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Old 07-26-2015, 04:32 PM   #1
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1993 33' Land Yacht
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Losing air from leveling system

I know this subject has been discussed before, but I'm at a loss as to what to do or try next to control the air loss. This is what I have done already.
I have checked air lines, connections, airbags etc. with soupy solution could find no leaks. Have taken to two other shops and had tested they could find no leaks. Contacted Andy at Inland and purchased a new inline Air check valve, no difference. Was told by one of the repair shops that the holding tank may have a pin hole in it, so I had them replace it. That also made no difference.
The strange thing is, once in a while the coach will stay up for a day or two but most of the time it will be all the way down overnight. I can't figure out how it stays up once in a while, yet has such a large leak that it can go flat in a couple hours. Has anyone experienced a similar problem? Or a possible solution?
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Old 07-26-2015, 05:39 PM   #2
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Are you talking about the HWH jack leveling system or the airbags for ride control?

I had a loss in air pressure on my rear air bags. Or at least that what I thought. Turned out to be a break in the air line that went to the air pressure gauge. The air bags were inflating but the gauge showed no pressure. Found the break behind a thermal shield blanket by the radiator. Once I spliced in a connector at the break, all was good again.
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Old 07-26-2015, 06:03 PM   #3
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The air bags for Air ride. My compressor pumps right up to 95lbsand turns off. Its almost like if it stops in a certain position, it will hold the pressure, but if not in the right spot it loses its air.
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Old 07-26-2015, 06:06 PM   #4
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Have you replaced he leveling valve(s)? That was the major problem on the 310 that I had. Once I replaced the valve it stayed up for several days at a time.
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Old 07-26-2015, 07:20 PM   #5
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Air leaks can be maddening to find. I have had two motorhomes with air suspension issues, one an '83 Airstream 310, the other a '75 GMC. I bought the 310 at a very good price, I think because no one could find why the rear end would not stay up, and the owner got so frustrated he dumped it.

The leak in the 310 that was most difficult to find was in the internal check valve in the compressor. I also had issues with the external check valve on that rig, causing other problems. Once I got it set up right, it would hold air pressure all winter when in storage for the season.

On the GMC, same deal, the internal compressor check valve. But on the GMC, a PO had added a air pressure gage inside so you could see what the pressure was running. After a lot of messing around I found that the rubber hose which went from the air tank to that gage was leaking all over. You could not see it, or hear it, but when you put soap solution on it, it bubbled like mad. I replaced it and could hold air for a month when sitting.

I never had leveling valve issues but they are a common problem, and hard to test for leaks, I understand.

All I can tell you is that isolation of parts and lines is the best way to find issues. Disconnect and plug lines, check if the system pressure goes down. If it does, work on that section. Remember, you may have multiple leaks too. Finding one does not mean the problem is solved. My GMC with it's elaborate air suspension and leveling system almost made me cry until I found that damn hose to the gage.

Best of luck on your hunt.
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Old 07-26-2015, 10:24 PM   #6
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I'm going with the leveling valve also. It is the part of the system that is constantly moving and there are several ports that must seal. You can attempt to spray the valve with soapy water but also put a hose on the exhaust port and put that in a can of water and watch for bubbles from an internal leak. Also remember that many of these valves have a 10 to 15 second delay to avoid discharging air at every bump. It takes patience.
Good luck.
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Old 07-27-2015, 11:01 AM   #7
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I haven't replaced the leveling valve. I have asked the shops to check it out as the possible problem but they could find nothing wrong with it. I have seen someone post the part number for the leveling valve and where to get it, but didn't find it yet.

The compressor internal check valve sounds very possible, and will look into that. Are these parts still readily available for these compressors or just complete new replacement?
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Old 07-27-2015, 05:38 PM   #8
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Found out they no longer have repair kits for my model air compressor. Has anyone replaced their compressor? If so what kind and where did you get it? Still haven't been able to find the post about Leveling Valve replacement part and source either, so if someone has any info on that would also be appreciated. Thanks for the in put from everyone, this has been a big pain in the butt.
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Old 07-27-2015, 09:47 PM   #9
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This is the compressor I use. VIAIR 450C IG Series Air Compressor Kit (12V, Intercooler Head, 100% Duty and Sealed) [45050] | $278.95 | SD Truck Springs | Leaf Springs, Helper Springs and Suspension Parts It's probably overkill but I like the 100% duty cycle at 100 psi. I've had it for several years with no problems.

Here is an assortment of leveling valves. https://www.heightcontrolvalve.com/m...-and-rv-30.htm They all do pretty much the same thing but matching the mounts makes the job easier. I can't say for your coach for sure but mine has a delay built in so you are not dumping air at every bump in the road. If you get yours out they should be able to match it .
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Old 07-28-2015, 10:45 AM   #10
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1984 27' Airstream 270
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Our compressor was disconnected before we bought it, we have to pump it up with a hand pump (keeps us fit) or at the garage. Recently we had a problem where it went down over night, I replaced the air inlet valve that solved it a bit, replaced the gage & that seems to have done the trick. The strange thing is we replaced the airbags with brand new ones last year & have only had a problem since then. If anyone has replaced their compressor on a 270 we'd like to know which one you used.. Thanks
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Old 07-29-2015, 09:00 PM   #11
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Thanks for the information on the leveling valves, I was able to match one up as a replacement. The information on the compressor was also quite helpful, my original compressor was made by Thomas Industries a TashAir compressor replacement was $955.50. So if the leveling valve doesn't help the ViAir compressor you recommended looks like a good replacement option at a lot less money. Thanks again Dan and I'll let you know how things work out on the air loss.
Randy
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Old 07-29-2015, 10:23 PM   #12
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Anytime Randy. As a point of interest I was reading somewhere that a minimal air loss in new air springs and leveling valves is acceptable. Also an air brake system on a truck is allowed a small air loss. The CDL drivers daily inspection requires an air loss test with the system up to pressure and the engine off and another test with the system up to pressure, engine off and brakes applied. A couple of lbs. loss over three minutes is acceptable. I would have to look up the exact numbers as they are different for static, brakes applied, and trailer connected and I have slept many times since I last had to do an inspection.

It is nice to have a tight system that keeps the suspension inflated for extended periods but a slow bleed down does not necessarily mean the system has failed. These systems are designed to have an onboard compressor to continually supply the necessary compressed air.

It's time to go camping.
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Old 08-01-2015, 02:30 PM   #13
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Dan, when ordering the leveling valve from Dayton Air Control Products, I was talking to one of their Tech's Rob. He said it was unusual for these switches to ever leak unless , (1)they were a plastic body version, which I don't have or(2) they are so old that the gaskets had become brittle and hard. While talking with him the information on the valve that was to replace mine said it was non-dumping. My valve has this black plastic hose on it that I thought was where the air was dumped out when you put the coach up on its jacks. He said no that that air noise release was from the solenoids on my Leveling jacks which are HWH and that these solenoids on the jacks sometime leak air. I called HWH to check that information out, HWH has a two to three week out return call back up so I haven't heard back yet.
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Old 08-01-2015, 03:26 PM   #14
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It always amazed me how HWH can be so backlogged all the time. Really a little annoying. I had to wait 3 weeks for a call back just to let me know I can send a jack back for rebuild. Really poor customer service if you ask me.
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