MY power steering box is loosing fluid after every 20 minutes of cutting. I fill the box back up and it runs and turn perfectly. But after 20 minutes of cutting it become hard to turn, and I have to turn the steering wheel around and around to get the front wheels just to turn a little. Is it leaking as I drive and turning the tractor, because I do not see any heavy leak drops when the tractor sits still, or parked not running. I see some fluid drops on the engine below the power steering box. Could there be a leak below the fluid box? where and what do I look for. Does this tractor have a power steering pump? Is it located below: the power steering box?