What causes the leans?

[davidbrady]

Folks,

A while back Hector Duplichen did a brilliant animation of the air suspension used in our buses including level-low. He made it public domain. I can't seem to find it but I'll continue looking. In the meantime the attached article may be helpful - skip the text and go right to Hector's pictures. All of the diagrams in the article are Hector's. You can see there're five norgren spool valves at the rear of the coach. Rather than chase leaks to specific valves, most folks simply replace all five when they get the leans.

Ernie, Joe Cannarozzi, is a traveling Prevost mechanic. I'm sure a quick call to him would point you in the right direction. His recommendation to me is: if the bus is leaning, replace everything on that side; i.e., all norgrens and all air bags, and if the bus isn't leaning, do nothing.

Hish informs me that Hector's webinar, "Prevost Air Systems and the Leans", is available on the Prevost Car website. The website does require registration but registration is open to Prevost motorcoach owners. I'll get the details and post later.