| Back suspension height adjustment [message #242889] |
Mon, 10 March 2014 06:44  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Just want to check to see if I got this right. I've had a leak down issue with my passenger side rear suspension quad bags. I got that leak fixed I beleive. The other issue is the paasenger side seemed to be lower than the driver side. I put the Autolevel mode on and when it shut off...the passenger side measured 33" to the rear wheel well skirt seam and the driver side measured 35"...so a difference of 2"...I read the manual and it mentioned the leveling arm adjustment nut. It said to loosen it and make the coach level..34" to the seam on both sides...which measure roughly 11 3/4" at the back slot in the main frame, then re-tighten. So my question is, did I get this right. Will this now correctly level at 34" on both sides? Seemed to be pretty straight forward to make this adjustment.
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Back suspension height adjustment [message #242897 is a reply to message #242889] |
Mon, 10 March 2014 08:55  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Tom,
I just checked MM X-7525, MM X-7625, and MM X-7725 and could not find any instructions to set the ride height at 34 inches as
measured to the rear wheel well skirt where did you find those instructions.
To set the ride height (front & rear) for your coach see MM X-7525 Section 4 - Rear Suspension - Page 4-34 - Figure 70 - Checking
Vehicle Ride Height.
Once you've done that you can then measure the distance from the ground to the wheel well skirt.
The reason you should use the slots in the frame first is because the height of the body varies depending on the distance the body
is off the frame. If you have old OEM crushed pads it could be a 1/4 inch off the frame; if you have new pads from the Curtis's they
are 3/4" thick.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: tom geiger
Just want to check to see if I got this right. I've had a leak down issue with my passenger side rear suspension quad bags. I got
that leak fixed I beleive. The other issue is the paasenger side seemed to be lower than the driver side. I put the Autolevel mode
on and when it shut off...the passenger side measured 33" to the rear wheel well skirt seam and the driver side measured 35"...so a
difference of 2"...I read the manual and it mentioned the leveling arm adjustment nut. It said to loosen it and make the coach
level..34" to the seam on both sides...which measure roughly 11 3/4" at the back slot in the main frame, then re-tighten. So my
question is, did I get this right. Will this now correctly level at 34" on both sides? Seemed to be pretty straight forward to
make this adjustment.
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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: Back suspension height adjustment [message #243058 is a reply to message #242889] |
Tue, 11 March 2014 19:40 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Sorry Bob for the delay. I had measure back at the slotted hole where the manual says to. It measured roughly in the 11 3/4" range on both sides. I then measured at the center of the wheel well and verticaly at the wheel well seam. It measure 34". So I'm happy with it's height now. My question was pertaining to the level control arm back there. The manual shows to loosen the bolt so that the slotted hole on the level arm allows the level arm to move a bit, then you set the height where you want it and then re-tighten the bolt. Just wanted to know if I understood the process correctly? Not understanding how this process will set my ride height when I set it to auto??
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Back suspension height adjustment [message #243078 is a reply to message #243058] |
Tue, 11 March 2014 21:20 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Tom,
Got it!
Yes, you are correct loosening the bolt and moving the arm is how you adjust the rear suspension.
HOWEVER, that is a PITA! It is very hard to move it the correct amount to get the slot in the rear to the right height.
The arm is connected to the bogie by a fixed length link; it is a hell of a lot easier to adjust the rear suspension with adjustable
links:
Note: URL's listed in alphabetical order by vendor name.
Ken Henderson / Jim Kanomata: http://www.appliedgmc.com/prod.itml/icOid/704
Dave Lenzi: http://www.bdub.net/lenzi/index.html
Scroll down to "Embossed copper exhausts manifold gaskets" and you can see a picture of Dave's links. I believe they cost more
because they have a heim joint at each end. There is NO WAY I will make any comments as to which one is "better" as I have NO idea!
Plus Ken, Jim, and Dave are all close friends.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of tom geiger
Sent: Wednesday, March 12, 2014 11:40 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Back suspension height adjustment
Sorry Bob for the delay. I had measure back at the slotted hole where the manual says to. It measured roughly in the 11 3/4" range
on both sides. I then measured at the center of the wheel well and verticaly at the wheel well seam. It measure 34". So I'm happy
with it's height now. My question was pertaining to the level control arm back there. The manual shows to loosen the bolt so that
the slotted hole on the level arm allows the level arm to move a bit, then you set the height where you want it and then re-tighten
the bolt. Just wanted to know if I understood the process correctly? Not understanding how this process will set my ride height
when I set it to auto??
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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GMCnet mailing list
Unsubscribe or Change List Options:
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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] Back suspension height adjustment [message #243080 is a reply to message #243058] |
Tue, 11 March 2014 21:23 |
Chris Grant
Messages: 22
Registered: February 2014
Karma: 0
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Junior Member |
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When you have the coach at the desired height via manual raise/lower control, place the selector switch in hold. Loosen the nut to let the height control lever move to its center position. Once it's settled, tighten the nut. This becomes your new auto set point. You already have your desired height set before you ever loosen the nut.
All typos, misspellings, grammatical and/or factual errors are property of Apple, inc. and the iPhone virtual QWERTY keyboard.
> On Mar 11, 2014, at 8:40 PM, tom geiger <tgeiger@burnsmcd.com> wrote:
>
>
>
> Sorry Bob for the delay. I had measure back at the slotted hole where the manual says to. It measured roughly in the 11 3/4" range on both sides. I then measured at the center of the wheel well and verticaly at the wheel well seam. It measure 34". So I'm happy with it's height now. My question was pertaining to the level control arm back there. The manual shows to loosen the bolt so that the slotted hole on the level arm allows the level arm to move a bit, then you set the height where you want it and then re-tighten the bolt. Just wanted to know if I understood the process correctly? Not understanding how this process will set my ride height when I set it to auto??
> _______________________________________________
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| Re: [GMCnet] Back suspension height adjustment [message #243083 is a reply to message #243058] |
Tue, 11 March 2014 21:29 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Tom,
There's a detent (spring-loaded center position) in the travel of the input
shaft of the leveling valve. When in that position, the valve neither adds
nor releases air from the air bag. When you loosen the arm bolt, set the
ride height, and re-tighten the bolt, you've adjusted the linkage to
correspond with that detent. Now, when a change in the height of the coach
moves the valve out of the detent, the valve adjusts the bag pressure to
correct the height -- after a few seconds of delay (to prevent "hunting").
HTH,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL
www.gmcwipersetc.com
On Tue, Mar 11, 2014 at 8:40 PM, tom geiger wrote:
>
>
> Sorry Bob for the delay. I had measure back at the slotted hole where
> the manual says to. It measured roughly in the 11 3/4" range on both
> sides. I then measured at the center of the wheel well and verticaly at
> the wheel well seam. It measure 34". So I'm happy with it's height now.
> My question was pertaining to the level control arm back there. The
> manual shows to loosen the bolt so that the slotted hole on the level arm
> allows the level arm to move a bit, then you set the height where you want
> it and then re-tighten the bolt. Just wanted to know if I understood the
> process correctly? Not understanding how this process will set my ride
> height when I set it to auto??
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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