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Old 03-31-2013, 10:37 AM   #15
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The way I determined the tank pressure was with a tire guage on the tank drain\schrader valve. If I let out all of the air, the compressor comes on and pumps it back up to110. I tried moving the valve arms but they won't move up further unless I take off the nuts which should be high enough anyway. The other way it seems like I'm putting too much pressure on them to get them to move. This may be a clue. These valves must be the initial source of air as per the diagram so I'm going to start cracking the fittings loose and tracing the air. I also am going to remove the nuts on the control arms to see if I can get them to move up further.
Dennis just pull that hairpin clip and slide that actuating arm off the threaded adjusting rod. The weight of that arm is enough to open and close the valve. There should be virtually no resistance at all to move that valve arm up and down, maybe just a couple of ounces of pressure to operate the valve. Remember there may be a delay in the valve so once you raise the valve arm you might have to hold it for minute before you get air flow.
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Old 03-31-2013, 08:22 PM   #16
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I did that very thing on the curbside valve. The arm was easy to move up, and when I did the bags filled up. yeah! I then tried the street side one. It only seemed to work to let air out. The bags are up now so tomorrow I am going to test drive it a little. I will give you an update afterwards.
Thanks, Dennis
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Old 03-31-2013, 08:37 PM   #17
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Dennis,

From your description it sounds like one valve filled both air bags. I was under the impression that each valve handled one air bag.

Can't wait to hear the results of your test drive!

Brad
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Old 04-01-2013, 07:40 PM   #18
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The test ride went great. The bags are up and it rides real good. My next step will be to let all of the air out of the bags , and then see if the opposite side valve will air them up. When I tried it before the bags possibly were all of the way up. I will let you know what happens.

Dennis
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Old 04-01-2013, 08:05 PM   #19
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The test ride went great. The bags are up and it rides real good. My next step will be to let all of the air out of the bags , and then see if the opposite side valve will air them up. When I tried it before the bags possibly were all of the way up. I will let you know what happens.

Dennis
Dennis,

I stand corrected. I just looked at the air diagram again and it looks like either valve can add or remove air from the air bags. The leveling valves are located on the tag axle so I'm guessing that if a valve senses that one side is low it adds air to force the whole back end up. It doesn't correct for lean side to side which is what I though the separate valves were for.

Glad to hear your test drive went well. Sounds like you're on the right track!

Brad
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Old 04-02-2013, 09:30 PM   #20
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The other valve will not air up the bags, but it should. I loosened both lines at the valve and no air came out. I ran out of time, but will be back at it soon. I will keep you posted until the problem is solved.

thanks for your support!

Dennis
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Old 04-02-2013, 10:55 PM   #21
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The other valve will not air up the bags, but it should. I loosened both lines at the valve and no air came out. I ran out of time, but will be back at it soon. I will keep you posted until the problem is solved.

thanks for your support!

Dennis
If both valves work together it's possible one failed and the PO merely disconnected it rather than replace it. You will need to trace the air line back to the tank to determine if it was damaged or disconnected or both. The 280's and 310's all operate on one leveling valve. You should also check the adjustment to make sure the coach is riding at the proper ride height.
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Old 04-02-2013, 11:51 PM   #22
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(snip) The 280's and 310's all operate on one leveling valve. You should also check the adjustment to make sure the coach is riding at the proper ride height.
A friend had an '81 280 which had two leveling valves, one for each bag. My '83 310 had but one leveling valve which operated both bags. So, AS made some change at least between '81 and '83. They were experimenting on them as they went along, I think.
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Old 04-03-2013, 01:53 AM   #23
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A friend had an '81 280 which had two leveling valves, one for each bag. My '83 310 had but one leveling valve which operated both bags. So, AS made some change at least between '81 and '83. They were experimenting on them as they went along, I think.
From what I understand the early 280's had a system with the bags mounted on a fore and aft link on each side and each side operated independently. I don't know who made that system, I have seen pictures of it. I think some Argosy's had an over load bag mounted on a bracket from the frame to the axle. From '82 on they used the system by American Carrier Equipment. That system cuts several inches off the rear of the leaf springs and hangs a cross member from the rear of what is left of the springs. The cross member becomes the bottom mount of the bags and both bags are controlled by a single valve. A version of this system was used on the 310's and 34.5's. I don't know how long they used this system. I believe all the rest of the 280's and all of the 310's used it and I have yet to hear of a 34.5 that had a different system. I have to add that about the only time we hear about air bag systems here on the forum is when they have a problem. Maybe Airstream found another system that never fails that we don't know about.
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Old 04-03-2013, 04:47 AM   #24
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My 79 Excella has 1/4 elipcial springs and independant valves left and right.
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Old 04-05-2013, 11:39 PM   #25
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OK, the problem is definitely the valve. I removed it and it is getting air from the tank. The line from the bags is also clear. I took it apart cleaned it and lubed it up with WD40 and then reinstalled it. All it does now is leak air out the discharge port. Is it possible to get 2 new ones just like the old ones?
Thanks, Dennis
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Old 04-05-2013, 11:58 PM   #26
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OK, the problem is definitely the valve. I removed it and it is getting air from the tank. The line from the bags is also clear. I took it apart cleaned it and lubed it up with WD40 and then reinstalled it. All it does now is leak air out the discharge port. Is it possible to get 2 new ones just like the old ones?
Thanks, Dennis
Give these guys a call.

King of the Road - Height Control Valve for Suspension

They can talk to you about valves.
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Old 04-06-2013, 11:53 AM   #27
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THANKS! I called them and am in the process of figuring out which are the correct ones.
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Old 04-09-2013, 11:52 AM   #28
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They had the right ones in stock. They are shipping them to me now.
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