VALVE GP-RELIEF 2758509 - Caterpillar

Asphalt Paver: AP600D (S/N: TFM1-UP; TFZ1-UP) AP655D (S/N: GNN1-UP; MAN1-UP; MAT1-UP; GNZ1-UP) BG600D (S/N: B6K1-UP) BG655D (S/N: BPA1-UP) BG655D MTS (S/N: B5D1-UP)Backhoe Loader: 420E (S/N: PRA1-UP; PHC1-UP) 430E (S/N: SCD1-UP; RLN1-UP) 450E (S/N: EBL1-UP)Soil Compactor: CB64 (S/N: DJM1-UP) CP56 (S/N: C5P1-UP; FCP1-UP) CP64 (S/N: P7F1-UP; C6P1-UP) CS74 (S/N: C8F1-UP; C8S1-UP) CS76 (S/N: JCS1-UP; CYX1-UP)Generator Set: C4.4 (S/N: GLD1-UP; GLE1-UP)Engine: C4.4 (S/N: D4B1-UP; L1K1-UP; S1M1-UP; 4441-UP; D1K1-UP; D4D1-UP) C6.6 (S/N: SDA1-UP; N6D1-UP; 6661-UP)Excavator: M313D (S/N: W3H1-UP) M315D (S/N: W5M1-UP) M316D (S/N: W6A1-UP) M318D (S/N: W8P1-UP) M322D (S/N: W2S1-UP) M318D MH (S/N: W8R1-UP) M322D MH (S/N: W2T1-UP)Integrated Toolcarrier: IT38H (S/N: JNJ1-UP)Load Haul Dump: R1300G Series II (S/N: RSL1-UP)Motor Grader: 120M (S/N: B9C1-UP; B9N1-UP; CBS1-UP; B9W1-UP; D9W1-UP) 12M (S/N: B9F1-UP; B9R1-UP)Paving Compactor: CP54 (S/N: C5Y1-UP) CP74 (S/N: P8F1-UP; C8P1-UP) CP76 (S/N: C7L1-UP; JCP1-UP) CS-533F (S/N: C5X1-UP) CS54 (S/N: C5R1-UP; C5W1-UP) CS56 (S/N: C5S1-UP; FCS1-UP) CS64 (S/N: C7F1-UP; C6S1-UP)Pipelayer: PL61 (S/N: WGS1-UP)Track-Type Loader: 953D (S/N: LBP1-UP) 963D (S/N: LCS1-UP)Track-Type Tractor: D3K (S/N: JTD1-UP; FFF1-UP; LLL1-UP) D4K (S/N: MMM1-UP) D5K (S/N: JLF1-UP; YYY1-UP) D6K (S/N: DHA1-UP; NCF1-UP; FBH1-UP) D6N (S/N: DJA1-UP; DJY1-UP) D4K LGP (S/N: RRR1-UP) D5K XL (S/N: WWW1-UP) D6N XL (S/N: JAH1-UP)Wheel Loader: 910H (S/N: KAT1-UP) 924H (S/N: HXC1-UP; JTM1-UP; KLN1-UP) 924HZ (S/N: WLB1-UP; PED1-UP; BEF1-UP) 928H (S/N: RSB1-UP) 928HZ (S/N: BYD1-UP; CXK1-UP) 930H (S/N: DHC1-UP; FTD1-UP) 938H (S/N: MCC1-UP; MJC1-UP; JKM1-UP; LKM1-UP)Wheel Tractor-Scraper: 613G (S/N: ESB1-UP)Introduction
This document provides information about fuel degradation, which can cause a flow restriction of fuel through the fuel system and premature plugging of the filters. These guidelines should be used to guide service personnel in the use of fuels within diesel engines and covers recognized tests in identifying degredated fuels and best practices in storing fuels.This document can be used as a guide, but it does not provide all the information on all practices and procedures for degraded fuels. This document does not provide all the information for best practices for storing and handling fuels. Refer to Caterpillar Commercial Diesel Engine Fluids Recommendations, SEBU6251 for more information.The Thermal Stability and Oxidation Stability of Fuel
Diesel fuels can deteriorate rapidly for a variety of reasons. When the fuel is stressed and stored for long intervals, degradation and oxidation can occur. Degradation and oxidation are complex chemical changes. These changes lead to deposits or sediment from certain hydrocarbons and traces of naturally occurring nitrogen and sulfur containing compounds in the fuel. Fuel composition and environmental factors influences the process.Diesel fuel is being used as a coolant for high pressure fuel injection systems with high temperature fuel wetted walls. This can stress the fuel in the fuel system. The thermal stress and an increase in recirculation fuel temperature is often responsible for fuel degradation and the formation of gums, resins and sediment, which can cause fuel flow restriction through fuel filters and fuel injection systems.Certain products are often left with the fuel in the fuel system for long periods. This exposes the fuel to oxygen. Complex reactions between the oxygen and the fuel components can generate fuel particulates. The