-
Searching for air leaks
Question pertaining to air leaks.
I downloaded the pneumatic diagram for my particular coach on the Prevost web site. There are five circuits identified by colored tubing: secondary, primary, parking brake, suspension and accessories. Unfortunately, the pneumatic diagram is in black and white so I cannot identify the different circuits on the diagram. Does anyone have a color version of document #D140260, rev B?
-
2 Replies
-
click articles above. go way down to prevost air/suspension system. That should help.
-
Michael,
Since you are downloading the diagrams you likely have the listing on the diagram that denotes what each color is for. As nice as it is to have that information I can tell you when you get down to working on the actual system you will find your coach may lack consistency with respect to the use of colored tubing. The most important thing to understand is that your primary and secondary systems are black and everything else is secondary in importance to the braking systems. As long as your coach is unmodified from its original condition the pneumatic diagram is pictorially accurate. If you have a series of fittings at a device, such as a Norgren valve for example every fitting is of the type and orientation as shown on the diagram. For example, if you look at a valve that has a 45 degree bend fitting on it, the diagram will show that valve with that fitting that you see. Follow the diagram and you will see exactly where that air line goes, and you can literally use the diagram to identify the fitting at the other end and its position on the device it comes from.
Where it gets confusing is the air lines installed by the converter are not identified by colors or numbers. You just have to sort through the “spaghetti” of black air lines to find the origin and end of them.
As far as leak detection goes good luck. We all experience leaks over time and it can literally take hours just to find one leak if you do not know which circuit or system has the leak. You also have to develop an understanding of your systems so you are able to sharpen your focus. For example if the coach is leaning overnight you can isolate your efforts to a specific number of fittings, valves and air bags. But if you find your aux air compressor is running too frequently you may have your entire accessory air system to investigate before you find the leak.
Log in to reply.