Author Topic: Magnum Chassis Parts  (Read 4160 times)

Peter Buenting

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Magnum Chassis Parts
« on: April 09, 2024, 02:59:08 PM »
2001 Beaver Marquis Jasper, 64k miles, C-12 Cat, Allison 4000.

I’m guessing this has been asked before but can’t seem to locate it. My apologies if this has been asked/answered a gazillion times. I’d like to find a Magnum chassis parts diagram, in whole or part. The current need is for a front stabilizer arm or bushings. I’m not sure if that’s the correct name, the rod that runs between the sides of the chassis, just behind the steering crossmember. Recently the bracket that holds this arm on passengers side broke off while on a trip. It looked like it had been repaired before and by someone who didn’t really know how to weld!  :-\ Locating parts on a Saturday afternoon wasn’t going to happen so settled for welding the bracket back on and dealing with the poor handling till we get home.

Which brings me to my question. How does one find part numbers for all of these chassis components? If it was a Freightliner I could at least find a part number and start sourcing the part. The front bushing on this arm are bad and according to the tech, all the suspension bushings in front are worn out. Even before this happened the ride is harsh and steering loose. I had it in for a front end alignment which helped some but now feels worse than ever.  I’m new to the RV thing and Beavers in particular.

So, any keywords to search for, links to threads, or an actual part’s diagram and/or source would be extremely appreciated. I’ve read how you all really value the ride and durability of these rigs which is why we jumped on it, but after this my bride is starting to question my judgment.  :(  Thanks! Pete
2001 Marquis Jasper 40’
Cat C12
Jeep Gladiator
‘02 Goldwing

Steve Huber Co-Admin

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Re: Magnum Chassis Parts
« Reply #1 on: April 09, 2024, 07:24:14 PM »
Peter,
The latest year parts list we have is for 1998 models. It's available on the club website (not the Forum). Select Technical, Coach Assist, Brochures for almost All Beaver Coaches, Safari Motorcoach Corporation (1994-2001). Scroll down a bit and you will find parts lists.
Another and maybe faster option would be to call the parts dept at Beaver Coach Sales, or Hendersons Line Up. Both in OR.
Steve
Steve
2015-          07 Contessa Bayshore C9,  400 hp
2013-2015: 00 Marquis Tourmaline, C12, 425 hp
2005-2013: 01 Contessa Naples, 3126B, 330 hp

Eric Maclean

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Re: Magnum Chassis Parts
« Reply #2 on: April 10, 2024, 01:23:18 PM »
Peter
There is no known parts list existing for the Magnum chassis as they seem to have been destroyed or deleted over the years and many ownership transfers of the Beaver coach corp.
How ever many of us here at the BAC have been through and sourced the parts your looking for.
Your Magnum chassis front suspension is a four link setup with two track bars these are known as torque rods unfortunately these particular torque rods are a spherical ball type units and as such the end balls are not serviceable meaning the rods must be replaced if they were out ,they where originally made by Dayton for use on Fruehauf semi trailers .
These torque where made in several different lengths for different applications but as the demand for them dropped the current manufacturer only provides a weld together kit to allow you to create the length you need .
On your coach that length should be 40 inches center to center.
If your ball ends are loose the rods will have to be replaced but if the ends aren't loose you can sometimes free up the end drill and install grease fittings and new seals which have found to fit the rods this procedure is should in the coach assist section under common problems .
If the mounting bracket broke off the frame it is likely that the ball end had seize on the torque rod causing the bracket to twist back and forth with the suspension movement until the bracket failed.

Here is a link to the rod/s you need
https://www.truckspring.com/products/Torque-Rod-Fruehauf-3-Piece-30-to-40-Inches__TS-345-812.aspx

The harsh ride can be helped by using Koni FDS shocks which are valved differently than the stock Bilsteen shock.
It's also important to have your coach weight for each corner and set the tire pressures to match the weight they are carrying in accordance to the tire manufacturers chart.
If you are experiencing porposing on bumps the installation of motion control units sold by super steer will help eliminate that.

