ROD 0861938 - Caterpillar

Proportional Reducing Solenoids for Variable Relief
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Tool relief valves (front view)
(1) Proportional reducing solenoid for variable relief
(2) Proportional reducing solenoid for variable relief
(3) Main control valve
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Proportional reducing solenoid for variable relief
The proportional solenoid valve for variable relief is controlled directly by the machine ECM. When the controller determines the requirements for relief pressure to the work tool, the controller sends varying signals to this solenoid. Two of these solenoids are used to control relief pressure to the work tool for both one-way flow and two-way flow. This solenoid is only present on machines that are equipped with System 13 and System 18.Solenoid Valve for One-Way Flow and Solenoid Valves for Variable Relief
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Solenoid for one-way flow and solenoids for variable relief
(1) Number one line relief valve
(2) Electronic check for stem 1 "(EC1)"
(3) "(EC3)" Solenoid for one-way flow
(4) Number two line relief valve
(5) Electronic check for stem 2 "(EC2)"
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(6) Electric check valves for the following "(EC1)" (2), "(EC3)" (3), and "(EC2)" (5)
(7) Electric line relief valve (1), and electric line relief valve (4) There is one solenoid valve for one-way flow. When "(EC3)" solenoid for one-way flow (3) is energized, hydraulic flow is allowed to travel in only one directions. This solenoid is only present on machines that are equipped with System 14 and System 17.Solenoid Valve (Proportional Reducing)
Illustration 5 g00777019The solenoid valve (proportional reducing) is controlled directly by the Machine ECM. When the Controller determines the requirements for hydraulic flow, the controller sends varying signals to this solenoid.Attachment Solenoid Valves
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Extend solenoids and retract solenoids
Machines that are equipped with the following joystick thumbwheel, joystick with four buttons, foot switch and electric foot pedal, use solenoid valves in order to control the flow of pilot oil. Pilot oil enters the valve manifold through the pressure port (P). When a solenoid receives current, the spool will shift. Pilot oil will flow out of discharge port (A(X)). After the current to the solenoid is discontinued, the valve shifts, and the pressure will drain to the tank through the drain port (T).