BEARING 2V0706 - Caterpillar

Introduction
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Fuel system diagram (1) Solenoid for the fuel pump (2) High pressure supply line (3) Fuel injector (4) Fuel pressure sensor (5) Fuel rail (6) Pressure relief valve for the fuel rail (7) Head of the ARD (8) Quill tube (9) ARD pilot fuel line (10) Pressure regulator for the drain line (11) ARD main fuel line (12) Fuel return line back to tank (13) Fuel tank (14) Primary fuel filter (15) Engine control module (ECM) (16) Secondary fuel filter (17) Transfer pump (18) Fuel pump (19) Speed/timing sensor (20) Pressure relief valve for the fuel pumpThe operation of this fuel system is completely different from any other type of fuel system that is actuated mechanically. The fuel system is completely free of adjustment. Adjustments to the components that are mechanical can not be made. Changes in performance are made by installing different software on the Engine Control Module (ECM) (15) .This fuel system consists of five major components:
Fuel pump (18)
Engine Control Module (ECM) (15)
Fuel Injectors (3)
Fuel rail (5)
Fuel transfer pump (17) Note: The components of the fuel system are not serviceable. These fuel system components must not be disassembled. Disassembly will damage the components. If the components have been disassembled, Caterpillar may not allow a warranty claim or Caterpillar may reduce the warranty claim.Fuel System Operation
Fuel is pulled from the fuel tank (13) and through the primary fuel filter (14) by the use of the transfer pump (17) . The transfer pump (17) sends the fuel through the secondary fuel filter (16) and up to the fuel pump (18) . The fuel pump (18) pressurizes the fuel that is sent to the fuel rail (5) . The fuel rail (5) distributes the fuel to the fuel injectors (3) by the use of quill tubes (8) . The fuel rail uses a fuel pressure sensor (4) that tells the ECM (15) the pressure of the fuel rail. The ECM also receives engine speed from the speed/timing sensor (19) . The ECM controls the solenoids for the fuel pump (1) in order to obtain the correct amount of pressure. If pressure at the fuel rail is too high, the pressure relief valve (6) will drain proper amounts of fuel back to the fuel tank. Once the fuel reaches the fuel injectors, the fuel injectors open a control valve that is inside of the injector by the use of a solenoid. The fuel injectors deliver the high pressure fuel into the combustion chamber at precise amounts of quantity and time. A drain in the fuel injector sends fuel that was not used during the delivery to the secondary filter. The pressure regulator (11) keeps a constant back pressure on the fuel injector. Component Description
Fuel Injector
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Side view (1) Solenoid (2) Control valve (3) Drain hole (4) Quill tube bore (5) TipThe fuel system utilizes electronic controlled fuel injectors. This system uses electronically actuated solenoids (1) to control the injection of the fuel into the combustion chamber.The injector uses a