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| Illustration 1 | g03418881 |
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Combined Function - Electronic Control (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (10) Boom 1 control valve (11) Stick 2 control valve (12) Boom cylinders (13) Stick cylinder (14) Left joystick (stick) (15) Right joystick (boom) (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) (26) Proportional reducing valve (Stick IN) (27) Proportional reducing valve (Boom DOWN) (28) Boom DOWN control pressure sensor (29) Boom UP control pressure sensor (30) Stick OUT control pressure sensor (31) Stick IN control pressure sensor (32) Proportional reducing valve (A2 retract) (33) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) (36) Pilot manifold (37) Pilot relief valve (38) Hydraulic tank | |
Combined function with electronic control is designed to allow complete electronic control over the work tool. A combined function hydraulic system combines the features of the one-way/two-way flow system with the features of the one pump/two pump flow system.
One-way flow from one pump can be achieved by selecting a work tool that requires one-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 hammer that receives oil from one pump only. When this work tool is selected, variable relief solenoid valve (9) is open for one-way mode. This operation allows oil to flow directly to the oil cooler instead of through the main control valve. This action will allow for a higher flow of oil with the reduction of resistance by bypassing the main control valve.
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, "Combined Function - Electric Control: Default Value of Work Tool Parameters" for the Tool Control System to reference the factory settings.
| Operation Lever List | |
| Control | Extension |
| Right Joystick Thumb Wheel | Push Forward |
| Electric Foot Pedal | Push Forward |
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| Illustration 2 | g03422640 |
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One-Way Flow from One Pump (drive pump) (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
The following description is made under the assumption that the drive pump is supplying oil to the work tool.
When the device for activation listed in Table 1 is pressed, the machine ECM sends a modulated signal to proportional reducing valve (35). Proportional reducing valve (35) allows pilot oil to flow to attachment control valve (6). Attachment control valve (6) shifts, allowing high-pressure oil from the drive pump to flow to the work tool.
When abnormally high pressure occurs in the line to the work tool, variable relief solenoid valve (7) opens at the parameter set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) is adjustable through the monitor.
Oil returning from the work tool flows into the return system through variable relief solenoid valve (9) and back to the hydraulic tank.
During the operation of the work tool, the oil flow for the drive pump is controlled with flow limit valve (18) by the machine ECM. Since attachment control valve (2) does not shift, the idler pump is controlled by the negative flow control pressure.
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 thumb that receives oil from one pump only. When this work tool is selected, variable relief solenoid valve (9) is set to two-way flow mode and is set at the parameter setting for pressure.
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, "Combined Function - 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 Thumb Wheel | Push Forward | Push Backward |
| Electric Foot Pedal | Push Forward | Push Backward |
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| Illustration 3 | g03422768 |
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Two-Way Flow from One Pump (drive pump) (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
The following description is made under the assumption that the drive pump is supplying oil to the work tool.
When the device for activation listed in Table 2 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.
When abnormally high pressure occurs in the line to the work tool, variable relief solenoid valve (7) opens at the parameter set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) is adjustable through the monitor.
Oil returning from the work tool flows into the return system through attachment control valve (6) and back to the hydraulic tank.
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| Illustration 4 | g03422774 |
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Two-Way Flow from One Pump (drive pump) (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
When the device for activation listed in Table 2 is pushed backward, the machine ECM sends a modulated signal to proportional reducing valve (33). Proportional reducing valve (33) 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.
When abnormally high pressure occurs in the line to the work tool, variable relief valve solenoid (7) opens at the parameter set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) are adjustable through the monitor.
Oil returning from the work tool flows into the return system 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 is controlled with flow limit valve (18) by the machine ECM. Since the attachment control valve (2) does not shift, the idler pump is controlled by the negative flow control pressure.
One-way flow from two pumps can be achieved by selecting a work tool that requires one-way flow from two pumps. The work tool can be selected through the monitor or by the work tool select switch. A typical example is a hammer that receives oil from two pumps. When this work tool is selected, variable relief solenoid valve (9) is open for one-way mode. This operation allows oil to flow directly to the oil cooler instead of through the main control valve. This action will allow for a higher flow of oil with the reduction of resistance by bypassing the main control valve.
