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Old 10-29-2018, 06:43 PM   #15
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Put the gauge directly on the compressor output first to check it out. It might save you a lot of time digging into the rest of the system. Is your coach on a P-30 chassis or something else?
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Old 10-30-2018, 08:42 AM   #16
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My coach is based on the P30 with a TAG axle.


Started the diagnostics today. I pressurized the system to 130psi using my shop compressor and found my first problem. The service air chuck on the side is leaking. Couldn't hear it over the noise of the engine running and the compressor pumping but was easy to locate with the system pressurized and nothing running.



With the system fully pressurized, the air bags are holding height and pressure at 95psi. Did verify that the inside pressure gauge maintains pressure reading even when the air tank is empty so this does confirm that the gauge is actually reading the pressure inside the air bag and not the system pressure. I'll check to see what the compressor can put out but I'm pretty sure I'll still replace it since it's 26 years old and there's a fair amount of corrosion around the fittings. Newer compressors are more efficient and higher volume as well.
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Old 10-30-2018, 09:40 AM   #17
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Well that was easy! Good job
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Old 10-30-2018, 09:59 AM   #18
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Not done yet. Found the check valve to be defective as well.
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Old 11-02-2018, 09:20 AM   #19
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Saga continues. I ordered a Viair check valve that should arrive some time today. I did replace the leaking air chuck and ran the compressor without the check valve. The original compressor was able to pump the system up to 105 psi and than it shut down the compressor. That's something that hasn't happened for some time now so glad that the compressor looks to be in working order.



I still have a small leak in the system that needs to be addressed. If I pressurize the system it only holds pressure for about an hour before it's back down to 0 psi in the reserve tank. Air bag pressure remains constant though. That's with a cutoff valve in place of the check valve. I pressurize the system using the house compressor and isolated the system with the cutoff valve. The compressor is completely disconnected so no back bleeding through that. The problem is I can't hear any leaks. Not that my hearing is as good as it should be.



Once I get the check valve installed I'll start trying to find the remaining leak. My approach will be to isolate components in the system from the air valve back toward the compressor and see where the leak is originating. First step will be to make sure the air isn't bleeding down through the air horn solenoid since it's easy to isolate without crawling under the coach.



I've picked up 50' of 1/4" DOT air brake line and some 1/4" NPT to air line push-to-connect fittings. I'll start by cutting off air to the leveling valve. If it holds pressure than I know it's around the leveling valve. If not, than it's something associated with the air tank. I know it's not between the leveling valve and the air bags because the bags hold pressure over night with no problem.


If it does turn out to be the air valve, does anyone know of a good source to pick one up? How to identify the one that's currently installed? Best way to replace it? I think I only have one air valve on the curb side that controls both TAG axle air bags.
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Old 11-02-2018, 12:26 PM   #20
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If you use the blue box search function on the top of this page it will bring up many threads on the air valve. I punched in "Motorhome suspension air valve" and got a page worth of hits from Airforums

Here is just one that is specific to the LY

http://www.airforums.com/forums/f312...elp-72228.html
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Old 11-07-2018, 06:33 AM   #21
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OK I've found the source of the last pressure leak. Turns out that the pressure switch has a leaking diaphragm. Will be replacing it with a Viair model 90110 pressure switch. Picked on up for just under $20 shipped. Eliminates the old pressure switch, solenoid combo since the new unit contains both in one component.


I'll post pics of the test fixture and the final setup once it arrives.
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Old 11-07-2018, 10:42 AM   #22
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Great news and a relatively inexpensive fix.
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Old 11-09-2018, 10:48 AM   #23
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Got everything ready for the new switch/relay combo. All the connectors are in place so all I need to do it screw it into the air line tee and connect 4 wires. Tracking shows that it arrived at the house today.



I did pressurize the system to check for leaks again yesterday. Connected the air horn and, for the first time in 2 years, it blew loud and clear. Had to replace the air solenoid and both electric horns since they were damaged when the horn switch shorted out and kept them on until the battery died while I was away. Horn switch problem turned out to be a cracked turn signal cancel switch in the steering column. Had to remove the steering wheel and the locking ring to get to it but it was a common part and otherwise an easily replaceable part. Autozone's tool rental program really helped out. Was able to rent both the steering wheel puller and the locking plate compressor for a net $0.00. You have to pay for the tools in advance as if they were new, but they credit you back when you return it. I've rented a bunch of tools over the years.



Finally getting ahead on the repairs. Seemed like it was something new every time I checked. The "TO-DO" list is getting smaller now. Items remaining are getting less critical but I'll be diligent since I'm on a roll now.
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Old 11-12-2018, 09:02 AM   #24
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Any way I can know what replacement airbags are needed for my MH? They're holding air right now but I do see some cracking and would like to replace them in the near future. Wanted to pick them up in advance of pulling the old ones out. Air Stream has been little to no help over the years with trying to find part numbers so I'm hesitant to call them.
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Old 11-12-2018, 11:26 AM   #25
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Here is an explanation of how to identify air bags. https://www.sdtrucksprings.com/ident...ir-ride-spring
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Old 11-12-2018, 12:54 PM   #26
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Judging from that link I'm going to have to pull at least one bag to get the identifying numbers in order for me to order it. Thanks for the link. It will, at least, tell me how to order what I need.
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Old 11-12-2018, 01:46 PM   #27
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There are part numbers around here for 345 bags but I don't know if they would be the same as yours. The bags are pretty easy to change IF you can get to the fasteners on top. Many have cut holes in the floor to access from above depending on your floorplan. You might call American Carrier to see if they can help.
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