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The oil pressure relief valve VG1500070097 / AZ1500070097 is a vital part of the lubrication system for Weichai engines (WD615, WD10 series). It maintains optimal oil pressure across all engine speeds, protecting internal components from friction and excessive wear. Our service expertise highlights that a reliable pressure valve is key to preventing catastrophic engine failure, especially in high-load construction and mining operations. Mechanic's Expert Advice: A common symptom of a faulty VG1500070097 valve is inconsistent oil pressure readings or a "low pressure" warning during engine idling. If the valve gets stuck due to carbon deposits or debris, it can lead to oil starvation in the cylinder head. During replacement, ensure that the valve seat is perfectly clean. We recommend using genuine Weichai parts to ensure the correct spring tension and bypass threshold, which is crucial for the hydraulic balance of the engine. We specialize in spare parts for major heavy machinery brands: CHANGLIN, Sinomach, XCMG, Everun, HOWO, SITRAK, FAW, SEM, SDLG, LiuGong, FOTON, LINGONG, SHANTUI, CHENGGONG, XGMA.