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Old 01-24-2022, 08:29 AM   #155
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I forgot to mention that airbags air up immediately each time I returned switch to up position.
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Old 01-24-2022, 08:44 AM   #156
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I scrolled through this thread and finally found where you posted the engine make/model/year about half way through. You might want to put your coach engine information in your signature line.


You have a 1999 Cummins 8.3L engine.

You can go onto the Cummins Quickserve site and create an account. Then put in you engine SN and you will have info to lots of information including the compressor. https://quickserve.cummins.com/qs3/p...rts/index.html

With enough digging you can get a part number and it may possibly have a complete breakdown of serviceable parts including the unloader valve. I seem to remember someone posting that it can be removed separately without removing the compressor.

I just looked at the compressor on mine and the compressor head assembly can be replaced separately.
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Old 01-24-2022, 09:03 AM   #157
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Quote:
Originally Posted by jacwjames View Post
I scrolled through this thread and finally found where you posted the engine make/model/year about half way through. You might want to put your coach engine information in your signature line.


You have a 1999 Cummins 8.3L engine.
You can go onto the Cummins Quickserve site and create an account. Then put in you engine SN and you will have info to lots of information including the compressor. https://quickserve.cummins.com/qs3/p...rts/index.html

Thank you! ��
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Old 01-24-2022, 09:06 AM   #158
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I'm on the side lines cheering you on. Hope you get this fixed quickly!!
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Old 01-24-2022, 02:49 PM   #159
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UPDATE Back in action

The mechanic determined that there is some kind of obstruction in the air tank plumbing up front.
To get us in the road he inserted a temporary line between 2 of the tanks and everything is now working normally.
I plan to continue with our vacation, and upon returning home i will take to Spartan to have it all
Put back to stock.
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Old 01-24-2022, 02:51 PM   #160
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Happy trails, Rollie. Better days are comin'!
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Old 01-24-2022, 03:04 PM   #161
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Thank you
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Old 01-24-2022, 03:16 PM   #162
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Quote:
Originally Posted by Roland Trombley View Post
The mechanic determined that there is some kind of obstruction in the air tank plumbing up front.
To get us in the road he inserted a temporary line between 2 of the tanks and everything is now working normally.
I plan to continue with our vacation, and upon returning home i will take to Spartan to have it all
Put back to stock.
Great news ! Wish you could have found this mechanic first.
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Old 01-24-2022, 04:42 PM   #163
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Woo-hoo! I knew you'd win!

There's a check valve between the wet (supply) tank and both the primary and secondary tanks.
Since dryer had already gone to lunch, I'll bet the check valve is rusty, trashy stuff stuck in it...

But that's another day.
Please let us know you made it home safely!
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Old 01-24-2022, 04:49 PM   #164
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Thank you for all of your support!
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Old 01-24-2022, 05:28 PM   #165
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Hip hip hooray. Glad youíre back on the road!!
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Old 01-24-2022, 06:29 PM   #166
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Great to hear you are on the road again! Have a super time for the rest of your trip home.

Lots of great people on this forum.
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Old 01-26-2022, 02:32 PM   #167
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Latest update

Drove from north of Atlanta to Valdosta yesterday. Everything worked perfectly. Highway traffic, stop and go traffic. All went perfectly. Pressures moved between 90 and 125 as I drove, based upon brake usage.
Last night when trying to level the coach it was necessary to raise the left front wheel off the ground and I thought nothing of it. This morning I started up to head out to St Petersburg and could not get pressure over 75 pounds.
Been trying it through the day and now it won't go above 45.
Can't find a mobile service near here (Valdosta).
Called the only shop willing to look at it and the guy looked underneath for 5 minutes, no tools or anything, and said I need a new comoressor, so it must be towed 20 miles.
Can't understand how one day it pumps to 125 and the next day it won't, and the next day it will...
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Old 01-26-2022, 02:59 PM   #168
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Roland, I'm no air system expert but I'm with you I wouldn't think it's the compressor. I'm thinking it is likely there is another restriction in an air line or some such thing. In my world 5 minutes is not enough time to properly diagnose any problem like you are having. BTW there used to be a pretty good BBQ restaurant in Valdosta called the Smokin Pig. Good luck.
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