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Harrison four bag bolts [message #353892] Fri, 17 April 2020 09:29 Go to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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Senior Member
I've got everything together to install a Harrison four bag system on my coach ACCEPT for the bolts that hold the bogies and Harrison to the frame. Anybody out there know the length of bolt needed for this? The Harrison that I obtained is used off of a parted out coach, and came to me without the bolts. I could take it apart an add the thickness of the Harrison to the length of the old bolts, but would prefer to have the corrected bolts on hand when I get that far into the project. TIA


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: Harrison four bag bolts [message #353896 is a reply to message #353892] Fri, 17 April 2020 11:39 Go to previous messageGo to next message
Jp Benson is currently offline  Jp Benson   United States
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Registered: October 2011
Location: Fla
Karma: 2
Senior Member
Two inches. The bolts on mine extend 1-1/2" outside the frame. The frame consists of three layers. Outer frame, inner ladder frame and cross-member flange which adds up to another `1/2". So a total of 2". The exposed part of the shank is ~1/4". Here's what the inside looks like.

http://www.gmcmhphotos.com/photos/frame/p49148-back-of-bogie-assembly.html

I've seen a number of the Harrison bags where the top of the backing plate is bent back from the force of the airbag. On mine I fitted a piece of 1-1/2" thick wall SS tubing in the upper holes in the plates to prevent bending. Now the airbags oppose each other rather than just the plates.

http://www.gmcmhphotos.com/photos/restoration-photos/p60933-harrison-air-bag-center-brace.html

It was a lot of work grinding the SS to length. Aluminum tube with 1/4" wall would work just as well. Others have cut a piece of wood to fit between the plates.

JP
Re: [GMCnet] Harrison four bag bolts [message #353899 is a reply to message #353892] Fri, 17 April 2020 11:45 Go to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Larry,

Are you asking about the 2 big bolts at the bottom of the pedestal? If so,
those are not bolts, they're the "bogie pins". The original nuts on the
outside, threaded, ends of the pins are replaced with 2-part nuts. The
larger part of the nut has a threaded shoulder onto which the pedestal
sits, with another nut on the threaded end of the shoulder holding the
bottom of the pedestal on the shoulder. That was Leigh's work-around to
prevent needing new, longer, bogie pins.

Off the top of my head, I don't recall any other bolts except those holding
the bags in place. Those should be easy to figure out. Let me know if you
need me to go refresh my memory (from '98 when I installed mine).

Ken H.

On Fri, Apr 17, 2020 at 10:30 AM Larry via Gmclist
wrote:

> I've got everything together to install a Harrison four bag system on my
> coach ACCEPT for the bolts that hold the bogies and Harrison to the frame.
> Anybody out there know the length of bolt needed for this? The Harrison
> that I obtained is used off of a parted out coach, and came to me without
> the
> bolts. I could take it apart an add the thickness of the Harrison to the
> length of the old bolts, but would prefer to have the corrected bolts on
> hand when I get that far into the project. TIA
>
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
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