KIT-PUMP 2710908 - Caterpillar

Illustration 1 g03664284
Two-Way / One Pump - Electronic Control
(1) Line
(2) Line
(3) Main control valve
(4) Flow limit 1 pressure sensor
(5) Proportional reducing valve (Flow limit 1)
(6) Proportional reducing valve (Flow limit 2)
(7) Flow limit 2 pressure sensor
(8) Proportional reducing valve (A2 retract)
(9) Proportional reducing valve (A1 retract)
(10) Proportional reducing valve (A2 extend)
(11) Proportional reducing valve (A1 extend)
(12) F2.2 stack valve
(13) Tool line relief valve
(14) Attachment control valve
(15) Attachment control valve
(16) Tool line relief valve
(17) Hydraulic oil cooler
(18) Pilot manifold
(19) Main relief valve
(20) Hydraulic tank
(21) Pilot relief valve
(22) Idler pump
(23) Drive pump
(24) Pilot pump
(25) Proportional reducing valve (power shift pressure) 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
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.
Table 1
Operation Lever List
Control Extension Retraction
Right Joystick Thumbwheel Push Forward Push Backward
Electric Foot Pedal Push Forward Push Backward The following description is made under the assumption that the idler pump is supplying oil to the work tool.
Illustration 2 g03664362
Two-Way Flow from One Pump (idler pump)
(10) Proportional reducing valve (A2 extend)
(12) F2.2 stack valve
(14) Attachment control valve
(15) Attachment control valve
(20) Hydraulic tank
(22) Idler pump
(23) Drive pump
(24) Pilot pump When the device for activation listed in Table 1 is pushed forward, the machine ECM sends a modulated signal to proportional reducing valve (10). Proportional reducing valve (10) allows pilot oil to flow to the attachment control valve (15). Attachment control valve (15) shifts, allowing high pressure from the idler pump to flow to the work tool.Oil returning from the work tool flows back through attachment control valve (15) and back to the hydraulic tank.During the operation of the work tool, the oil flow for the idler pump (22) is controlled by the NFC signal created by spool shift only. Since the attachment control valve (14) does not shift, the drive pump is controlled by the negative flow control