I just purchased the same saw on Sat. 20.00, with no bottom guide, and one tilt radius missing. You got the Deal. The Top wheel is oil filled through a pressure bearing. I would say try to fill with a good grease, and the bottom bearing has an oil drip that you might get a zirk fitting in. I replaced with urethane tires from sulfur grove, they custom size diameter and witdth before shipping.Great Saw