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11-06-2019, 07:37 AM
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#1
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Junior Member
Join Date: Nov 2019
Posts: 4
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Strange Air Leak 2006 Monaco Knight rr8r
I have a 2006 Knight that looses all air on the gauge in 24 hours and yet the coach does not drop. On my last trip the coach suspension dropped to the ground while getting fuel and then aired up again after 5 minutes or so. I suspect a problem with the leveling valve but really do not know. I am also unsure if I should be draining water from air system. I bought this new in 07 and it has been a great coach. 70k miles on it and this is the first problem I have been unable to solve. Any help/ideas are appreciated.
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11-06-2019, 10:23 AM
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#2
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,751
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Welcome to the forum  !
Yes, you should be pulling the drains on your air tanks regularly.
Have you ever had your air dryer dessicant filter replaced?
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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11-06-2019, 02:06 PM
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#3
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Senior Member
Join Date: Oct 2013
Posts: 387
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Definitely need to drain the tanks and replace the dessicant filter regularly.
I have never had mine drop quickly but will loose all the air in 6 hours and drop the rear bags if parked on an unlevel spot.
Was the coach at an extreme angle when it lost air?
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2005 Monaco Knight 40PLQ
2013 Ford Edge
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11-06-2019, 02:12 PM
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#4
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Senior Member
Holiday Rambler Owners Club
Join Date: Feb 2017
Location: Oregon
Posts: 100
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How do you drain your air tanks of water I have an 08 Holiday Rambler endeavor
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08 Holiday Rambler endeavor skq 400 Cummins
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11-06-2019, 02:35 PM
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#5
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Senior Member
Join Date: Jun 2017
Location: Bryan Tx
Posts: 1,023
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You should drain the tanks at least once a month. When you say the suspension drop did the tanks go to zero or did the air bags drop and tanks stay at about 60 psi?
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“06” Beaver Patriot Thunder , 525 HP C13 Cat
MH 4000 Allison
42 ft Vicksburg, 4 slides
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11-06-2019, 02:39 PM
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#6
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,751
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All of my tank drains are on a manifold on the drivers side in the generator compartment. Don't know if the Endeavour / Diplomat is in the same place, or whether they used lanyards in one of the wheelwells.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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11-06-2019, 03:46 PM
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#7
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Senior Member
Join Date: Jun 2017
Location: Bryan Tx
Posts: 1,023
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Just reread your post. Yours should be a lot like my 06 Beaver. The suspension is isolated from the main tanks by a check valve in the HWH manifolds. That is why the tanks can drop to 0 without dropping the suspension not sure why the suspension dropped during refueling. Did you hear an aux air compressor cycle on? It feeds the suspension system directly without feeding the tanks. At least that is how my HWH system works
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“06” Beaver Patriot Thunder , 525 HP C13 Cat
MH 4000 Allison
42 ft Vicksburg, 4 slides
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11-06-2019, 04:50 PM
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#8
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,751
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Well, if the air system isn't maintained, it can wreak havoc with the suspenssion system / leveling system check valves!
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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11-07-2019, 12:50 AM
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#9
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Senior Member
Join Date: Jan 2018
Posts: 3,009
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There are three tank drain valves on my 2005 Monaco Knight. Two are mounted just in front of the Onan generator on the curbside. The third valve is mounted on the hitch receiver structure near the center on the curbside. The valve handles should be turned 90° and left open up to 5 minutes after the air has all emptied from the tanks. If you are in a humid climate you should drain the tanks more frequently than if you are located in a dry climate. Perhaps weekly versus monthly.
The dessicant air cartridge is located in the compartment just behind the roadside drive tires which is accessed using the barrel key.
My coach does not have an HWH air leveling system. It has an RVA 3 jack hydraulic levelling system.
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2005 Monaco Knight 40PLQ; Cummins 8.3L ISC330, Pacbrake, Allison 3000, Roadmaster RR8R, ScanGauge D, 2004 Kawasaki Vulcan VN750(Geezer Glide) on a Versahaul carrier pulling a 2013 Kia Soul+; 2.0L, 6 speed Sport shifter(great car) on an American Car Dolly(great dolly.)
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11-07-2019, 06:38 AM
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#10
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Junior Member
Join Date: Nov 2019
Posts: 4
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Thanks for the great information. This is something that I have clearly missed. I was under the impression that the water dumped itself but appears to be a misconception on my part. I will look for these drains and for the desiccant filter. Thank you very much!
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11-07-2019, 06:41 AM
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#11
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Junior Member
Join Date: Nov 2019
Posts: 4
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I don't have an HWH system but your description is accurate. What is different is that in the past the suspension always dropped as the air pressure dropped. Now the tanks have no/little pressure and the suspension is still inflated. I think I have a bad valve somewhere probably water related due to the lack of maintenance/knowledge on my part. Thanks for your help.
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11-07-2019, 06:42 AM
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#12
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Junior Member
Join Date: Nov 2019
Posts: 4
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You are correct and I am afraid that is a big part of what has gone wrong here......
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11-08-2019, 10:12 AM
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#13
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,751
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Quote:
Originally Posted by mb mark
I don't have an HWH system but your description is accurate. What is different is that in the past the suspension always dropped as the air pressure dropped. Now the tanks have no/little pressure and the suspension is still inflated.
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Seems to me that it has somehow started working as designed !
My air tanks will bleed down over several days, but my susspension never does!
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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11-09-2019, 04:43 PM
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#14
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Senior Member
Join Date: Jun 2017
Location: Bryan Tx
Posts: 1,023
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Hey that’s half the system trouble shooting done  leaves you with the brakes,tanks,and air drier.
__________________
“06” Beaver Patriot Thunder , 525 HP C13 Cat
MH 4000 Allison
42 ft Vicksburg, 4 slides
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