First of all, the hydraulic pump, AC compressor drive belts, and fan belts are vital for engine function. They're placed on the engine's right side and require inspections due to wear. To inspect, turn off the engine, open the hood, and locate the belts. Replace any damaged belts. Adjust the belts by loosening the relevant adjustment bolt. To replace a belt, remove it and compare it at a parts store. Ensure proper fit in the pulleys after replacement.