Wandering can also be addressed by checking all steering linkage for play and checking ride height against the manufacturer spec as too high a ride height will result in wandering and the feeling that your riding on a bottle ( sliding off one side or the other)
Of course there is also alignment issues which can cause poor handling and don't forget the rear end the coach can have a rear steer issue caused by loose or worn torque rods back there as well.the torque rods for the rear end are much shorter and use a different sized bolt mounting the part number for those kits is 345-802 as below.
https://www.stengelbros.net/345-802-Uni-Rod-Kit_p_11489.html?gad_source=1&gclid=CjwKCAjw8diwBhAbEiwA7i_sJZO_-JJ91Uz_bCjH1Gy8oR_gzHcQO-ooEKnNDrDbYArwq_JwFL8TiRoC8aQQAvD_BwE

Hope this helps
Eric



« Last Edit: April 10, 2024, 01:45:22 PM by Eric Maclean »
1997 Patriot Yorktown
3126-B
2009 Chevy HHR
Roadmaster falcon tow bar
Demco Air Force one tow brake.
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Peter Buenting

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Re: Magnum Chassis Parts
« Reply #3 on: April 11, 2024, 02:48:28 PM »
Excellent information!!  All of the symptoms described are what we are experiencing. I was wondering about tire pressure. When it came back from the shop last fronts were at 120 psi. Seems high.

I’ll have to get it on a scale and see where we are at. Thanks much.
2001 Marquis Jasper 40’
Cat C12
Jeep Gladiator
‘02 Goldwing

Eric Maclean

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Re: Magnum Chassis Parts
« Reply #4 on: April 11, 2024, 05:03:40 PM »
Peter
Often the techs will set your tire pressure at the maximum cold rating written on the side of the tire and you will also find the coach manufacturer will us the maximum inflation numbers on the vehicle weight I'd placard behind the driver's seat on the wall . In both cases they do this to limit their liability as they have no control on how you load your vehicle .
Remember as the weight goes up the tire pressure must be St to match the tires weight carrying ability for that weight, the only way to get that right is to weigh the vehicle at each wheel position and compare the weight to the tire manufacturers load chart for that given tire .
As a rule of thumb you take the heaviest side per axle add about 10% and use that tire pressure for both sides of that axle this gives you a safety factor.

If the torque rods are worn out that is the first place to start on your journey to handling improvements.

Eric
1997 Patriot Yorktown
3126-B
2009 Chevy HHR
Roadmaster falcon tow bar
Demco Air Force one tow brake.

Bill Lampkin

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Re: Magnum Chassis Parts
« Reply #5 on: April 12, 2024, 03:18:24 PM »
Do a search for Monaco watts, excellent info on handling issues
2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

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Joel Ashley

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Re: Magnum Chassis Parts
« Reply #6 on: April 13, 2024, 02:30:09 AM »
Just as a suggestion beyond the qualified already posed, if you can get up to our sponsor, Henderson’s Line-up, in Grants Pass, Oregon, they are arguably the nation’s best at improving everything motorhome chassis.  You would not come away anything other than satisfied and glad you made the trip.

https://www.hendersonslineup.com/

Joel
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Keith Moffett

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Re: Magnum Chassis Parts
« Reply #7 on: April 14, 2024, 12:05:22 PM »
Peter
Just an FYI, we had the 2001 Marquis and it had a severe wandering issue.  We had it in 3 shops and everyone missed it.  Turned out the wandering was mainly the loose pitman arm locking ring on the steering box.
Good luck
2007 Patriot Thunder
45' C-13
2006 Explorer Ltd.
DW is Carol
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Dale Barham

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Re: Magnum Chassis Parts
« Reply #8 on: May 04, 2024, 07:38:09 PM »
Peter, Kaiser Brake and alignment made and replaced the 5 front torque bars on our 2001 patriot thunder ,made a world of difference. They are in Eugene,Oregon. I highly recommend them.
Dale & Sue Barham
With Vizslas Lux & Gypsy, & Cat Tweety
2001 Beaver Patriot Thunder
2011 Honda CRV Toad