[Bill]

I have no air in any of my aux system at present, but the slide seal gauge is still showing 10 psi. Must be a check valve is working properly.

My 02 Marathon was simple, a yellow valve to mix Prevost and Marathon aux air if needed.

My 04 is different due to the slide I assume, I have 2 valves and neither are yellow. I’m still learning the system. Would be nice if Marathon would provide the pneumatic drawing, there’s no secret proprietary stuff in air lines.

[Art]

Guys perhaps the slide type is the difference. I have valid slides. Tom is that what you have or are they Prevost slides. I am nearly positive that marathon air keeps my slides sealed. I know this because when I was on my big trip and had the bus on a ferry for 5 days and then couldn’t get the bus to go into drive… All Prevost air was showing good but the computer display for the slides was showing slides inflating and the transmission would not go into drive until Valid talked me thru unlocking it.

As soon as Leon at Marathon helped me figure out the issue… all was well. On my coach if I loose proper preassure on either slide seal the Valid computer display that I use to open and close the slides displays slides inflating…

I had some issues with mosture on the marathon side in extremely cold weather and I was able to correct the situation temporalily by moving the orange valve AL posted and combine the Prevost air to the marathon air.

I hope that makes sense

Bill

[Bill]

I guess the point all Marathon owners need to understand is how slide seals are inflated and make sure they remain inflated when the coach is out in weather. It doesn’t matter if the slides are in or out because water can get past the seals unless they are inflated.

Like Tom I have a slide seal pressure gauge, but I know for certain on my Prevost slides over time my seals deflate if I am not running the coach or aux air compressor. My coach sits in my garage all summer and I do not maintain aany air pressure unless I need it for something I am working on and over time my slide seals will deflate.

I do not believe there is a check valve between the seals and the valve that can be used to deflate the seals such as when manually moving the slide. It sounds like Tom’s seals, all fittings and the selector valve are leak free.

[Archived]

Jon wrote: “It sounds like Tom’s seals, all fittings and the selector valve are leak free.”

I think that’s because Tom can control all of those parts and pieces with his Smart Phone. The Smart Phone functionality keeps them leake free. Tom please confirm.

[Archived]

Marathon uses their aux air system to keep air supplied to Prevost or Valid slides.

So if you have a Marathon the slide seals get air from your aux Marathon compressor not Prevost aux air.

Later

bv

[Per]

So if I understand what you are saying Bernie is that the yellow knobbed valve allows air from the Prevost accessory system to maintain pressure in the Marathon accessory system when the valve is closed (acting like a one way check valve), but will only allow air from the Marathon accessory system which is pressurized by the aux compressor to enter the Prevost side if the valve is turned? We know Marathon owners have posted by turninng the valve knob prioor to start up that is how they tighten their belts.

Or do Marathon coaches rely on the aux compressor for accessory pressure for the house even when the engine is running because it says not to open the valve unless the aux compressor fails?

A lot of folks read these posts and never question them so we have to be sure the correct information is posted here.

[AL]

There’s no gray area here.

The Marathon aux air supplies house systems and slide seals without the need for Prevost aux air.

If you open the yellow valve you can flood the Prevost air system from the Marathon aux compressor.

Marathon redirects the plumbing for the slide seals so the source comes from their aux system and there is also a check valve in line.

Where everyone gets confused is the Marathon and Prevost aux airs do not piggyback each other on a Marathon.

Later

bv

[Bill]

Lets take this up on the Pneumatic topic.