HOSE AS 3529150 - Caterpillar

Two-Way Flow From One Pump
Description
The default parameter values for two-way hydraulic oil flow from one main pump are shown in Table 1. A typical example is a pulverizer. Refer to Testing and Adjusting, "System 2: 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.When the "TOOL #3" for two-way flow from one pump is active, the following solenoids are energized:
Solenoid valve for one-way/two-way flow (3)
Negative flow control PRV (12)Solenoid valve for one-way/two-way flow (3) allows pilot oil to shift attachment valve (15) upwards for two-way flow.During operation of the work tool, the machine ECM sends a signal to the proportional solenoid valve for negative flow control (12). Negative flow control pressure in the center bypass passage is blocked when the attachment valve (15) shifts. The machine 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 for 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.Operation
Illustration 5 g03324478Pilot pump (23) supplies oil to pilot manifold (20). When the hydraulic activation lever is moved to the UNLOCK position, pilot oil flows from pilot manifold (20) to right hydraulic pedal (1) and the proportional solenoid valve for negative flow control (12).When right pedal (1) is pressed in the FORWARD position, pilot oil is directed to the top of auxiliary control valve (15). The pilot oil will shift the spool in the auxiliary control valve to the DOWNWARD position. This action allows oil from idler pump (22) to flow through auxiliary control valve (15). The pump