卡特彼勒高压共轨C6.4分析.ppt

Caterpillar: Confidential Red Transfer Pump Driven by High Pressure Pump Draws Fuel through Primary Filter Output Pressure 300 to 400 kPa 43 to 58 PSI Transfer Pump Primed by Priming Pump Hand or Electric No Lift Pump Required Fuel Pump Function Fuel Pressure Relief Valve Protects System from Over-Pressure Opens at Constant Pressure of 160 MPa (23,000 PSI) Withstands Spikes to 190 Mpa (27,500 PSI) Returns fuel to Tank Injector Function ECM Energizes Injector Valve Lifts Fuel Flows to Nozzle Fuel Injector Trim code Do Write down the Injector Serial Number and Confirmation Code before you install the Injector Do use Cat ET to Program ECM with proper Injector Trim File Do Look for the Trim File CD in the Injector Box Trim file can be found in sis web Fuel Injection Serviceability NEVER loosen high pressure pipes when engine is running! 23,000 PSI Use Electronic Service Tool to Troubleshoot Injector Problems Injectors have no serviceable parts. Pump Solenoid is non serviceable. If the solenoid is removed the whole pump assembly must be replaced. Transfer pump is a serviceable item, separate from High Pressure pump. Speed sensor is serviceable. GENEARAL SERVICE PROCEDURES … CONT Do not pre fill the filters. Install filter dry and use priming to fill with fuel Common rail fuel system is a self bleeding fuel system and does not require air to be purged from the system. Once a fitting has been loosened, the entire fuel pipe must be replaced with a new part to ensure proper seating and leak-free performance. Due to the unique “internally hardened” manufacturing process, high pressure pipes are single use Common rail fuel systems operate at extremely high pressures (20000 psi). Never loosen or open a high pressure fuel line while cranking or running a common rail fuel system. GENEARAL SERVICE PROCEDURES … CONT FUEL tank drain : Drain water and sediments from Fuel tank daily, Keep fuel tank breather filter clean. Ensure, once th