[Archived]

Dump the tag Peter, that’s the only way you’ll gain on it. Or, as the compressor gets close to popping off the dryer, hit the raise while you have close to 125 psi and it will come up just a little. You won’t find anything wrong, it has 259 bags put on by the owner prior to me and is just heavy.

PS – Unload some of that horse stuff in the bay and move the beer to the rear.:)

[Peter]

Thanks Tom tried to call u but not there just getting ready to get on the road so last minute checks replaced some more air fittings with compress fittings replaced fan bellow below fan hard to change new air bags on gen. But could not get coach to raise up in front much just wanted to check put check valve in on air bellow for engine fan and belts

PS moved beer to rear through out horse gear put shorts and sun glass in should be good to use in Michigan next week take it to royale next week for some of the floor lights then starts the 38 week marthon of traveling for my business all across USA east west north south plus all of Canada u think I would get tired of it this is the 25 year lot of miles every year but lots of fun

[Archived]

I disagree with Tom.

If your front axle is within the Prevost weight limits you should be able to use the level low to bring it from all the way down to all the way up without raising the tag. Lifting the tag facilitates lifting the front end by reducing the weight on the steer axle but is not necessary if the coach has the right size air bags and pneumatic pressure is up where it belongs (about 120 PSI.

Just keep in mind the front end is not going to leap up to the fully raised height. It takes a few minutes, more if the coach has the small tanks supplementing each air bag.

If if will not raise fully after some time make sure your air pressure is reaching 120 PSI. Some coaches had the wrong air bags installed but I don’t think your coach was one of them but in some cases that is an issue, and coaches that are overweight on the steer axle will be difficult to raise.

[Tom]

What do you disagree on? It won’t raise easily in spite of having the correct air bags and the valves working properly. My 94 was the same and the XL2 I now have is just about as bad, the front end will come up, but requires high pressure and coaxing. Even Bill Jensen explained some time ago it wasn’t designed to raise, that’s why it’s call Level Low. Out of 5 buses and different converters, I had one that would raise easy and that was the CC.

[Archived]

Thanks Tom and Jon just thought I would ask pressure is good it might raise one inch maybe with tag down have not tried it with tag up when u push up button it will raise up fast to ride height or should I say about 3 inches then it is very slow when u release button it kind of drops down just a little,back will go up so fenders are above tires so u can take tires off but the front will not go above fenders with tag down

[Gerald]

We might be dealing with different opinions of time. At the beginning and end of every trip I have to drop and raise the front end on my coaches.

If I don’t I either drag the belly or knock off the satellite dish.

I have NEVER raised the tag to encourage my coaches to lift in the front. It takes a couple of minutes to lift but it goes 3 or 4 inches past the driving height. When raising the front returning to the garage I put it in level low and raise the front while I am backing up the driveway. By the time I reach the top it is all the way up despite the fact the weight that shifts over the front axle due to the slope of has got to be considerable..

When I raise the front I know I am fully up because the compressor cycles off and the air dryer spits.

The 97 had about 14,000 on the front, the current one has just shy of 18,000 on the front. BTW, to be sure I am not going to wipe out my satellite or spoiler or the top of my door opening I am always starting to raise the coach from zero pressure in the air bags because the level low is in the manual position with all three position switches “down” until I intend to raise the coach so maybe I just expect it will take some time to raise.

[Tom]

My Royale front goes up about 4 inches. Here is how I know when it has picked all the way up using level low. I watch the aux. air guage. The pressure goes down as the front starts to raise. When the aux air reaches the same pressure as the primary guage the front is as high as it goes.

[Georges]

I do not have an air pressure gauge in the steer compartment for the LL system, but there are 2 in the Aqua Hot bay. One I know is for the small air compressor located there, the other I am not sure, is it the one for the LL?

BTW, my air compressor seems to cycle on and off quite a bit, and even more so on cold days. Perhaps a leak exacerbated by shrinking lines when cold?

Also, the left rear seems to always get lower and faster than the other 2 points, so I probably have another leak in the system.

[Georges]

In the absence of an auxiliary air pressure gauge in the dash, some owners or converters have added one, usually in the steer compartment, but the gauge could be anywhere you have aux system pressure.

There is no difference between aux air for the house or chassis in terms of pressure unless it is regulated. Our coaches have regulated air pressure for such things as belt tensioners, floor slides, generator air bags, and pocket doors for example. As long as the gauge reads unregulated aux system pressure that is what you will use to determine the health of your aux system and measure the leak down rate.

The level low system pressures are not measured because they won’t mean much. The suspension can have anywhere from zero pressure to max bus air pressure and anything in between depending on what you are asking it to do and at any given moment the pressure at each corner can vary.

Cold temps will always show leaks before they are seen in warmer temps, probably due to shrinking and hardening of seals and O rings. That has always been the case.

[Charles]

Cold air temps today probably the reason this thing is leaking loudly enough for me to have been able to pinpoint the source (see pic)…..it is leaking from the top of the little glass moisture collector (with the name Crafstman )probably right at the seal.

Can you tell me what this item is and what is the function of the air compressor underneath, I know it has something to do with the air toilet but what if anything else and where can I buy a replacement ? Thanks.

[Archived]

That Gast Compressor is your aux air. The small gauge with the regulator is for the Microphor toilet and it’s regulated to 60 psi. The other gauge is your aux air pressure whether your engine is running or your just using the aux compressor. The site glass is a filter to remove moisture created by your aux compressor and needs drained OFTEN. Your aux compressor will make lots of water daily and will contaminate your air system if not serviced and drained. The black box is the regulator for the aux compressor and should be set for around 60/90 cut-in and cut-out.

I got rid of all that nasty old metal pipe and fittings, they were a constant source of leaks and corrosion. Peter’s Royale (my old one) had a smiliar setup as yours.

[Peter]

Yes, I drain that site glass daily as it accumulates at least 1/4″ of moisture. The cutout seems to go off at around 120 lbs, maybe this is set too high?

Thanks for clearing up the mystery of the smaller gauge, now I know a lot more thant I did this morning!

[Archived]

Tom is right drain it often sometimes twice a day I do it also Tom did a very nice job when he did the work on his coach that I now own I have just about replaced all fittings with compress fittings that were push fittings just about no air leaks now like I said just about aux comp does not run very much unless I use toilet a lot

[glen]

Peter I am confused, if you have the switch in the drive position how can you lower or raise the coach to anything other than the drive height?

[Archived]

I am not doing it while its in drive position was just saying it would go to drive height when switched to manual it would go down or lift up to about drive height but did not seem to lift it much past that did better when I lifted the tag it would go up about two and half inches lift about one inch with tag down