Has anyone had any trouble with dust getting around the dipstick on the hydraulic system and the rotor drive. The dipstick on our 8010 has a breather built in and it sucks dust into the dipstick tube. Noticed it really bad on the rotor drive dipstick. This seems like a poor design. I have had to wrap a rag around the top of the dipstick to filter the air that is being sucked in. You would think that it would always have positive pressure.