Research on the high-temperature failure characteristics of hydraulic pump shaft sealing parts helps engineers better understand why leakage, deformation, and wear occur in real industrial conditions. Shaft seals in hydraulic pumps are continuously affected by rotating motion, frictional heat, oil temperature, pressure variation, and contamination. Under high-temperature operation, elastomer materials may undergo hardening, embrittlement, softening, or permanent deformation depending on the compound type and service conditions. These changes reduce lip flexibility and disturb the balance between contact force and lubrication film formation. Once the lip can no longer adapt to shaft movement, leakage and accelerated wear become more likely. High temperature also increases oxidation speed and may worsen compatibility issues with certain oils or additives. Failure analysis usually focuses on lip wear patterns, material cracking, dimensional distortion, spring performance, and leakage traces around the shaft interface. The goal is to improve seal design, material choice, and maintenance strategy. Industrial seals engineered for hydraulic pump applications support better thermal stability, reliable sealing force, and longer service life. They are widely used in industrial machinery, heavy equipment, hydraulic power packs, and engineering systems that demand dependable sealing under severe temperature and load conditions.