GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Blocking the rear bogies...
Blocking the rear bogies... [message #169453] Sun, 13 May 2012 17:48 Go to next message
Mark of Excellence is currently offline  Mark of Excellence   United States
Messages: 18
Registered: December 2010
Karma: 0
Junior Member
I would like keep my coach sitting level while being stored due to a leaky air bag on one side. I want to put oak blocking under the rear of the coach and release the air from the bags and have the coach rest its entire weight on the wood blocks.

Is there any harm in doing this to the coach, and where exactly on the bogies is the proper place to block?

Or is it better for the coach to just completely deflate both bags and let the rear sit as low as it goes?


Benson
76' Birchaven
Florida
Re: [GMCnet] Blocking the rear bogies... [message #169458 is a reply to message #169453] Sun, 13 May 2012 18:05 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
Senior Member


Benson,

If you look at the bogies you will see that the bottom is not flat.
It tapers downwards as it gets closer to the frame. Before I left
the USA John Sharpe and I made up some blocks go under them. We set
the rear suspension to travel and started up the GMC. When it got to
the correct height and the pump shut off we measured the distance from
the bottom of the bogie where it attached to the frame. I can't
remember the measurement but I THINK it was 7 inches. We cut two 6"
x 6" blocks to 8 inches and attached a draw handle to each. I raised
the back of the GMC until they would fit under the bogies and then
switched to LOWER until the air bags were empty. Works a treat! By the
way this is NOT my idea, I saw it on Gene Fishers website.

Rob Mueller Sydney, Australia '75 Avion - AUS - The Blue Streak '75
Avion - USA - Double Trouble

----- Original Message -----
From:gmclist@temp.gmcnet.org
To:
Cc:
Sent:Sun, 13 May 2012 17:48:03 -0500
Subject:[GMCnet] Blocking the rear bogies...

I would like keep my coach sitting level while being stored due to a
leaky air bag on one side. I want to put oak blocking under the rear
of the coach and release the air from the bags and have the coach rest
its entire weight on the wood blocks.

Is there any harm in doing this to the coach, and where exactly on the
bogies is the proper place to block?

Or is it better for the coach to just completely deflate both bags and
let the rear sit as low as it goes?
--
Benson
76' Birchaven
Florida

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist


Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: [GMCnet] Blocking the rear bogies... [message #169459 is a reply to message #169453] Sun, 13 May 2012 18:05 Go to previous messageGo to next message
Mr ERFisher is currently offline  Mr ERFisher   United States
Messages: 7117
Registered: August 2005
Karma: 2
Senior Member
yes this is a good thing to do every time you come home.

saves hot-dogging the air bags
look here
http://www.gmcmhphotos.com/photos/jacking-up-the-gmc-hooks-ramps-n-stuff/p5274.html

and for more info
look here

http://gmcmotorhome.info/rear.html#RAISING

gene


On Sun, May 13, 2012 at 3:48 PM, Benson <Birchaven76@aim.com> wrote:

>
>
> I would like keep my coach sitting level while being stored due to a leaky
> air bag on one side. I want to put oak blocking under the rear of the coach
> and release the air from the bags and have the coach rest its entire weight
> on the wood blocks.
>
> Is there any harm in doing this to the coach, and where exactly on the
> bogies is the proper place to block?
>
> Or is it better for the coach to just completely deflate both bags and let
> the rear sit as low as it goes?
> --
> Benson
> 76' Birchaven
> Florida
>
>
>
> _______________________________________________
> 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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Re: Blocking the rear bogies... [message #169460 is a reply to message #169453] Sun, 13 May 2012 18:12 Go to previous messageGo to next message
tphipps is currently offline  tphipps   United States
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
Senior Member
This is almost exactly what I do when my coach is not in use. I built a platform of 4x4, cut to about 18", connected together with metal strapping (just for ease of moving them}. These go between the two rear wheels, with the blocking running from left to right. Then, I place another 4x4 in line with the frame. This one fits between the rear wheels. Then, I use 2x4 pieces to carry the load to the wooden platform. This is placed between the 2 rear tandem wheels on each side. I then jack up the boggies enough to slide the top pieces under the boggies center. Then lower the jack and release the air in the air bags. If I am going to leave it for a long time, I generally release most of the air in the air bags. This takes the load from the air bag system, and places it directly on the ground, carrying the load through the wooden platform.
I did this originally to reduce the weight of the rear end on my asphalt driveway, and I did not want to dent the soft asphalt. I do not use this as a leveling device, but to take the weight of the coach from the air bags. It does produce a fairly level coach, providing the driveway or ground is level.
Tom Phipps, MS II


2012 Phoenix Cruiser model 2552 KA4CSG
Re: Blocking the rear bogies... [message #169463 is a reply to message #169460] Sun, 13 May 2012 19:48 Go to previous messageGo to next message
Mark of Excellence is currently offline  Mark of Excellence   United States
Messages: 18
Registered: December 2010
Karma: 0
Junior Member
I understand the bottom of the bogie is not a flat surface. Should the wood block be positioned to the outside of the two frame bolts that hang down or should it be to the inside of them, or dead center under the two bolts and let them dig into the wood?

Benson
76' Birchaven
Florida
Re: Blocking the rear bogies... [message #169493 is a reply to message #169463] Mon, 14 May 2012 01:15 Go to previous message
mike miller   United States
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
Senior Member
Mark of Excellence wrote on Sun, 13 May 2012 17:48

I understand the bottom of the bogie is not a flat surface. Should the wood block be positioned to the outside of the two frame bolts that hang down or should it be to the inside of them, or dead center under the two bolts and let them dig into the wood?


Center your blocks on the boogie box. There is a slot in the bottom. Have the same amount of wood on each side of the slot.

Other notes:

-- IF you store your coach where it gets a lot of rain, you might want to store it a little low in the back.... it helps the drainage.

-- IF you have an early coach (73/74), you really want to block the rear when stored. The wheel-wells will drop down to the tires before the suspension bottoms out. Effectively resting the rear of the coach on the almost 40 year old, hard, brittle, plastic wheel-wells. This problem is made worse by larger (taller) than OEM tires. Later coaches have different suspensions and wheel-wells... SO, this is much less of a problem.


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
Previous Topic: HELP Fuel Leak
Next Topic: Electricity 101
Goto Forum:
  


Current Time: Sun Oct 06 07:29:25 CDT 2024

Total time taken to generate the page: 0.00959 seconds