Best Jack Adapter

C

charles boyd

New member
Jul 8, 2007
3,462
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Sir: the #1 cast jack adapter will not work with Tom Pryor reaction arm anchor block.
The #2 welded one for rear will work on Tom Pryor reaction arm anchor block.
The #3 I have no experience with nor do I have any experience with Manny's reaction arm anchor block.

> Hi All,
>
> I would like to buy a jack adapter for my coach. Jim K lists 3 on his website - two that lift only the back and one that can be used front and
> back. I'm thinking the one for front and back would be best, but wanted to make sure that was the consensus. Here are the options -
>
> Back-only #1 https://www.gmcrvparts.com/product-p/rv101.htm
> Back-only #2 https://www.gmcrvparts.com/product-p/ap40-1.htm
> Front and Back https://www.gmcrvparts.com/product-p/ap40.htm
>
> Thanks as always for your help!

--
C. Boyd
76 Crestmont
East Tennessee
 
Chuck,
The Duel unit is designed to work well when a tire gois flat as the frame
at that point is too low to accept a standard Bottle Jack.
We acquired this fine design from a person that wanted to quit making them.
We also supply a two stage bottle jack, the Stubby Jack was discontinued .

On Tue, Feb 4, 2020 at 6:09 PM Charles Boyd via Gmclist <

> Sir: the #1 cast jack adapter will not work with Tom Pryor reaction arm
> anchor block.
> The #2 welded one for rear will work on Tom Pryor reaction arm
> anchor block.
> The #3 I have no experience with nor do I have any experience with
> Manny's reaction arm anchor block.
>
>
>
>
>
>

> > Hi All,
> >
> > I would like to buy a jack adapter for my coach. Jim K lists 3 on his
> website - two that lift only the back and one that can be used front and
> > back. I'm thinking the one for front and back would be best, but wanted
> to make sure that was the consensus. Here are the options -
> >
> > Back-only #1 https://www.gmcrvparts.com/product-p/rv101.htm
> > Back-only #2 https://www.gmcrvparts.com/product-p/ap40-1.htm
> > Front and Back https://www.gmcrvparts.com/product-p/ap40.htm
> >
> > Thanks as always for your help!
>
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmcrvparts.com
1-800-752-7502
 
Sir, I have 2 of the #2 welded jack adapters and 2 yellow Ford two stage bottle jacks that I use to raise the back of coaches to put on jack stands.
It does clear all wheels off the ground. I also carry them when traveling. Our Crestmont does not have campground leveling valves and I use to level
coach when parked. I used to use floor jacks to raise rears but required jacking on anchor bracket. I don't believe it was an issue but I am more
comfortable with the hooks and bottle jacks.

Jim K. I have not held or tried the front hook style. Does it hook to frame just anywhere on either side or does it need to be in a specific place
to raise front to change tire? Can it be used on the middle of the crossmember to jack up front of coach level to put on jack stands?

> Thanks All! I have the OEM brake setup in the back (drums), so no reaction arms to be concerned with, although that may be an upgrade I consider
> in the future. I'll probably go with the dual jack, but just wanted to see if anyone had used it or had recommendations for one or the other. I
> have a 2 stage bottle jack that the PO gave me and am hoping that will work fine with the adapter.

--
C. Boyd
76 Crestmont
East Tennessee
 
I have the Dual front-rear model and also a 2-stage Ford jack. I have not needed to use the adapter yet.

Two things though:
- The Ford 2-stage jack, the jacking pad is too large to fit into the adapter. I plan on having this modified, but in the meantime I carry a single
stage jack that fits as well.

- The dual adapter does not fit between my bogie greasers so they would need to be removed when I need to use it.

Also, don't forget you need a bar to fit through the bogie bracket so you don't need to jack the coach up as high to raise the wheels.

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
 
> Thanks Bruce.
>
> I understand that the bar is used to prevent the wheels from dropping too far and damaging he shocks. Is that always needed or could I just let
> the air out of the bags before I jack it up very high? Just got my coach late last summer and I haven't actually jacked it up yet, so trying to
> learn as much as possible before I break something (which is how I often learn anyway).

Here is what I've used.
http://www.gmcmhphotos.com/photos/g6509-blaze-orange-bogie-leaf-spring.html
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
If you lower the pressure as you unweight the bag by lifting you will not
have any risk of damaging anything. That said I have lifted mine several
times without unloading the bags as I did not know that was a thing and
nothing got damaged. I believe it is POSSIBLE to damage the shocks or the
shock mounts by lifting the coach with air pressure in the bags but I think
it is not so much the norm. If you think about it a little there are times
under not super unusual driving conditions where one of the arms will swing
out freely and the only thing that stops it is the shock absorber. I think
the loads encountered by the shocks in these situations must be more severe
than a gradual loading such as when jacking. Many passenger cars have the
shocks as the limiting factor in suspension extension and these shocks are
also working against a spring which is trying to grow. I suspect old shocks
with worn mounts are the ones which fail or rigs which are lifted with huge
pressures in the bags.

Sully
Bellevue wa.

On Wed, Feb 5, 2020 at 6:45 PM Larry via Gmclist
wrote:

> > Thanks Bruce.
> >
> > I understand that the bar is used to prevent the wheels from dropping
> too far and damaging he shocks. Is that always needed or could I just let
> > the air out of the bags before I jack it up very high? Just got my
> coach late last summer and I haven't actually jacked it up yet, so trying to
> > learn as much as possible before I break something (which is how I often
> learn anyway).
>
> Here is what I've used.
> http://www.gmcmhphotos.com/photos/g6509-blaze-orange-bogie-leaf-spring.html
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Chuck,
There is a round hole in the inner frame where the front joins the side
rail.
Plke the sharp end in and swing it to the outside.
You can go to our sight and get the instruction sheet

On Wed, Feb 5, 2020 at 6:45 PM Larry via Gmclist
wrote:

> > Thanks Bruce.
> >
> > I understand that the bar is used to prevent the wheels from dropping
> too far and damaging he shocks. Is that always needed or could I just let
> > the air out of the bags before I jack it up very high? Just got my
> coach late last summer and I haven't actually jacked it up yet, so trying to
> > learn as much as possible before I break something (which is how I often
> learn anyway).
>
> Here is what I've used.
> http://www.gmcmhphotos.com/photos/g6509-blaze-orange-bogie-leaf-spring.html
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmcrvparts.com
1-800-752-7502
 
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