So been working on the rear air suspension of my Electro Level 1 system because i accidently dropped the right side (well i just tried the switch....it dumped the whole bag in a split second) and it wont refill.

I replaced the DANA compressor with a known good one because mine was weak along with a faulty check valve and pressure gauge. Got it all back together and still no lift....right side doesnt build pressure but the left side doesnt.

So i hit "travel mode" to see what would happen....i assumed the bags would balance left/right but nope....right side stayed the same and so did left with no visible pressure increase on gauge.


All solinoids have power and click.....right side raise solenoid (one with blue line) works and allows air when i blow in it....lower solenoid (middle of the three) allows air to flow when i blow in it....the last solinoid works(one with yellow line) but i cant verify air passage because i have remove a bunch of other stuff in the way.....

So heres my thought on this.....one would suspect the bag or line to the bag as having a leak because the gauge never builds pressure (right side or travel mode) but there is zero audible air leakage....which would leave me, you would think with a plugged solinoid but that would build pressure, which it doesnt.

The other question i have is how much air should be coming out of the system at the solinoids? I would think enough that if you plugged the hole with your thumb you'd feel it.....no?

6cuda6 wrote on Mon, 29 July 2019 22:01

So been working on the rear air suspension of my Electro Level 1 system because i accidently dropped the right side (well i just tried the switch....it dumped the whole bag in a split second) and it wont refill.

I replaced the DANA compressor with a known good one because mine was weak along with a faulty check valve and pressure gauge. Got it all back together and still no lift....right side doesnt build pressure but the left side doesnt.

So i hit "travel mode" to see what would happen....i assumed the bags would balance left/right but nope....right side stayed the same and so did left with no visible pressure increase on gauge.


All solinoids have power and click.....right side raise solenoid (one with blue line) works and allows air when i blow in it....lower solenoid (middle of the three) allows air to flow when i blow in it....the last solinoid works(one with yellow line) but i cant verify air passage because i have remove a bunch of other stuff in the way.....

So heres my thought on this.....one would suspect the bag or line to the bag as having a leak because the gauge never builds pressure (right side or travel mode) but there is zero audible air leakage....which would leave me, you would think with a plugged solinoid but that would build pressure, which it doesnt.

The other question i have is how much air should be coming out of the system at the solinoids? I would think enough that if you plugged the hole with your thumb you'd feel it.....no?

Rich,

Yes, if you disconnect the line that goes to an airspring(bag) and that side is switched to "Raise", then there should be significant pressure at that port.
Or, if it is switched to "Travel" and that side is down, then the height control valve should be supplying about that same pressure.

Are these still the OE Airsprings (bags)??
One know issue with the Sully system is the air port of the spring can get blocked when the suspension is flat.

The system is controlled by the ride height control valves in each rear wheel well. Do not expect one side to react to the state of the other.

Matt

Just disconnect the air line at the air bag. Unscrew the fitting that goes
into the air bag. Screw a Schrader valve into the air bag. Inflate to 90
psi. Drive it home. Fix it there.
Jim Hupy

On Tue, Jul 30, 2019, 12:04 PM tonka6cuda6--- via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Matt Colie wrote on Tue, 30 July 2019 08:38
>> 6cuda6 wrote on Mon, 29 July 2019 22:01
>>> So been working on the rear air suspension of my Electro Level 1
> system because i accidently dropped the right side (well i just tried the
>>> switch....it dumped the whole bag in a split second) and it wont
> refill.
>>>
>>> I replaced the DANA compressor with a known good one because mine was
> weak along with a faulty check valve and pressure gauge. Got it all back
>>> together and still no lift....right side doesnt build pressure but the
> left side doesnt.
>>>
>>> So i hit "travel mode" to see what would happen....i assumed the bags
> would balance left/right but nope....right side stayed the same and so
>>> did left with no visible pressure increase on gauge.
>>>
>>>
>>> All solinoids have power and click.....right side raise solenoid (one
> with blue line) works and allows air when i blow in it....lower solenoid
>>> (middle of the three) allows air to flow when i blow in it....the last
> solinoid works(one with yellow line) but i cant verify air passage because
>>> i have remove a bunch of other stuff in the way.....
>>>
>>> So heres my thought on this.....one would suspect the bag or line to
> the bag as having a leak because the gauge never builds pressure (right
>>> side or travel mode) but there is zero audible air leakage....which
> would leave me, you would think with a plugged solinoid but that would build
>>> pressure, which it doesnt.
>>>
>>> The other question i have is how much air should be coming out of the
> system at the solinoids? I would think enough that if you plugged the
>>> hole with your thumb you'd feel it.....no?
>>
>> Rich,
>>
>> Yes, if you disconnect the line that goes to an airspring(bag) and that
> side is switched to "Raise", then there should be significant pressure at
>> that port.
>> Or, if it is switched to "Travel" and that side is down, then the height
> control valve should be supplying about that same pressure.
>>
>> Are these still the OE Airsprings (bags)??
>> One know issue with the Sully system is the air port of the spring can
> get blocked when the suspension is flat.
>>
>> The system is controlled by the ride height control valves in each rear
> wheel well. Do not expect one side to react to the state of the other.
>>
>> Matt
>
> OE style Firestones...which are weathered but appear to be holding air
> well enough to drive the coach back 700 miles from were we bought it.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
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Rich, when the leaks are fixed the system requires verylitte air volume on the road. Once it's pressured, and there's a tank, you should get the ON light only every now and again, and on reasonable flat road not at all. Rendering it leakless can be a challenge. Put shutoffs and Schraders on each side, and you can still use it while you troubleshoot.


--johnny

When the compressor is running does the gauge ever rise at all?
If the answer is no, then suspect:
1. A bad gauge
2. A bad compressor
3. One heck of a leak

If the compressor pressure rises and then leaks down, then
suspect:
1. A bad check valve if installed.
2. A backwards leak through the stopped compressor.
3. A leak in any of the lines between the compressor and the valve / solenoid assembly. (unless you installed those shut of thing and have them turned off.)
4. A bad compressor.
5. Bad air pressure switch or unloader, if equipped.

It has been a while but I believe the compressor line goes to the Check valve then the tank and the tank connects to the manifold. I have no idea where the gauge is connected to since it is not OEM.

You could disconnect the line at the tank and put a plug or better yet a pressure gauge in the hole where you disconnected the line. Then run the compressor see if it will build up pressure and hold it. Run it up to about 120 PSI and shut and manually shut off the compressor. The normal pressure switch will not shut it off because it is on the side that you disconnected. If builds up and holds pressure you know everything up to that point is OK. If it is OK, put it back together and move on to things connected at the manifold. If not, find the problems from the tank to the compressor and fix them.