Maintenance requirements for hydraulic pumps in building hoists include regular inspection of the pump for leaks, wear, and proper lubrication. It's crucial to check the hydraulic oil level and quality, ensuring it's clean and at the correct level. The oil should be changed periodically as per the manufacturer's recommendations. Inspect the pump for any unusual noises or vibrations which could indicate wear or damage. Regularly clean the filter to prevent blockages and ensure efficient operation. Additionally, check the pump's pressure and flow rate to confirm it's operating within the specified parameters. Following the manufacturer's maintenance schedule and guidelines is essential to prolong the life of the hydraulic pump and ensure the safety and efficiency of the building hoist.