Home » Public Forums » GMCnet » Pressure in bags when parked...
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| Pressure in bags when parked... [message #211636] |
Wed, 19 June 2013 19:13  |
amdgmcman
Messages: 76
Registered: April 2007
Location: Long Beach, CA
Karma: 0
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Greetings,
I see a lot written about ride height, but is it bad to leave the bags deflated when sitting for a while the coach is stored?
My 78 Royale has the gen 2 set up if that matters. 
Thanks
AMDGMCMan
Alan M DeLuccio
78 Royale with
Coachmen,Center Kitchen Floorplan
09 Harley Davidson Street Glide
65 Corvair Monza Convertible
96 RAV4 2 door Manual 4WD
Long Beach, CA
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| Re: [GMCnet] Pressure in bags when parked... [message #211638 is a reply to message #211636] |
Wed, 19 June 2013 19:33  |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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it is a good idea to sit the gmc on blocks when parked
http://www.gmcmhphotos.com/photos/jacking-up-the-gmc-hooks-ramps-n-stuff/p5273.html
if not, some times the bags will take a set called "hodog"
http://gmcmotorhome.info/rear.html#BAGS
gene
On Wed, Jun 19, 2013 at 5:13 PM, Alan M DeLuccio <delbassman@yahoo.com>wrote:
>
>
> Greetings,
>
> I see a lot written about ride height, but is it bad to leave the bags
> deflated when sitting for a while the coach is stored?
>
> My 78 Royale has the gen 2 set up if that matters. :?
>
> Thanks
>
>
>
> --
> AMDGMCMan
> Alan M DeLuccio
> 78 Royale with
> Coachmen,Center Kitchen Floorplan
> 09 Harley Davidson Street Glide
> 65 Corvair Monza Convertible
> 96 RAV4 2 door Manual 4WD
> Long Beach, CA
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Pressure in bags when parked... [message #211640 is a reply to message #211636] |
Wed, 19 June 2013 19:38 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I think prefered method is wood blocks under the bogie to frame areas and then lower to relieve most pressure. Better for tires as well. That said most naturally deflate over winter and sit low till refilled. Making blocks is on the to do list.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Pressure in bags when parked... [message #211645 is a reply to message #211636] |
Wed, 19 June 2013 22:03 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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My coach has a set of rollers under the rear (to prevent scraping the frame). They do touch down a bit more than I'd like (a LOT more than the frame would!) but they also provide a really easy place to block up the coach. Whether I'm parking it for storage, or at a campsite for more than a few hours, I'll just get the coach level but a little butt-high, and slide some wood blocks under it, then let out enough air pressure to get the rollers firmly on the wood. That just makes the coach feel a lot more solid and a lot less like a vehicle (since it doesn't "bob" when someone's walking around inside).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: Pressure in bags when parked... [message #211652 is a reply to message #211636] |
Wed, 19 June 2013 23:30 |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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So I looked to see about dimensions for blocks under the center support between the rear wheels, but couldn't find anything? Anyone have a good solution with a materials list?
Thanks,
Steve
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: Pressure in bags when parked... [message #211653 is a reply to message #211652] |
Thu, 20 June 2013 05:33 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| quadracerx1 wrote on Wed, 19 June 2013 21:30 |
So I looked to see about dimensions for blocks under the center support between the rear wheels, but couldn't find anything? Anyone have a good solution with a materials list?
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Steve,
If just storing the coach, I use a 4x4 and a 2x4 under each boogie support. That puts the rear a bit low to help any water to drain from the roof.
If I need to keep the coach level for the propane refer and/or actual use, I use an extra 2x4. (Making it (1) 4x4 and (2) 2x4's per side.) Note that the front of this coach is set slightly lower than most, so you might need a little more to get your coach get truly level.
Also, the size of the blocks you need will vary with the parking location. (How level and flat it is.)
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Pressure in bags when parked... [message #211667 is a reply to message #211652] |
Thu, 20 June 2013 08:39 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| quadracerx1 wrote on Wed, 19 June 2013 23:30 |
So I looked to see about dimensions for blocks under the center support between the rear wheels, but couldn't find anything? Anyone have a good solution with a materials list?
Thanks,
Steve
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Steve,
I went to the local Lowes and bought an 8ft length of treated 6x6. The first cut is free and they charge 25 cents per cut after -- so for an additional 50 cents I had four 2 ft lenghs of 6x6.
When parked I may put one under the bogie -- or sometimes I raise the airbag to full height and place two under the frame where it is doubled and then lower the coach -- there is about 1/4 inch. At this height I have had room to pull wheels, work on shocks, change the black tank -- lots of different projects.
Here is a photo showing the double height 6x6's under the frame.
http://www.gmcmhphotos.com/photos/macerator-for-73-23-ft-coach/p38775-0118.html
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Thu, 20 June 2013 08:43] Report message to a moderator |
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| Re: [GMCnet] Pressure in bags when parked... [message #211672 is a reply to message #211668] |
Thu, 20 June 2013 08:54 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Keith,
I've been staying at the storage facility where JohnS and I keep our GMC's. Reception on my Verizon USB modem is poor so I bought a
remote antenna and put it on top of the building - MUCH BETTER!
