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Help-HWH leveling system problem

Yahoo Message Number: 6524
When I first pull up and operate the leveling system with the engine running, the coach levels perfectly. However, after several days, it loses its level. As I understand it, the air pump is supposed to come on at 105 psi and off at 115 psi. However, it seems to be erratic in operation, sometimes coming on, sometimes not. After several days, the pressure (assuming the red needle on the air pressure guage monitors the leveling system) is down to 50 psi.

The pressure measured by the white needle is also down to 50 psi by that time.

Questions:

There are two needles on my air pressure guage. One red, one white. Is the red needle on the air pressure guage the pressure for the HWH system? And should this always be between 105 and 115 psi?

How often should the air pump come on when you are parked and the leveling system is on? How long does it typically run? How fast does it built the pressure back up?

Where is the level sensor unit installed? It appears this needs some adjusting as even when the system says the coach is level, it is low on the driver's side.

Thanks for your help.

Dan & Ann

1998 Allure #30180

Re: Help-HWH leveling system problem

Reply #1 –
Yahoo Message Number: 6531
Dan,

Unless there was something different in 98, the white and red needles are for the brake tanks only. One is for the rear and one is for the front. The HWH should be working off the aux tank, in my case, the aux and wet tank are the same. When your still running, the aux tank is probably up to pressure, 90 -120 and makes the suspension work real easy. After you shut down and the system calls for air over the few days, the aux tank is depleted and the 12V compressor is trying to do all the work. It sounds like you have a leak somewhere in the system that includes the two brake tanks as well as the aux tank. I can go several months with little leak down on the brake tanks, but the aux will lose air keeping the suspension level. I plumbed in a gauge for the aux tank so I know whats going on at all times. I also added a second aux tank to get the added air volume.

I would start by checking every fitting from the engine compressor all the way to the front with soapy water. If no visable leaks, it may be internal. There are several check valves that if faulty, can allow your brake air to leak back to the aux tank, or from the aux tank back through your dryer and from the dryer back to the engine compressor and you wont be able to hear it.

Hope some of this helps, as I have been there...
Tom

02 Allure 30780

Re: Help-HWH leveling system problem

Reply #2 –
Yahoo Message Number: 6534
Thanks, Tom, that's very helpful indeed. I didn't quite understand the tank situation. Are you saying there are three tanks, two for the brakes and one for aux? What is the "wet" tank?

Dan

98 Allure 30180

Quote from: truk4u2003

Dan,

Unless there was something different in 98, the white and red

needles

Quote
are for the brake tanks only. One is for the rear and one is for

the

Quote
front. The HWH should be working off the aux tank, in my case, the > aux and wet tank are the same. When your still running, the aux

tank

Quote
is probably up to pressure, 90 -120 and makes the suspension work > real easy. After you shut down and the system calls for air over

the

Quote
few days, the aux tank is depleted and the 12V compressor is

trying

Quote
to do all the work. It sounds like you have a leak somewhere in the > system that includes the two brake tanks as well as the aux tank. I > can go several months with little leak down on the brake tanks, but > the aux will lose air keeping the suspension level. I plumbed in a > gauge for the aux tank so I know whats going on at all times. I

also

Re: Help-HWH leveling system problem

Reply #3 –
Yahoo Message Number: 6535
Dan,

I'm not sure about your set up, but mine has two tanks and they are partitioned internally. Normally, the wet tank is the one that gets the air first from the dryer, then to the aux and on to the brake tanks. I've come to the conclusion that our tanks really don't have a wet tank, it's just the aux. My Foretravel had a seperate large tank for the wet tank. All the wet tank did was allow you to drain off any water before it got to the brake tanks. It had a drain valve out near the bay door so you could easily drain it. I have never got any water out of any of these tanks, as the dryer pretty much does it's job unless your parked in really hot/cold temps for a long period of time.

My particular Foretravel had the HWH working off the brake tanks, so you could see the air usage while watching the dash gauges. It was a much better setup, since the tanks were big enough to allow the suspension to use air without the need for the 12V pump to run.
It's all about volume... It also did not have quick response level valves like my CC and didn't use air constantly while driving. Thats why the CC's like mine cycle the compressor about every 45 seconds (dryer pops off) while driving because the suspension is using lots of air from the whimpy aux tank that can't keep up. You wouldn't believe the amount of air the suspension uses while driving, at times I have seen a 10 lb. deflection on the gauge. In addition, until I added a larger aux tank, my raise function would not lift the rear of the Coach more than 1 inch.

Sorry, I got off the subject a little, but for about 200.00, CC could install a large aux tank and solve most of these problems.
I suggested that to them by the way...

Tom

02 Allure 30780
 

Re: Help-HWH leveling system problem

Reply #4 –
Yahoo Message Number: 6536
Thanks, Tom, yes it looks like the tank monitored by the red needle is being used by the leveling system. Mine doesn't have any problem moving the coach and leveling it quickly so long as the engine is running. My problem shows up after several days when the air pressure is apparently falling too low.

Dan

98 Allure #30180

Quote from: truk4u2003

Dan,

I'm not sure about your set up, but mine has two tanks and they > are partitioned internally. Normally, the wet tank is the one that > gets the air first from the dryer, then to the aux and on to the > brake tanks. I've come to the conclusion that our tanks really

don't

Quote
have a wet tank, it's just the aux. My Foretravel had a seperate > large tank for the wet tank. All the wet tank did was allow you to > drain off any water before it got to the brake tanks. It had a > drain valve out near the bay door so you could easily drain it. I > have never got any water out of any of these tanks, as the dryer > pretty much does it's job unless your parked in really hot/cold > temps for a long period of time.

My particular Foretravel had the HWH working off the brake tanks, > so you could see the air usage while watching the dash gauges. It > was a much better setup, since the tanks were big enough to allow > the suspension to use air without the need for the 12V pump to run.
It's all about volume... It also did not have quick response level > valves like my CC and didn't use air constantly while driving.

Thats

Quote
why the CC's like mine cycle the compressor about every 45 seconds > (dryer pops off) while driving because the suspension is using

lots