[Bill]

this valve is under the drivers seat area in the lower door in the steering box compartment.

[Sid]

What does it control??

[Archived]

Marathon is very good at labeling what this valve is for as seen in your picture along with desired pressure

Regulator has a number on the back side . The manufacture is most likely SMC. Having replaced several on our bus each one should be replaced with the same internal set up. Remove the regulator to get the part number.

At this time nearly all have been up dated.

If you post the existing number I can get the current SMC replacement available. Price under $400

[Peter]

It’s the floor air slide Peter, have you been to the eye doctor?:)

[Sammy]

The pic wasn’t up when I asked !!! Ha. Ha take that….

[Archived]

Thanks for the great information my valve is a norgren and so far I have obtained a suitable replacement for it how ever I did forget to see where the regulator was set at. Any ideas.

[Archived]

Start at a low pressure and keep adjusting it up until you feel the movement of the floor slide is acceptable.

Too much pressure and the floor slide will open and close with considerable speed and force.

[Kevin]

“Too much pressure and the floor slide will open and close with considerable speed and force.”

We rented an 89 Prevost Country Coach XL last year. The floor slide did just like you said. We could have used it to slide steel tubing!

[Archived]

Ok so I actually answered my own question as I was installing the new regulator and noticed the label which read ” Max 60 PSI” and thought I may need to borrow Peters glasses. Thanks for all the help all is well with the coach for now.

[Archived]

I am new to the site and still in my Prevost learning curve – as if that will ever end. So, since I am not sure I’m qualified to give advice, I will just tell a story. This winter, on a very cold day, I started up the coach and it sounded like someone was banging on the engine block with a big hammer. I quickly learned we had a frozen line somewhere and could not get the coach to air up. This was due to condensation build up. The converter who does some of our work suggested adding pull drains to the tanks. So, for a couple hundred bucks, we added pull drains to the bottom of each tank. The cables come out just behind the front wheels and both back tanks just in front of the passnger side drive wheels. Most commercial tractors/18 wheelers have these. Now, as part of my pre-trip walk around, I give each cord a tug and drain any condesation that might be in the lines. I think I’m doing the whole system and the air dryer a favor. Hopefully we can keep lines dry now.

[Tom]

The dryer doesn’t care if your air system has enough water to swim in.

Your post scared me because if you had enough moisture in the air system to do what you said it is possible you need to start with replacing the dryer cartridge, and then need to find out if your aux system water trap has water in it, and then you need to assess the coach to see where else you have moisture.

One of the most overlooked maintenance items is the air system. Our coaches call for a lube every 6200 miles or so and that is the ideal time to drain the tanks, not only to get out moisture, but to check the various protection valves. If your mechanic doesn’t do that or understand how to check the protection valves by draining the tanks, get a new mechanic.

If you store the coach with the aux compressor on that is almost like hooking the garden hose to the air system. The aux compressor will introduce a lot of moisture to the system and the water trap and aux tank both need frequent checks and draining.

Moisture not only can freeze and mess up the operation of all the valves in your complex air system, but it corrodes valves and at some point screws up the operation of just about everything that is part of the pneumatic system. $$$$$$$$$$$$$$$$$$$$$$$

[Archived]

Putting pull drains on the wet tank and the aux tank ok I would not want them on the primary and secondary tanks they can stick open , prevost will not put them on

[Robert]

I always put one on the wet tank and that pretty much takes care of things.

[Archived]

Peter and Tom.

I’m not opposed to putting the pull drains on any or all tanks but my greater concern is people with them will pull the drains daily and actually think they are done with air system maintenance. Everyone needs to understand that the dryer element or dessicant need to be changed (I am on a 2 year schedule), the aux compressor moisture trap needs to be drained, and that they actually need to see what is coming out of their tanks so they will know if the dryer element is in fact doing OK or needs to be changed. Also how many realize that the tanks need to be completely drained of air pressure to see how much moisture if any has accumulated?

Apart from changing the dryer element a few minutes of tank draining periodically is all that is necessary to keep or verify the system is dry.

[Jim/Chris]

I agree Jon I myself change the dryer filter every 15,000 miles that’s just me and drain the tanks every two weeks sometimes every week