05-13-2015, 05:28 AM
I know this is an old post but our 510 came from newell with the blue height control valves...they looked like they were recently replaced. It uses air really fast when traveling. I watch the air gauge (the one with only one indicator needle) cycle about every 2 minutes just like Richard said.
Jonathan Shetler
1999 Newell 510
Ft Lauderdale, FL