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| Illustration 1 | g01277774 |
(1) Return line for work tool (2) Supply line for work tool (3) Line relief valve (4) Main control valve (5) Attachment control valve (6) Proportional reducing solenoid valve (7) Lines for negative flow control (8) Right foot pedal (9) Implement/swing pressure switch (10) Pilot manifold (11) Drive pump (12) Pilot pump (13) Hydraulic tank | |
The default parameter values for "System 1" are for one-way hydraulic oil flow from one main pump. Refer to Testing and Adjusting, "System 1: Default Value of Work Tool Parameters" for the Tool Control System.
The flow to the work tool can be set by using the monitor or ET.
The work tool is operated by right foot pedal (8) that is located in the cab.
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| Illustration 2 | g00606536 |
Right Foot pedal for the work tool | |
Pilot pump (12) supplies oil to pilot manifold (10) . When the hydraulic activation lever is moved to the UNLOCK position, pilot oil flows from pilot manifold (10) to right foot pedal (8) . When right foot pedal (8) is depressed FORWARD, pilot oil flows to attachment control valve (5) . The pilot oil will shift the spool in the attachment control valve to the UPWARD position. This allows oil from drive pump (11) to flow through the valve. The pump oil flows through the 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 the operation of the work tool, implement/swing pressure switch (9) senses pilot pressure.
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 control valve spools shift UPWARD. The machine's ECM has the following programmed parameter values: "A1 FLOW", "A1 MULTI ADD FLOW", "A1 NOMINAL PRES" and "COMBINER ENABLE". The parameters control the flow and pressure of the work tool. The machine ECM regulates the negative flow control pressure that will be supplied to the pump regulator. The negative flow control pressure forces the swashplate in the pump to the correct angle to limit the flow and pressure to the work tool.
The pressure setting for the relief valve must be reset to the specification of the supplier for the work tool that is being used.