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Old 02-17-2003, 07:58 AM   #15
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1997 30' Excella
1983 31' Airstream310
Austin , Texas
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check valves

Inland RV carries them
or check for a distributor for Generant
http://www.generant.com/icvspec.htm
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Old 02-17-2003, 10:36 AM   #16
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We replaced our compressor and bags when we first got our MH as to the manuals we were VERY lucky that the PO had the manuals for every piece of equipment on our rig. We have wiring diag., engine, chassis all appliances incl the built in vacuum.
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Old 02-17-2003, 05:24 PM   #17
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1997 30' Excella
1983 31' Airstream310
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more on the air bag system

In 79 and 81 Airstream used a different system for the airbags than on the later models. Each Airbag has two valves, one mechanical (leveling) and one electrical solenoid valve (to close the air line with ignition off).
The great advantage of this early system is the ability to level from side to side, as well as up and down.
If Sam has this system on his 81, it would also suggest that the solenoid valves are bad, leaking or disconnected, due to loss of pressure with ignition off.
Properly working solenoid valves also allow you to dismantle the pressure lines all the way up to the solenoid valves and never loose pressure in the airbags.
On this system, the small inline check valve only comes into play when the ignition is on (open solenoid valves) to prevent back leaking into the compressor.
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Old 02-18-2003, 12:29 AM   #18
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Thanks for all the info, Peter and everyone! Putting the check valve between the solenoid and the airbag should work-around a leaking solenoid valve, though, right?

Also, after taking her out this past weekend, it seemed to bottom out much less. I think the poor clearance may have been due to the low pressure in the front bags causing the rear to level out to that level.

I don't have the service manual, but my AS did come with a really complete set of manuals, including the chevy chassis manual, which gets pretty detailed.
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Old 02-18-2003, 06:54 AM   #19
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1983 31' Airstream310
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Sam,
the inline check valve should NOT be placed between the solenoid valve and the airbags.
The best place for the inline check valve is between the pressure regulator and the compressor.
Increasing ride height in the front would theoretically decrease your height in the rear, which would be compensated by the mechanical leveling valves.
The ride height of the rear airbags is determined by 1 pressure of the system (80-100psi), 2 adjustments to leveling valves and adjustments should only be attempted by someone with complete understanding of the system.
Do you hear a clicking sound in the rear when you turn your ignition on?
Extended non-use could affect the seating of the solenoid piston, which sometimes takes care of itself when being put back to frequent use.
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