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Old 08-01-2015, 07:18 PM   #15
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1993 33' Land Yacht
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I agree with you completely. When I didn't hear back from them after three days I called back and that was when they told me about the two to three week back log, I thought why didn't you tell me that on the first conversation. I really like the way the HWH system works (when it works) and they are supposed to be a very good product, top of the line. But if half of their units in service are like mine with all it quirks I can believe they can be that back logged. Yes very annoying!
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gloran - 1993 LY MH 33' - Banks System, Steer Safe, IPD front stabilizer, Super Steer - Bell Cranks, Motion Control, Coil

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Old 08-01-2015, 09:04 PM   #16
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1982 28' Airstream 280
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You will have to refresh my mind a bit. Are you on a full air suspension or springs modified with air bags in the rear and coils with air bags inside the coils up front? If full air is your leveling with jacks or by controlling air bag height?

Usually with an add on system like the older classics you don't dump the bags, just extend the hydraulic jacks to level. They have solenoids but no air in the system.

My understanding is that the HWH system with full air used the air bags to level not jacks. There are many new systems available today but I don't think they were available back in the early 90's.

Like the guy said these valves are pretty dependable but your coach is 20 plus years old so seals do get old. Many years ago you could get kits to rebuild leveling valves but as the cost of labor grew to exceed the value of the valves that all went away. The small tube is just the release air for valve adjustments while going down the road, to dump air you would need a much larger port as it would take a long time through the little tube.

Talking to technicians can be difficult sometimes because they are used to dealing with new systems rather then our old antiques. Over the hill types like me don't keep up with the new stuff but are more comfortable with the simple older stuff.
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Old 08-01-2015, 09:35 PM   #17
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Dan, my coach is a modified air ride the rear end has no springs. The front end had the coil springs with air bags inside that I replaced with the Henderson coil springs that eliminated the air bags. My HWH is hydraulic and do not use the rear air bags for leveling, so when pressure is taken off the rear end the air is dumped from the system.
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Old 08-01-2015, 09:57 PM   #18
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Unless there is a dump control I would guess that the valve is just releasing air trying to level the coach because the valve is sensing the coach is too high. A dump valve will lower the coach all the way to the stops in less then five seconds. For an example find a local transit bus that has a kneeling front end for the handicapped, they drop down right now.
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Old 08-26-2015, 05:48 PM   #19
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Dan, have you ever heard of the line leaking behind the dash air gauge? and if so how does one go about removing the gauge to check it?
No luck in finding the leak. I replaced the compressor and rear levering valve and I am still losing air somewhere, checked every thing in the back and don't think its leaking any where back there, must be up front somewhere.
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Old 08-26-2015, 09:10 PM   #20
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My dash gauge is fed by a 1/8" plastic line which I assume has a compression fitting however I have never had it out so I can only guess without crawling under the dash. I did add a small regulator up front to feed the bags in the front springs. I cut the 1/8" line and used a push in type "T" and other push in fittings to connect the regulator and bags. I don't think there was much in the way of push in fitting available 33 years ago when my coach was built.

My system pressure will drop some overnight but the rear bags will hold for several days. As I have said these systems are considered to be acceptable with a certain amount of leaking. When you are parking do you set the jacks or just shut the engine off? If your jacks are not set I would guess the problem is between the bags and the leveling valve. If the valve arm is indicating the proper ride height even with no air in the tank the valve will hold the air in the bags. If you set the jacks that will tell the valve the ride height has changed and it will try to release air to correct the height.

You might try parking with jacks up and drain the air tank and see if the valve and bags hold. You could even pull the discharge line from the compressor to see if any air is leaking back. Another test would be to disconnect the bags from the valve and install a temporary Schrader valve and inflate the bags and see if they stay up. It gets a little tedious but you should be able to isolate the problem.

Another thought is find where the gauge source is connected at the rear of the coach and disconnect it to isolate it from the system.
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Old 08-27-2015, 07:33 AM   #21
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While trying to find the leak, I have been just turning the key off, after the system is fully inflated. It wouldn't bother me if it lost a little pressure, but it usually all the way down over night. Thanks for the suggestions, I will let you know how it goes.
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