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Recommended hight for FMC ??
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ricogomez
Posted 2019-05-01 6:47 PM (#6379)
Subject: Recommended hight for FMC ??


Veteran

100252525
Location: Houston, Texas
Hello friends, We are in the process of finishing our rear
Air bag helpers to bring the back up to specs or close to it,
and we haven’t found the info here yet, I’m sure it has been
asked before, but I was unable to locate it.

Help

Rico & Carmen
397 12V Cummins & 6 speed Allison
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hemi354az
Posted 2019-05-03 4:41 PM (#6380 - in reply to #6379)
Subject: Re: Recommended hight for FMC ??


Extreme Veteran

50025
Location: Scottsdale, Aridzona
Hey Rico,
Thought some of the other Rocket Scientist would have responded to your question by now . . .
In the FMC Service Manual, Group 7 Steering - it talks about Alignment, and also in:
Service Bulletin 2907-4002 Page 2, Coach #s 1-645, Figure 1 (top left picture),
and
Service Bulletin 2907-4003 Page 1, Coach #s 646- up, (bottom of page),
the "rear of the Coach should be 1/8" (inch) lower than the front".

That 1/8" is consistent throughout the Service manual and Service Bulletins . . . but, but, but . . . FMC doesn't say where that measurement applies ! (that I could find)
At Front/Rear Bumper ? Perimeter Frame Rail behind front wheel and in front of rear wheel ? Front/Rear wheel center to wheel well max height above wheel center ? Some other place ?
Front Suspension height is set by the Front Spring and is essentially "non-adjustable". Rear Suspension height is set by the Torsion Bars (adjustable, but I would leave them alone if the both look like they are screwed in/out the same) . . . and in your case also by the add-on Rear Air Bag Pressure.

1/8" on a 185" wheel base ?
1/8" on a 348" OAL ?
Pffft !
Gas/Water it . . . Air tires to what you want to run . . . adjust air bag pressure to get the frame rails (both sides between the F/R wheels) LEVEL . . . make a stick that you can put under those four (Jacking Points) as a reference how you started out . . .
and RUN IT !

When all else fails . . . look in the FMC Owner's Manual, FMC Service Manual, FMC Parts Manual. Lots of information there !
Happy TRAILS ! Lou #120


Edited by hemi354az 2019-05-03 4:43 PM
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LCAC_Man
Posted 2019-05-03 9:22 PM (#6382 - in reply to #6380)
Subject: Re: Recommended hight for FMC ??


Elite Veteran

5001001001002525
Location: Oceanside, CA
I agree with Lou, set it to level...any assumption about the 1/8" difference/factory height would have been made with the 440/727 weight, you are way beyond that on the rear. I set my front bags to 25psi, then use my rears to level it out, depending on tongue weight that can be as little as 50psi or the highest I've run which is 85psi. In high winds I run pretty high too, it really stabilizes the coach.
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ricogomez
Posted 2019-05-06 8:34 PM (#6385 - in reply to #6379)
Subject: Re: Recommended hight for FMC ??


Veteran

100252525
Location: Houston, Texas
Thank You for the info & input, ours has great steering right now, but we want it to bring the back up again, with this info we know what
do and what we can expect.

Rico & Carmen

397
12V Cummins & 6 Speed Allison
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