Last Sunday when I went to dump and refill with water I pulled out and was driving down between the buildings when I heard someone
call out - HEY YOU'RE DRAGGING SOMETHING!
The remote antenna!
Fortunately it still works but now there's a Post It Note on the steering wheel "ANTENNA STUPID!"
Regards,
Rob
-----Original Message-----
From: Keith V
I use a 4x4 and made a hook so I could hook the block to the bogie before lowering the coach.
It worked great. Hook them on, drop it and done. No more back and forth positioning them.
Then I took it for a test drive and heard two thunks, couldn't figure out what it was.
I got home, where are my blocks?....Oh dang!
Only in a GMC can you run over a 4x4 and not really notice it!
I hope no one was behind me :(
I need to make another set, but this time they will have a long RED handle that makes it obvious they are under there
--
Keith
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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: [GMCnet] Pressure in bags when parked... [message #211685 is a reply to message #211672] |
Thu, 20 June 2013 11:24 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Thu, 20 June 2013 08:54 |
Keith,
I've been staying at the storage facility where JohnS and I keep our GMC's. Reception on my Verizon USB modem is poor so I bought a
remote antenna and put it on top of the building - MUCH BETTER!
Last Sunday when I went to dump and refill with water I pulled out and was driving down between the buildings when I heard someone
call out - HEY YOU'RE DRAGGING SOMETHING!
The remote antenna!
Fortunately it still works but now there's a Post It Note on the steering wheel "ANTENNA STUPID!"
Regards,
Rob
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Maybe instead of the overused "remove Before flight" tag I'll make a "Remove Before Driving Stupid!" tag !
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Pressure in bags when parked... [message #211742 is a reply to message #211706] |
Thu, 20 June 2013 22:28 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I also keep my coach parked with air pressure in the (OEM) bags. They are only about five (right side) and six (left side) years old. I set the power level valves to Travel when I park it and let it settle, then shut off the ball valves at the tanks. This makes the load on the bags relatively even and prevents 'hot dogging'.
I remember hearing a story about a guy here that evidently drains the air out of his bags and blocks the rear end whenever he parks, even for the short term. His coach somehow fell off the blocks and the short fall and abrupt stop cracked one of his windshields. I would rather not take that kind of chance. I'll keep air on the bags, thank you. Less risky in my opinion.
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] Pressure in bags when parked... [message #211743 is a reply to message #211742] |
Thu, 20 June 2013 22:32 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Carl S. wrote on Thu, 20 June 2013 20:28 |
I also keep my coach parked with air pressure in the (OEM) bags. They are only about five (right side) and six (left side) years old. I set the power level valves to Travel when I park it and let it settle, then shut off the ball valves at the tanks. This makes the load on the bags relatively even and prevents 'hot dogging'.
I remember hearing a story about a guy here that evidently drains the air out of his bags and blocks the rear end whenever he parks, even for the short term. His coach somehow fell off the blocks and the short fall and abrupt stop cracked one of his windshields. I would rather not take that kind of chance. I'll keep air on the bags, thank you. Less risky in my opinion.
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PS. My coach gets driven monthly as well. If I were storing it for months at a time, I might consider draining the bags.
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] Pressure in bags when parked... [message #211746 is a reply to message #211743] |
Thu, 20 June 2013 22:44 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Do as you want
We only have. 40 years of history on them
And
When a bag blows it only costs $4,000 to fix the fiberglass damage.
JWID
Gene
FREE WIFI @ Mickey D
On Jun 20, 2013, at 8:32 PM, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
>
> Carl S. wrote on Thu, 20 June 2013 20:28
>> I also keep my coach parked with air pressure in the (OEM) bags. They are only about five (right side) and six (left side) years old. I set the power level valves to Travel when I park it and let it settle, then shut off the ball valves at the tanks. This makes the load on the bags relatively even and prevents 'hot dogging'.
>>
>> I remember hearing a story about a guy here that evidently drains the air out of his bags and blocks the rear end whenever he parks, even for the short term. His coach somehow fell off the blocks and the short fall and abrupt stop cracked one of his windshields. I would rather not take that kind of chance. I'll keep air on the bags, thank you. Less risky in my opinion.
>
>
>
> PS. My coach gets driven monthly as well. If I were storing it for months at a time, I might consider draining the bags.
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
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| Re: [GMCnet] Pressure in bags when parked... [message #211779 is a reply to message #211746] |
Fri, 21 June 2013 09:17 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Mr ERFisher wrote on Thu, 20 June 2013 20:44 |
Do as you want
We only have. 40 years of history on them
And
When a bag blows it only costs $4,000 to fix the fiberglass damage.
JWID
Gene
FREE WIFI @ Mickey D
|
Thank you Gene. I will. Just after I got my coach, the right bag blew out in my driveway one night. The PO had put green "Slime" in it to try to stop a leak (the leak turned out to be in the plumbing to the bag) and it softened the bag. There was no damage to anything but the bag.
Although I admit to not having studied it extensively, I haven't seen anything in the operating manual about draining the pressure out of the air bags when parked. I don't believe the GM engineers ever had that in mind when they designed the system. Like I said, if my coach spent all it's time in the driveway, like some people's here, I would probably let the air out and park it on blocks. Too much hassle for a regularly driven coach. JWIT
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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