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Old 07-30-2018, 05:02 PM   #1
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04 Beaver Magnum chassis I'm on the road need advise

Over 1000 miles on this journey into the trip while watching the air gauges they started acting weird. The Red stayed at pressure the Green would drop to the point of the compressor kicking on, bring them both to max air they would both settle in at the normal level and stay there for a bit. Then the Green would drop a touch to like 101 stay there for a few minutes then go to around 98/99 stay for a bit then drop rapidly until the compressor kicked on. It would repeat this over and over but then stop doing it for 5 minutes or so and start all over again.

When we got the camp ground it has sat for 24 hours ow the green did not drop one pound the red dropped about 20 which is typical. I called a local garage they said to chalk the wheels bring the air up shut the coach off and take the ebrake off to see if it drops, it did not.

Any ideas? My mechanic at home over the phone is thinking maybe the air regulator on the pump. Another mechanic over the phone thinks air line leak. I do not think that is it or they would leak all the time. If I hold the brake pedal down it goes down about 7 lbs on the initial press but does not lose one lb of air. I am thinking has to be regulator or something in the compressor itself.

Thoughts?
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Old 07-30-2018, 05:28 PM   #2
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Not the regulator ( governor ). The governor gets its signal from the wet tank.

The wet tank, which is the firsttank filled by the compressor, has no gauge. It is isolated with check valves to block backfeed from either gauged tank.

If it only drops while traveling, it could very well be a suspension leak.
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Old 07-30-2018, 09:26 PM   #3
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Quote:
Originally Posted by twinboat View Post
Not the regulator ( governor ). The governor gets its signal from the wet tank.

The wet tank, which is the firsttank filled by the compressor, has no gauge. It is isolated with check valves to block backfeed from either gauged tank.

If it only drops while traveling, it could very well be a suspension leak.
I should say t only does it when started whether moving or not. Turn the engine off and the air holds no issues. The only reason I am leaning against suspension is it does not lose any air when sitting. If it was suspension it would lose it all the time.

I am at a truck shop in Troy IL. Suppose to be looking at it in the morning hopefully they can find it and we can be on our way.

It's a head scratcher for sure.
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Old 08-01-2018, 07:14 AM   #4
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If it only happens while driving it might have something to do with the ride height valve(s), possibly sticking letting air release. Just a SWAG
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Old 08-01-2018, 04:25 PM   #5
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The governor is not that expensive. Should be able to pick one up at NAPA for around 30 or 40 bucks.
I would try that first. If not might be the air dryer.
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Old 08-01-2018, 09:50 PM   #6
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Thanks for the reply's. After talking to a few good friends that run trucks for a living all though they do not know what is causing it (I think your suggestions will be the starting point) they all said run it and watch the air. If it drops below 70 pull over and find a shop other then that run it. So we put on 480 miles today doing the same thing but never lower than 90 lbs so looks like I am going to run it home.

My "hunch" is it's the governor as suggested it could be the ride height that is a definite possibility or the compressor has check valves of a sort that might be a possibility. If the cost for a new compressor is reasonable I am just going to put a new one in and a new regulator as well. And no matter what going to have the air dryer serviced.


Thanks for the help.
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Old 08-12-2018, 06:18 PM   #7
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Mine dropped drastically two years ago. I discovered the supply fitting to the leveling valves is just a press fit and it had popped loose when I went over a bump, causing the air bags on the right to be deflated and there to be no air pressure at idle or low revs. I used a pair of vice grips to clamp it back in and the dealer told me that is how they repair it too!
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Old 08-13-2018, 01:26 PM   #8
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Mine dropped drastically two years ago. I discovered the supply fitting to the leveling valves is just a press fit and it had popped loose when I went over a bump, causing the air bags on the right to be deflated and there to be no air pressure at idle or low revs. I used a pair of vice grips to clamp it back in and the dealer told me that is how they repair it too!
Thanks for the reply. This one is not losing air fast and it only does it when running so pretty sure not a leak of that sort.

It is at the shop now they have been crazy busy and I was in no hurry for it so hopefully we will know something soon. I searched the internet for hours and can not find a single incident of anyone reporting anything like this happening which in itself these days is odd.

My hunch is it is in the air governor. I watched a youtube video if a cut away of one. The way they work it is plausible the spring could be weak of o-ring dried up. There is an escape port for the air under certain conditions that seems it would be where we could be losing the air.
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Old 08-23-2018, 02:18 PM   #9
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Just an update for those that are following this thread.

The shop I have it at found a very small air leak in one of the lines from the compressor to the air governor. Replaced it, still doing it. While there for the low cost of a governor I had them replace it, still doing it. I was going to have them rebuild the air dryer but really wanted to eliminate any issue with it so, replaced it, still nothing. Along the way they also replaced a couple of the pop-off's which did not help either.

So really running out things it can be. My hunch now is something in the compressor. The odd thing is it only does it when running. The obvious item would be the suspension but if it was it would lose air when sitting over night also. It isn't losing any. And there are no air leaks they can find.

This one has us stumped. It can be driven like this but my fear is whatever this is could cause an issue far from home at the worst time and I just do not want to deal with that.
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Old 08-23-2018, 11:32 PM   #10
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What items consume air or are supplied with air whilst on the road ? I assume the shops troubleshooting is in the shop. Is there any air consumption/air supply controlled by the transmission? I assume the loss does not happen with the engine running but in the park position?
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Old 08-24-2018, 08:01 AM   #11
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How can the problem be the air compressor or governor or dryer, if the air only leaks on the green side (secondary side)? Those items above would affect both sides (red and green). You would need to have a leaking check valve at the secondary air tank too (which is possible).

Do you have the HWH air leveling system? Perhaps with "key on" (HWH active) you are losing air from the front HWH manifold travel solenoid or connecting ride height valve for front axle.

Do you have a front door air seal? Those only get air pressure when key is on and transmission is in gear - so could be hard to find in shop with tranny in nuetral.
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Old 08-25-2018, 06:03 PM   #12
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Quote:
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What items consume air or are supplied with air whilst on the road ? I assume the shops troubleshooting is in the shop. Is there any air consumption/air supply controlled by the transmission? I assume the loss does not happen with the engine running but in the park position?
It has an Allison so no air to the trans. They are trouble shooting in the shop then road testing. Thanks
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Old 08-25-2018, 06:06 PM   #13
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How can the problem be the air compressor or governor or dryer, if the air only leaks on the green side (secondary side)? Those items above would affect both sides (red and green). You would need to have a leaking check valve at the secondary air tank too (which is possible).

Do you have the HWH air leveling system? Perhaps with "key on" (HWH active) you are losing air from the front HWH manifold travel solenoid or connecting ride height valve for front axle.

Do you have a front door air seal? Those only get air pressure when key is on and transmission is in gear - so could be hard to find in shop with tranny in nuetral.
I was wrong on the green being secondary it is primary. I believe they checked all the check vales but will ask to make sure.

I do have the HWH air system but not sure they checked the manifold or not. I will ask this as well. Thanks
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Old 09-06-2018, 06:33 AM   #14
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Have you checked the connections behind your air gauges? Although with that kind of loss it would be relatively easy to hear?

Mine was leaking from the primary air gauge connection from where the brass DOT quick connect fitting was attached to the gauge housing when manufactured.
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