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Old 03-19-2023, 07:01 PM   #1
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Air issue

Coach was fine last trip until we got home. Unloaded coach and went to back into garage about 30 minutes after shut down. Coach seemed fine but when backing in coach leaned noticeably to driverís side. Once in garage, I Drained air and leveled coach with jacks.

Three weeks later i retracted jacks and cranked coach. As air came up coach seemed fine and then suddenly began leaning to driverís side. It appears the entire side is loosing air. Ideas or suggestions appreciated.

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Old 03-19-2023, 07:04 PM   #2
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To start:

Run engine until the air dryer purges.

Turn off engine and walk around listening for air leaks.
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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Old 03-19-2023, 08:08 PM   #3
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Spartan Chassis
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Originally Posted by wolfe10 View Post
Run engine until the air dryer purges.
Turn off engine and walk around listening for air leaks.
I had similar symptoms on my '09 Diplomat 42SKQ (RR8R chassis).

I discovered the source (left front air bag leak) using the procedure suggested by wolfe10.

I discovered mine just a couple of weeks before a 3 month trip and the replacement air bag was not in stock at many of the usual sources. When I did finally locate one, it came at a premium price and I needed to expedite the shipment (at added cost).

Good luck.

Take care,
"I would rather have questions that can't be answered than answers that can't be questioned."
2018 Anthem 42DEQ
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Old 03-19-2023, 10:51 PM   #4
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1. If the coach leans when the engine is on: 1) Ride heigh valve could be wrong
2) Major air bag leaking
2. If the coach doesn't lean when the engine is on, most likely you have a small leak in air bag, or a line down stream close to the air bags

It may look like the entire side is leaking, but my experience is if the rear air bag sags, it drags the entire side down, make it look like front is sagging too, but in fact the front is fine. It is rather unlikely, both front and rear leaks on the side side at the same time.

In my case, my driver rear side is leaking on the HWH air leveling manifold, but you said about jacks, more than likely you don't have air leveling. This may not be your issue.
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Old 03-26-2023, 09:02 AM   #5
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My jacks and leveling system work fine. I am going to try to trouble shoot today. When the air first starts to come up all is fine. Then all of the sudden coaches begins to lean to drivers side. Last time I do not remember the system purge.
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Old 03-26-2023, 02:55 PM   #6
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When I had to work on air leaks on my rig I built 6 ramps so I could elevate the rig to be able to work safely under it. I used 2X10" boards cut 42, 36, 30, 24". I stacked and screwed them together. I also fastened a block at the end of four of the ramps so when I backed up on them I wouldn't drive off.

I'd recommend getting a spray bottle of soapy water and start spraying everything down. The system uses a different valves to maintain air pressure if there was an air line blow out. I was loosing air pressure that got progressively worse. At one point my air system would loose enough air in ~30 minutes for the low air alarm to go off if the engine wasn't running. I ended up finding all 4 of my pressure protection valves (PPV's) were leaking.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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