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Topic: Air Source for the Air Hose Connector? (Read 399 times) previous topic - next topic

Air Source for the Air Hose Connector?

I am trying to confirm the air source for the air hose connector located in the fuel/propane bay.  In the past when I connect an air hose to the connector I had air pressure.  It was not always 90 psi if I hadn't run the engine but I had some pressure.  Currently I am not getting any pressure at the connector.  I've attached the air system schematic but I am having difficulty in trying to interpret the lines and which way the air is actually traveling.  In the air hose source drawing I have drawn some red lines in which I think the air is flowing.  Please let me know if this correct or not.  Thanks in advance.
David & Sherry Kendrick
"Gizmo" The Doggy Lama
USAF(Ret) 1971-75; 1979-95 (20 yrs)
2003 U320 F03 [6179] 38PBDS (3/2016)
2016 Chev Silverado Z71 LTZ
Motorcade 17738
--------------------------------------
New Horizons 5W 25' RKS (1/2004 - 3/2016)
2003 Chev Silverado 2500HD Duramax
Tent (5-person) White Stag (1972 - 2003)

Re: Air Source for the Air Hose Connector?

Reply #1 –
You got it right
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Air Source for the Air Hose Connector?

Reply #2 –
Asking the obvious,is the engine running when you try and get air?
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Air Source for the Air Hose Connector?

Reply #3 –
David,

Note that all the air lines you marked in red (in 2nd expanded image) are downstream of the protection valve on that tank.  The protection valve, if functioning correctly, should cut off air flow to those lines when pressure in the tank gets to approximately 60 psi (or below).  This is the raison d'être for the protection valve - to hold enough air pressure in the tank so you still have a couple brake applications in the event of a catastrophic air system failure.

See post linked below for more details:

Air Tank Valves R&R

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Air Source for the Air Hose Connector?

Reply #4 –
Thanks for the quick and informative answers.  I started noticing the air line hose connector not working as it had in the past after I had Keith Risch work on the air system.  He found the tag air bags connected crosswise among other leaks.  Maybe he readjusted the check valves from vertical to horizontal.  Guess it's time to put on the coveralls and crawl under to have a look.  ;D
David & Sherry Kendrick
"Gizmo" The Doggy Lama
USAF(Ret) 1971-75; 1979-95 (20 yrs)
2003 U320 F03 [6179] 38PBDS (3/2016)
2016 Chev Silverado Z71 LTZ
Motorcade 17738
--------------------------------------
New Horizons 5W 25' RKS (1/2004 - 3/2016)
2003 Chev Silverado 2500HD Duramax
Tent (5-person) White Stag (1972 - 2003)

Re: Air Source for the Air Hose Connector?

Reply #5 –
Quote from: WagonWheels –
Maybe he readjusted the check valves from vertical to horizontal.
Check valves don't care how they are oriented...vertical or horizontal all the same to them.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Air Source for the Air Hose Connector?

Reply #6 –
On our coach I have only found two ways to get pressure on the external air connection.  1) have engine running or, 2) use the Air Tank switch by the driver.
Andy & Sue (and Sofie dog) + Lucy dog
2002 U320 4020
# 5959
TOAD 2014 CRV