COMBUSTION & MTG GP-EXHAUST 3844297 - Caterpillar

Illustration 1 g01284643
Main Control Valve Group (Implement) (1) Inlet Manifold (2) Valve Assembly (Steering priority) (3) Proportional pilot reducing valves (4) Outlet Manifold (5) Relief Valve (Pressure reducing valve) (6) Solenoid Valve Group (shutoff for pilot oil) (7) Pump supply (8) Pilot oil passage (9) Proportional pilot reducing valves (10) Return oil line (11) Supply oil to brake circuitOil from the piston pump flows into pump supply passage (7) that is located in inlet manifold (1) . The oil flows to Valve Assembly (Steering priority) (2) that is also located in the inlet manifold.ReferenceSee Systems Operation/Testing and Adjusting, " Inlet Manifold " for more information.Part of the oil flows through the steering priority valve and part of the oil flows through the main body of the main control valve group. This oil flows into outlet manifold (4) . The oil then flows to Relief Valve (Pressure reducing valve) (5) that is located in the outlet manifold.ReferenceSee Systems Operation/Testing and Adjusting, " Outlet Manifold " for more information.The Relief Valve (Pressure reducing valve) reduces the high pressure of the pump supply to 3450 150 kPa (500 20 psi). The reduced pressure oil is used as pilot oil in the implement hydraulic system and as brake oil in the brake hydraulic system. Part of this oil flows through an internal passage into supply oil to brake circuit (11) . The rest of the reduced pressure oil flows through Solenoid Valve Group (shutoff for pilot oil) (6) into pilot oil passage (8) .The excess oil from pump supply (7) flows out of Relief Valve (Pressure reducing valve) (5) and into return oil line (10) .The main control valve is pilot operated. The Electronic Pilot Valve Group (implement) is directly mounted to the side of the Main Control Valve Group (implement). The pilot valve consists of two Control Manifold Group (Pilot ECM), and eight pressure reducing valves. Each pressure reducing valve has a proportional solenoid.Pilot oil passage (8) is a common passage in the Electronic Pilot Valve Group (implement). The oil in pilot oil passage (8) flows to proportional pilot reducing valves (3) and proportional pilot reducing valves (9) . If there is no demand for the use of the implements the proportional pilot reducing valves block the oil. When there is demand for the use of the implements, the proportional pilot reducing valves route the pilot oil to the main control valve spools in metered amounts in order to control the work tool.ReferenceSee Systems Operation/Testing and Adjusting, "Operation of the Implement Control Valve" for more information.