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Old 02-24-2019, 07:06 AM   #1
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Roadmaster M-series chassis - why?

I writing a Beaver Chassis history document, and have been collecting all the info I can on the various chassis' used. I have one unanswered question.

In 2003 (after Monaco bought SMC/Beaver) they started using the "M-Series" chassis for the Beavers. Beavers exclusively from what I can tell.

Does anyone know the reason?
Roadmaster already had the RR8 and RR10 chassis? Why didn't they just use that chassis from the start?
-Maybe something about the "Beaver body design/layout" required a new chassis design, or maybe just to differentiate the Beaver line from the Monacos?

The M-series was used from 2003-2006. After that Monaco used their RR8/RR10 and S-series chassis for the Beavers.
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Old 02-24-2019, 07:23 AM   #2
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I read this in another thread.

Quote:
Originally Posted by BillJinOR View Post
When Monaco bought Beaver/Safari they used the existing Safari Magnum chassis for several years and just stuck the Roadmaster name on them .. perhaps they had a large stock of them. That’s the M in the Roadmaster M chassis. The magnum was very similar to the Roadmaster with the great out board airbags etc. my understanding is it was a little heavier design with larger airbags than the Roadmaster. My marquis has larger bags and different frame to floor sound deadening than the equivalent Monaco’s of the time.
03’s and I believe 04’s we’re still built by “ beaver” in Bend Oregon after that they were moved to Eugene/ Coberg and the Monaco plan Monaco gradually made them a rebadged Monaco by 05/06
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Old 02-24-2019, 08:33 AM   #3
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I have the quote/info in my history document - but it doesn't answer the question, and it is a little misleading.

The "M" referred to above is the "Magnum" chassis (as they used up the old Magnum chassis stock) - it is not the "M" in Roadmaster "M-Series".

It was a confusing time when Monaco took over SMC/Beaver. They used the old Magnum chassis up to 2003 then they started with the new Roadmaster M-Series.

Monaco wanted to use up the Magnum chassis and I think they also needed the time to figure out what chassis in the Roadmaster line up to use for the Beaver - and then for some reason they decided to build the "new" Roadmaster M-Series. Then, as I mentioned, above, after three years they dropped the M-Series and used the RR and S-series chassis for the Beavers.
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*SMC-Bvr-Mnco Chassis/Suspsn/Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 02-26-2019, 08:27 AM   #4
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I know that a good friend of mine had a 2004 Beaver Marquis and it was on a Magnum chassis for sure. I have an 04 Signature on an S series chassis. When I was under his coach it was differently built than mine. The only thing he complained about was stiff ride and when crossing bridges it was a rough ride where mine was not. It was probably the shocks it had...

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Old 02-26-2019, 08:53 AM   #5
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Based on the Beaver brochures (which we know are not 100% accurate) and Owners manuals this is what I came up with. Research still on-going - and feedback appreciated

Gillig (1984 – 1997): (Raised Frame Rail, MH3208T) 8”x3.5”
x.25” U-Channel, Double Flange, Huck-bolted, using SAE 410 grade 960
Steel Stock: 1984 – 1998 Marquis (Cummins B5.9, C8.3, or Cat C12,
3208, 3176, or DD 6V92T, 8V-92T); 1989-1993 Contessa (Cat 3208),
1993 Baronet (Cat 3116)

Prevost (1989-1992): Prevost le Mirage XL MTH-40 bus: 1989-
1992 “Beaver XL” 40-ft conversion (Detroit Diesel 8V-92TA. GVWR
42,000)

Spartan (1993-1995):
EC-2000 (31ft): 1993 Patriot (Cummins B5.9)
IC series (>33ft): 1993-1995 Patriot (Cummins C8.3 or Cat 3176)
Mountain Master Series: 1994 Acclaim, 1994 Contessa (Cummins
C8.3)

