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| Illustration 1 | g03424186 |
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Two-Way / One Pump - Electronic Control (1) Tool line relief valves (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (10) Boom 1 control valve (11) Stick 2 control valve (16) Main relief valve (17) Proportional reducing valve (Flow limit 2) (18) Proportional reducing valve (Flow limit 1) (19) Flow limit 1 pressure sensor (20) Flow limit 2 pressure sensor (21) Pilot pump (22) Drive pump (23) Idler pump (24) Main control valve (25) Proportional reducing valve (power shift pressure) (34) Proportional reducing valve (A1 retract) (35) Proportional reducing valve (A1 extend) (36) Pilot manifold (37) Pilot relief valve (38) Hydraulic tank | |
Two-Way / One Pump with electronic control is designed to allow complete electronic control over the work tool. This hydraulic system allows the operator to control a work tool with a two-way flow system with from one pump.
Two-way flow from one pump can be achieved by selecting a work tool that requires two-way flow from one pump. The work tool can be selected through the monitor or by the work tool select switch. A typical example is a grapple that receives oil from one pump only.
When one pump flow is required to the work tool, the pump supplying the oil can be programmed through the monitor. The following situations are listed to increase controllability of the work tool.
- When the work tool with a boom and bucket operation is used most often, the idler pump is recommended as the supply pump.
- When the work tool with a stick and swing operation is used most often, the drive pump is recommended as the supply pump.
Reference: Refer to Testing and Adjusting, "Work Tool Parameter - Program" for the tool control system to change the settings for work tool operation.
Reference: Refer to Testing and Adjusting, "Two-Way / One Pump - Electric Control: Default Value of Work Tool Parameters" for the Tool Control System to reference the factory settings.
| Operation Lever List | ||
| Control | Extension | Retraction |
| Right Joystick Thumbwheel | Push Forward | Push Backward |
| Electric Foot Pedal | Push Forward | Push Backward |
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| Illustration 2 | g03424829 |
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Two-Way Flow from One Pump (drive pump) (1) Tool line relief valves (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (10) Boom 1 control valve (11) Stick 2 control valve (16) Main relief valve (17) Proportional reducing valve (Flow limit 2) (18) Proportional reducing valve (Flow limit 1) (19) Flow limit 1 pressure sensor (20) Flow limit 2 pressure sensor (21) Pilot pump (22) Drive pump (23) Idler pump (24) Main control valve (25) Proportional reducing valve (power shift pressure) (34) Proportional reducing valve (A1 retract) (35) Proportional reducing valve (A1 extend) (36) Pilot manifold (37) Pilot relief valve (38) Hydraulic tank | |
When the device for activation listed in Table 1 is pushed forward, the machine ECM sends a modulated signal to proportional reducing valve (35). Proportional reducing valve (35) allows pilot oil to flow to the attachment control valve (6). Attachment control valve (6) shifts, allowing high pressure from the drive pump to flow to the work tool.
Oil returning from the work tool flows back through attachment control valve (6) and back to the hydraulic tank (38).
During the operation of the work tool, the oil flow for the drive pump (22) is controlled by the NFC signal created by spool shift.
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| Illustration 3 | g03424862 |
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Two-Way Flow from One Pump (drive pump) (1) Tool line relief valves (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (10) Boom 1 control valve (11) Stick 2 control valve (16) Main relief valve (17) Proportional reducing valve (Flow limit 2) (18) Proportional reducing valve (Flow limit 1) (19) Flow limit 1 pressure sensor (20) Flow limit 2 pressure sensor (21) Pilot pump (22) Drive pump (23) Idler pump (24) Main control valve (25) Proportional reducing valve (power shift pressure) (34) Proportional reducing valve (A1 retract) (35) Proportional reducing valve (A1 extend) (36) Pilot manifold (37) Pilot relief valve (38) Hydraulic tank | |
When the device for activation listed in Table 1 is pushed backward, the machine ECM sends a modulated signal to proportional reducing valve (34). Proportional reducing valve (34) allows pilot oil to flow to the attachment control valve (6). Attachment control valve (6) shifts, allowing high pressure from the drive pump to flow to the work tool.
Oil returning from the work tool flows back through attachment control valve (6) and back to the hydraulic tank.
During the operation of the work tool, the oil flow for the drive pump (38) is controlled by the NFC signal created by spool shift only.