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Dry air tanks question

I've had an intermittent problem with the coach leaning to the drivers side after a day or 2. I've used my contractor air compressor to refill air tanks to re-level coach. Since I don't have an air drier I empty the wet and dry tanks when done to get as much of the wet air out. This morning I only opened the drivers side dry tank only to see which needle (orange or white) on my air pressure gauge moved. After all air was out I checked my gauge and both needles were at 0. I then opened the air release on the passenger side dry tank and it was empty. Is this normal? I assumed the 2 tanks would be isolated from each other.

Don't have an air schematic to check. :( Tried search but couldn't come up with the magic words to get a meaningful hit. :(

Would really appreciate an air schematic for a 90's no slide if any one out there has one.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Dry air tanks question

Reply #1 –
Is it just the 40 footers that have that lash-up? Hang in there Ken!
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
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Re: Dry air tanks question

Reply #2 –
Quote from: kenhat –
1. Is this normal?
2. I assumed the 2 tanks would be isolated from each other.

Ken,
1. No
2. You should have a check valve on the inlet to each tank that separates one from the other. (front air from rear)
Sounds like you need to pull the check valves and either clean them or replace them as a start.

Pamela & Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Dry air tanks question

Reply #3 –
Thanks Pamela & Mike,

I do suspect the check valves. Will start there.

I did do 2 more experiments. I filled the tanks then opened the wet tank valve. After all air was exhausted I checked the air gauge and both needles still showed 120. So looks like that check valve is working. I then opened the passenger side valve and only the orange needle dropped.

Looks like I'll need to do some sleuthing to find the misbehaving check valve.

see ya
ken 
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: Dry air tanks question

Reply #4 –
Ken,

Those check valves should be # KN-23000 if you decide to replace one or all.

Pamela & Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Dry air tanks question

Reply #5 –
Ken I have the schematic not.sure how to get it to you. Call me 406 852 3776.We are in camp Verde az.
Andy & Eileen
MONTROSE COLORADO
1992 U300  40' 6V92 TA
2016 4 Runner
1998 Jeep Grand cherokee

1998 Jeep Grand Cherokee) Build # 4135 Skp# 122921

Re: Dry air tanks question

Reply #6 –
Ken, those check valves cause many problems if old or original. You can take apart and clean but as they are only around $10 I would buy new. Careful installing them as the threaded part were they come apart can get distorted if using wrong wrenches. Heat the thread ed tank part and it will make it easier to unscrew.
Maybe dumb question but why do you not have a dryer ???
JohnH
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.

Re: Dry air tanks question

Reply #7 –
Ken here ya go I think lol
Andy & Eileen
MONTROSE COLORADO
1992 U300  40' 6V92 TA
2016 4 Runner
1998 Jeep Grand cherokee

1998 Jeep Grand Cherokee) Build # 4135 Skp# 122921

Re: Dry air tanks question

Reply #8 –
Quote
@john Maybe dumb question but why do you not have a dryer ???

I have a dryer on my coach but not on my cheapie shop compressor.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X
 

Re: Dry air tanks question

Reply #9 –
Quote from: Andy 2 –
Ken here ya go I think lol

Thanks Andy! That helps a LOT. Studying it now.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X