When turn the steering wheel to the right I get a hum from front

I did check the power steering fluid, it was completely full. Are there any other indications to look for to determine if the rack and pinion is the issue? I did check the power steering fluid, it was completely full. Are there any other indications to look for to determine if the rack and pinion is the issue?

Rack and pinion steering systems fail a number of ways, when internal clearances become too large from normal wear and use, leaks can develop, causing a loss of fluid. They can become "loose" and exhibit a condition known as wander, they can become difficult to turn or cause scraping dragging noises, usually the pump should be replaced as well, due to metal contamination when an internal problem has developed. Rack and pinion steering systems fail a number of ways, when internal clearances become too large from normal wear and use, leaks can develop, causing a loss of fluid. They can become "loose" and exhibit a condition known as wander, they can become difficult to turn or cause scraping dragging noises, usually the pump should be replaced as well, due to metal contamination when an internal problem has developed.