Has anyone had trouble with air bubbles entering hydraulic reservoir causing it to overflow through cap vent? Last year I bought this 2004 BC625A and have had no troubles until recently I was operating it and noticed it was overflowing through the cap. I changed the oil and filter and no luck. It does not appear to be sucking air anywhere in the line from the tank to the pump. I?m not having much luck getting information about this machine or finding parts, any help would be greatly appreciated.