Home » Public Forums » GMCnet » autolevel
| autolevel [message #207576] |
Mon, 13 May 2013 12:45  |
appie
Messages: 902
Registered: April 2013
Location: denmark
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I know this must have been up a thousand times:
Olga has these fine quadrabags, but they can't find a riding hight.
When I set the system at "auto" she goes al the way up.
I tried to set it at a certain level, loosen the adjustment nuts, find the free play and tighten them again, without any difference.
There must be lot of you guys that have worked on this ?
Appie
'eleganza 76
Denmark
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] autolevel [message #207585 is a reply to message #207581] |
Mon, 13 May 2013 13:50  |
appie
Messages: 902
Registered: April 2013
Location: denmark
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Is there any way to check the valves and solenoids? Would like to be sure they are a problem before buying new?
Appie
eleganza 76
Denmark
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] autolevel [message #207586 is a reply to message #207585] |
Mon, 13 May 2013 13:59 |
appie
Messages: 902
Registered: April 2013
Location: denmark
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Reading the pdf you linked to makes things abit clearer. will take this out to olga tomorrow
Thanks
appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: autolevel [message #207602 is a reply to message #207576] |
Mon, 13 May 2013 15:42 |
appie
Messages: 902
Registered: April 2013
Location: denmark
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Fransois do you then have any way to determain correct driving height ?
Appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] autolevel [message #207614 is a reply to message #207576] |
Mon, 13 May 2013 18:00 |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
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James Hupy has a system built and ready to ship to you - contact him with
your order.
Dwayne Jacobson
77 Kingsley
White Rock
On Mon, May 13, 2013 at 10:45 AM, lenze middelberg <lenze@middelberg.dk>wrote:
>
>
> I know this must have been up a thousand times:
>
> Olga has these fine quadrabags, but they can't find a riding hight.
> When I set the system at "auto" she goes al the way up.
> I tried to set it at a certain level, loosen the adjustment nuts, find the
> free play and tighten them again, without any difference.
>
> There must be lot of you guys that have worked on this ?
>
> Appie
> 'eleganza 76
> Denmark
> _______________________________________________
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--
Dwayne Jacobson
Haven Properties
Ph: 604-538-3823 Ext 22
Fax: 604-538-5845
Cell: 604-644-8090
dwayne@havenproperties.ca
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Dwayne & Sharon Jacobson
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77 Eleganza II
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| Re: [GMCnet] autolevel [message #207641 is a reply to message #207576] |
Mon, 13 May 2013 23:29 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Appie,
First of all I need to know which suspension control system you have:
1) PowerLevel - two valves in the middle of the dashboard
2) Electrolevel I - three switches on the driver's side and "mechanical" ride height valves in the wheel wells
3) Electrolevel II - three switches on the driver's side and "electric" ride height valves in the wheel wells.
Once I have that information I will make some suggestions.
Regards,
Rob M.
-----Original Message-----
From: lenze middelberg
I know this must have been up a thousand times:
Olga has these fine quadrabags, but they can't find a riding hight.
When I set the system at "auto" she goes al the way up.
I tried to set it at a certain level, loosen the adjustment nuts, find the free play and tighten them again, without any difference.
There must be lot of you guys that have worked on this ?
Appie
'eleganza 76
Denmark
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: autolevel [message #207642 is a reply to message #207576] |
Tue, 14 May 2013 00:00 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Appie,
I waited a day to see what other would post first.
Here is my opinion on how I would start to resolve your problem(s).
First let me state that reading air pressure does NOT indicate that the coach is at correct ride height. At correct height the air bag pressures are seldom identical. This is due to the coach weight variance from side to side.
A few years back we weighed coaches attending several rallies. We probably weighed 75 total coaches. The weight differences side to side in the rear were all over the place.
Establishing he correct rear height is very import as it also affects the weight distribution on the front torsion bars and front ride heights.
If I understand your problem correctly you can not get the air bags to settle at the correct height in automatic mode. It appears to me that your problem is one of two two things.
1. It is electrical and in auto mode you are actually in raise mode over riding the height control air switches.
2. The ride control air switches (located in the wheels) are way out of adjustment or broken.
I think I would go about chasing this problem by doing the following:
1. Air up the bags manually until the coach is at the correct height.
2. Disconnect the rod between the air control switch and the suspension arm. The control switch has a detent and should sit in the middle (detented) position with the rods disconnected.
3. Start the coach and make sure that the coach stays at correct level.
4. With the coach still running move the inside middle control switch to the "auto" mode. The airbag position should not change. If it stays stable, then adjust the switches so they stay at the detented position and you and can hook up the rods again. You should be close to the correct adjustment. Some minor adjustments may be needed to get the heights exactly correct.
4a. If the bags do start to inflate, then we have a control problem not associated with the switch positions. I would then return the air bags to the correct ride height, adjust the switches as stated in item 4 above and reinstall the pull/push rods.
Get it that far and if necessary I'll go over the diagrams to figure your next step.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] autolevel [message #207644 is a reply to message #207641] |
Tue, 14 May 2013 00:46 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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It is electrolevel 1
appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: autolevel [message #207645 is a reply to message #207642] |
Tue, 14 May 2013 00:50 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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THANKS Ken
That was very concrete. I'll keep you posted
Appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: autolevel [message #207648 is a reply to message #207576] |
Tue, 14 May 2013 03:20 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Francois
I find it difficult to see the wisdom in this
You have the GMC with a quite advanced suspension system and you disregard it as not important. To my it sounds like: oh the abs on my volvo does not work, well you dont need that anyway.