Magnum (SMC) (1993-2002):
B-Series B30A330 “Magnum Air”: 1996 -2002 Patriot (Cat 3126B),
1998-2001 Contessa (Cat 3216),
C-Series C40A425 “Big Cat”: 1998-2002 Patriot Thunder (Cat C12)
D-Series B40A425 “Blue Diamond”: 1998-2002 Marquis (Cat C12)
M-Series “Blue Max”: not used on Beaver coaches
S-Series S26A330 “Blue Streak” (Ellipi-Ride or Rayco Air): 1996-2001
Monterey (Cat 3216)

Roadmaster (Monaco) (2002 – 2009)
Roadmaster “Magnum Air” B-Series”: 2002 Contessa (Cat 3126E),
2002 Monterey (Cat 3126E)
RR4R: 2003 Baron (ISB 5.9, ISC 8.3)
RR8R: 2003-2005 Santiam (Cummins ISC 400 or Cat C9), 2009
Contessa (Cummins ISC 8.3)
RR8S / RR10S: 2007-2009 Contessa (Cat C9), 2007-2009 Monterey
(Cummins ISL8.8 or cat C9)
M-Series (M8R): 2003 Monterey (Cummins ISC 350)
M-Series (M8S / M10S): 2003-2005 Marquis (Cat C12/C13), 2003-
2005 Patriot (Cat C9, ISL 400)/Patriot Thunder (Cat C12/C13), 2003-
2006 Monterey (ISC 350 or Cat C9), 2003-2006 Contessa (ISL 370)
S-Series: 2006-2009 Marquis (Cat C13/ C15 or DD 60 series), 2006-
2009 Patriot/Patriot Thunder (Cat C9 or C13)
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*SMC-Bvr-Mnco Chassis/Suspsn/Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 03-30-2019, 09:18 PM   #6
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Holy smokes that is a lot of info!
My favorite in that list is S-Series: 2006-2009 for the time period and engine option. Not sure about other details but chassis wise, yes.
Nice work on your research.
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Old 03-31-2019, 06:56 AM   #7
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Here is a link to the Beaver "Chassis History" document (and some older chassis manuals I collected). I hope this provides some interesting reading (and let me know if you find any errors, or have additional information to add)

https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
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*SMC-Bvr-Mnco Chassis/Suspsn/Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 11-08-2019, 07:23 AM   #8
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Now the question has been answered!

I got new information from the Beaver Ambassador Club on this old question.
Also as noted by others (spdrcr39) in this post.

I have enough confirmation/information now to confidently state that "the Roadmaster M-Series chassis is just the SMC Magnum chassis". Roadmaster just renamed the SMC Magnum chassis to get their "Roadmaster" name used.

So the 2003-2005 Beaver Patriot and Marquis (Tax Axle coaches) are using the SMC Magnum D-series (a.k.a. Blue Diamond) chassis.

And the 2003-2005 Monterey, Patriot (non-Tag) are using the SMC Magnum B-Series (Magnum Air) chassis.

Then in 2006 the Marquis and Patriot Thunder where moved to the Roadmaster S-series, and the Monterey and Contessa were built on the Roadmaster RR series chassis.

This was done for two reasons I'm told; one - to use up the Magnum chassis already built, and two - to give Monaco time to redesign the coach structure (and/or modify the Roadmaster chassis) in order to move the Beaver coaches over to the Roadmaster RR and S chassis. Probably more of reason "one" than "two".
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*SMC-Bvr-Mnco Chassis/Suspsn/Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 11-08-2019, 07:39 AM   #9
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Country My 2004 Monterrey Laguna 4 slide ISC350 has the 8 air bag side radiator. The brochure calls it a Roadmaster M series. Is this an RR8s or an M8S. And if its a simple explanation what is the difference?
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Old 11-09-2019, 07:35 AM   #10
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OK after further research and reading some very well researched and documented information and the vin decoder you posted I definitely have the Roadmaster M8S chassis contrary to what I was told by someone else. This will make ordering parts much easier thanks for all the work you put into this !
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