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, "Combined Function - Electric Control: Default Value of Work Tool Parameters" for the Tool Control System to reference the factory settings.
| Operation Lever List | |
| Control | Extension |
| Right Joystick Thumb Wheel | Push Forward |
| Electric Foot Pedal | Push Forward |
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| Illustration 5 | g03422814 |
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One-Way Flow from Two Pumps (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
When the device for activation listed in Table 3 is pressed, the machine ECM sends a modulated signal to proportional reducing valve (34) and proportional reducing valve (35). Proportional reducing valve (34) allows pilot oil to flow to attachment control valve (2). Proportional reducing valve (35) allows pilot oil to flow to attachment control valve (6). The pilot oil shifts attachment control valve (2) and attachment control valve (6 ), allowing high-pressure oil from the drive pump and the idler pump to combine and flow to the work tool.
When abnormally high pressure occurs in the line to work tool, variable relief solenoid valve (7) opens the parameter set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) are adjustable through the monitor.
Oil returning from the work tool flows into the return system through variable relief solenoid valve (9) and back to the hydraulic tank.
During the operation of the work tool, the oil flow for the drive pump is controlled by flow limit valve (18) and the machine ECM. The oil flow for the idler pump is controlled by flow limit valve (17) and the machine ECM.
Two-way flow from two pumps can be achieved by selecting a work tool that requires two-way flow from two pumps. The work tool can be selected through the monitor or by the work tool select switch. A typical example is a shear that receives oil from two pumps. When this work tool is selected, variable relief solenoid valve (9) is changed to a previously set pressure to turn into two-way flow mode.
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, "Combined Function - 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 Thumb Wheel | Push Forward | Push Backward |
| Electric Foot Pedal | Push Forward | Push Backward |
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| Illustration 6 | g03423128 |
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Two-Way Flow from Two Pumps (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
When the device for activation listed in Table 4 is pushed forward, proportional reducing valve (34) and proportional reducing valve (35) receives a modulated signal from the machine ECM. Proportional reducing valve (34) allows pilot oil to flow to attachment control valve (2). Proportional reducing valve (35) allows pilot oil to flow to attachment control valve (6). The pilot oil shifts attachment control valve (2) and attachment control valve (6), allowing high-pressure oil from drive pump (22) and idler pump (23) to combine and flow to the work tool.
When abnormally high pressure occurs in the line to work tool, variable relief solenoid valve (7) opens at a set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) is adjustable through the monitor. Oil returning from the work tool flows back through attachment control valve (2) and attachment control valve (6) and back to the hydraulic tank.
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| Illustration 7 | g03423143 |
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Two-Way Flow from Two Pumps (1) Tool line relief valves (2) Attachment control valve (idler pump) (3) Hydraulic oil cooler (4) Boom 2 control valve (5) Stick 1 control valve (6) Attachment control valve (drive pump) (7) Variable relief solenoid valve (8) Tool pressure sensor (9) Variable relief solenoid valve (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 (32) Proportional reducing valve (A2 retract) (32) Proportional reducing valve (A1 retract) (34) Proportional reducing valve (A2 extend) (35) Proportional reducing valve (A1 extend) | |
When the device for activation shown in Table 4 is pushed backward, proportional reducing valve (32) and proportional reducing valve (33) receives a modulated signal from the machine ECM. Proportional reducing valve (32) allows pilot oil to flow to the attachment control valve (2). Proportional reducing valve (33) allows pilot oil to flow to the attachment control valve (6). The pilot oil shifts attachment control valve (2) and attachment control valve (6), allowing high-pressure oil from drive pump (22) and idler pump (23) to flow to the work tool.
When abnormally high pressure occurs in the line to the work tool, variable relief solenoid valve (7) opens at a set pressure. This opening will allow the high-pressure oil into the return system and back to the hydraulic tank. The pressure setting of variable relief solenoid valve (7) is adjustable through the monitor. Oil returning from the work tool flows back through attachment control valve (2) and attachment control valve (6) and back to the hydraulic tank.
During the operation of the work tool, the oil flow for both pumps is controlled by flow limit valve (17), flow limit valve (18), and the machine ECM.