Field analysis of on-site oil seal aging problems in high-temperature operating hydraulic pumps shows that seal failure is often the result of combined thermal, mechanical, and maintenance-related factors. In practical applications, hydraulic pumps may run continuously under heavy load, generating frictional heat at the shaft seal while also being exposed to hot oil, dust, pressure fluctuation, and vibration. These conditions accelerate aging of the elastomer and reduce the ability of the sealing lip to maintain stable contact with the shaft. Common on-site problems include hardening, lip wear, cracking, shrinkage, leakage, and even housing contamination caused by seal breakdown. Maintenance teams also find that poor shaft surface finish, improper installation, and insufficient lubrication greatly increase failure risk. Field observations confirm that using the wrong material for the operating temperature shortens seal life significantly. To solve these problems, users need industrial seals that offer heat resistance, structural stability, and compatibility with hydraulic media. Together with better cooling, installation practice, and routine inspection, suitable industrial seals help improve hydraulic pump reliability, reduce oil leakage, and extend maintenance intervals in construction machinery, manufacturing equipment, mining systems, and other demanding industrial applications with high-temperature operating conditions.