM has programmed parameter values "A1 FLOW", "A1 MULTI ADD FLOW", "A1 NOMINAL PRES", and "COMBINER ENABLE" for the oil flow to the work tool. The ECM regulates the pressure to the work tool by adjusting the line relief valve (3) . The machine ECM regulates the negative flow control pressure that will be supplied to the pump regulator. The negative flow control pressure positions the swashplate in the pump to the correct angle in order to provide the desired oil flow to the work tool.