When I first took Olga for a testride she puled to the left quite badly becourse she was much higher on the right.
May be an interesting ting for a meet: testriding with differnte righthight and offbalances going slalom and braketest. that might give a more detailed picture
Appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] autolevel [message #207654 is a reply to message #207647] |
Tue, 14 May 2013 06:53 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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The adjustible air ride system really is a great aid in driving, unfortunately many people don't recognize and just pump it up and shut it off. It's a "last 10%" of bringing the drivability to it's maximum level. If you have it working and use it you know. Dropping the tail will increase your "steer ahead" control. It really works and in town, it's noce to not have to size up every obsticle in the road as to wether you will bottom out or not plus jacking the rear up allows for a tighter turning radius. If your air ride system works, try it.
Of course you can always just forget about it but part of the reason to own a GMC is it's superior ride. Get the system working, you'll be glad you did...
Jim Bounds
-------------------------------
________________________________
From: Sigmund Frankenfelter <ziggy.frankenf@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, May 14, 2013 3:22 AM
Subject: Re: [GMCnet] autolevel
If I can informally sample the coaches out there, maybe forty percent use either schrader valves alone, or the bag isolators.
Having tried all three approaches, and having listened to people who have also, I don't believe perfection in automatic leveling is as important as others do.
Sure, you can speculate about the effect on torsion bars and other components, but if GM engineered the torsion bars to fail because of momentary differences in ride height, then these coaches aren't so deserving of praise.
The vehicles drive nicely when the l and r rear suspensions are within tolerances of each other. I do not believe those tolerances are as close as some others say
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| Re: [GMCnet] autolevel [message #207661 is a reply to message #207654] |
Tue, 14 May 2013 07:25 |
appie
Messages: 902
Registered: April 2013
Location: denmark
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Please correct me if I am wrong
Today I took of the connection arms. In my understanding it should be like this:
System in auto. If I raise the valve it should take in air and if I lower the valve it should let air out. I understand there is a delay of a few secconds.
Neither valve lets out air ( lowers) when I pull it down.
Also both go on raising with the valves in the detend position
both sides react on the raise and down switches
Appie
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] autolevel [message #207678 is a reply to message #207654] |
Tue, 14 May 2013 10:08 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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| Jim Bounds wrote on Tue, 14 May 2013 04:53 |
The adjustible air ride system really is a great aid in driving, unfortunately many people don't recognize and just pump it up and shut it off. It's a "last 10%" of bringing the drivability to it's maximum level. If you have it working and use it you know. Dropping the tail will increase your "steer ahead" control. It really works and in town, it's noce to not have to size up every obsticle in the road as to wether you will bottom out or not plus jacking the rear up allows for a tighter turning radius. If your air ride system works, try it.
Of course you can always just forget about it but part of the reason to own a GMC is it's superior ride. Get the system working, you'll be glad you did...
Jim Bounds
-------------------------------
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I absolutely agree with Jim on this. I put a lot of effort (and $$) into getting my Power Level system up to snuff and it works great. Without it, I would be constantly worried about dragging the rear end over curbs or through dips (like I did when I first got the coach).
I also agree that, at least in my case, the coach is not as sensitive to ride height issues as some people say. I have driven my coach in "full raise", for extended periods, on the highway, (because I forgot to put it back into "travel") without noticing the difference. I mentioned this to a fellow GMCer that we ran across on our recent trip to San Antonio, and he said maybe it was because I have an adequate amount of caster in my front end (3 degrees), and it didn't need the additional amount that came from lowering the rear suspension to "ride height".
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] autolevel [message #207683 is a reply to message #207678] |
Tue, 14 May 2013 10:40 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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If your steering feels good up, yea it means you do have enough caster even up. Generally speaking, it's difficult to get 2+ deg. of caster even at ride height much less when you raise the rear. You could be goo-- you must be if it drives well that way. Maybe these coaches all look alike but never forget they are hand build "production" vehicles, like a box of chocolotes you never know what you will get"!
Jim Bounds
------------------
________________________________
From: Carl Stouffer <carljr3b@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, May 14, 2013 11:08 AM
Subject: Re: [GMCnet] autolevel
Jim Bounds wrote on Tue, 14 May 2013 04:53
> The adjustible air ride system really is a great aid in driving, unfortunately many people don't recognize and just pump it up and shut it off. It's a "last 10%" of bringing the drivability to it's maximum level. If you have it working and use it you know. Dropping the tail will increase your "steer ahead" control. It really works and in town, it's noce to not have to size up every obsticle in the road as to wether you will bottom out or not plus jacking the rear up allows for a tighter turning radius. If your air ride system works, try it.
>
> Of course you can always just forget about it but part of the reason to own a GMC is it's superior ride. Get the system working, you'll be glad you did...
>
> Jim Bounds
> -------------------------------
I absolutely agree with Jim on this. I put a lot of effort (and $$) into getting my Power Level system up to snuff and it works great. Without it, I would be constantly worried about dragging the rear end over curbs or through dips (like I did when I first got the coach).
I also agree that, at least in my case, the coach is not as sensitive to ride height issues as some people say. I have driven my coach in "full raise", for extended periods, on the highway, (because I forgot to put it back into "travel") without noticing the difference. I mentioned this to a fellow GMCer that we ran across on our recent trip to San Antonio, and he said maybe it was because I have an adequate amount of caster in my front end (3 degrees), and it didn't need the additional amount that came from lowering the rear suspension to "ride height".
--
Carl S.
'75 ex Palm Beach
Tucson, AZ.
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