VALVE & MTG GP-VIBRATORY 1686993 - Caterpillar

High-Pressure Fuel System
Illustration 9 g06225153
(1) Injector
(2) Accumulator quill tubes
(3) HP injection lines
(4) Line support clamps
(5) HP fuel pump
(6) Pump to accumulator HP lines
(7) HP junction blockThe common rail high pressure (HP) fuel transfer system on this engine consists of high-pressure fuel accumulator quill tubes. The accumulator quill tubes maintain a volume of fuel that is used to supply each cylinder as needed. High-pressure fuel lines transport fuel between the high-pressure fuel pump, high-pressure accumulator quill tubes which supply the common-rail injectors.The main components of this system Illustration 9 are the:
High-pressure fuel pump to junction block lines
High-pressure junction block
Accumulator quill tubes
Accumulator quill tube to accumulator quill tubes fuel injection lines
Accumulator quill tubes that connect to the fuel injectorsThe low-pressure fuel system provides fuel at the proper pressure, temperature, and cleanliness level to the high-pressure fuel pump. The high-pressure fuel pump pressurizes the fuel to the level required for the engine operating condition. System pressure in the high-pressure fuel system is controlled electronically via a fuel control valve. This regulates the amount of fuel that is allowed to enter the inlet of the pump. A pressure relief valve mounted on the high-pressure pump manifold mechanically limits the maximum fuel pressure in the system in the event of a malfunction.High-pressure fuel flows from a manifold on the high-pressure pump to a high-pressure junction block. The junction block distributes fuel to each engine cylinder bank via double-walled high-pressures lines. The double-wall serves to prevent the escape of any high-pressure fuel in the event of fuel leakage from the high-pressure system. This ensures safe containment of the fuel in the event of a high-pressure leak. The fuel is then transported to the injectors along each cylinder bank via the double-walled high-pressure lines. If leakage into the double-wall system occurs, perform the necessary repairs as quickly as possible.Fuel is transported to the accumulator quill tubes through the double-walled high-pressure fuel lines. The accumulator quill tubes contain an integral metallic filter to prevent large debris from getting to the injectors. The integral flow limiting device shuts off flow to the cylinder and prevents over fueling in the event a higher than expected flow to the injector.The accumulator quill tubes transport high-pressure fuel through each cylinder head directly to electronically controlled injectors that provide the proper injected fuel quantity and timing for the particular operating conditions.High-Pressure Fuel Pump
Illustration 10 g06225047
(1) High-pressure fuel pump
Illustration 11 g06225071
(2) High-pressure manifold
(3) High-pressure rail sensor
(4) Magnetic inspection plug
Illustration 12 g06225082
(5) Low-pressure monoblock
(6) Temperature sensor port
(7) Fuel control valve
(8) Fuel return port
(9) Fuel supply portThe common rail fuel system high-pressure fuel pump on this engine is driven by an idler driven off the engine gear train.The high-pressure pump receives fuel from the fuel transfer pump and pressurizes the fuel up to desired injection pressure. The pump provides pressurized fuel to the fuel injectors through the high-pressure fuel lines and accumulator quill tubes.The high-pressure manifold (1) mounted to the top of the pump integrates the rail pressure sensor port, temperature sensor port, pressure relief valve, and the