DIY Tractor Log Splitter Hydraulic Pump Whine When Warm – Anyone Know What's Wrong?

Testing out the custom, homemade tractor-powered log splitter! However, there is an annoying whining noise coming from what seems to be the hydraulic pump once it gets warm. The oil level is checked and full, and we can't find any obvious faults. Does anyone know what might be causing this issue? Let us know in the comments below! Don't forget to like, subscribe, and hit the bell for more rural workshop projects and troubleshooting videos!