ELBOW 3493309 - Caterpillar

Two-Way Flow from Two Pumps
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 (22) 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 Relief: Default Value of Work Tool Parameters" for the Tool Control System to reference the factory settings.
Illustration 7 g06252689
Two-Way Flow from Two Pumps
(1) Hydraulic oil cooler
(2) Proportional reducing valve (A2 extend)
(3) Pilot pressure reducing valve
(4) Main control valve
(5) Main relief valve
(6) Proportional reducing valve (A1 extend)
(7) Line relief valve (A2 extend)
(8) Line relief valve (A2 retract)
(9) Line relief valve (A1 extend)
(10) Line relief valve (A1 retract)
(11) F2 stack valve
(12) Proportional reducing valve (A2 retract)
(13) Attachment control valve (pump 2)
(14) Hydraulic lock solenoid
(15) Pump 2 output pressure sensor
(16) Pump 1 output pressure sensor
(17) Attachment control valve (pump 1)
(18) Proportional reducing valve (A1 retract)
(19) f2 stack valve
(20) Attachment pressure sensor (left)
(21)