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04-07-2015, 09:12 AM
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#1
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Montana Fan
Join Date: Feb 2005
Location: Brewster
Posts: 102
M.O.C. #3100
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loose King Pin mounting
I noticed that my bed rail clearance is less than it was before we started home from Arizona. I'm suspicious that the king pin has come loose from where it mounts to the frame. I am still hooked up and will be able to tell more when I can try moving the king pin. Has anyone had a similar problem?
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04-07-2015, 10:30 AM
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#2
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Montana Master
Join Date: Feb 2005
Location: Haysville
Posts: 4,261
M.O.C. #3085
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Boy Howdy, if you have a spacing between bed rail and fiver that shrunk enought to notice just by looking, I'd say you have something major going on. I wouldn't travel farther till you know what's going on. Even with just loose mounting bolts, I doubt if it would sag enough to notice.
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04-07-2015, 10:51 AM
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#3
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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My buddy had a similar problem: broken weld caused frame separation at the front cap. It also caused interior wall separation at the bedroom closet. Hopefully not the case with you, but something easy to fix, if in fact you have a problem
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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04-07-2015, 10:54 AM
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#4
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Montana Master
Join Date: Jan 2013
Location: Depends on temps
Posts: 1,648
M.O.C. #13157
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Tom, My guess would be the welds that hold the pin box bracket to the frame have failed or are failing.
My experience is a weld fails which allows the bracket to move and it will eventually cause the metal to fail. I would suggest you get the front overhang material around the pin box removed so you can see framing up there.
You might take some measurements hooked up. Remain hooked up and raise front with front jacks and see what moves or changes.
Jim
__________________
2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's
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04-07-2015, 01:11 PM
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#5
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,970
M.O.C. #5651
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This is the infamous 'frame flex' issue. Many threads about that a few years ago. I, myself, experienced it also. Just like others described - front closet paneling bows out and eventually cracks/breaks. Finally I got inside and had the wife either (forget which) raise it off the truck or the ground. I could seen the bow in the panel and a good bit of movement.
Had my local dealer (good service) remove the front cap, weld up everything, add in angle braces (forget what they are called). $1800 But I had used it for 7 years and around 70 or 80,000 miles on the trailer. So if you prorate it, that isn't that bad, I figured.
Good luck.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-07-2015, 04:03 PM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I was told by a factory tech to look at the seams around the lower part of the front cap. If that seam moves when hooked up, it's frame flex for sure.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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04-07-2015, 05:00 PM
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#7
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Site Team
Join Date: Aug 2007
Location: Omaha
Posts: 6,755
M.O.C. #7560
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Definitely sounds to me like it is Frame Flex. Check the seams like DQDick stated and if there is movement there, I'd be having a dealer somewhere along the way check it for sure. It can be repaired but they do have to take the front cap off to do it! Keep us informed on what you find out!
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04-08-2015, 05:51 AM
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#8
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Montana Master
Join Date: Nov 2004
Location: Arnold
Posts: 1,200
M.O.C. #2586
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Been there. Done that, w/our 2005 2955RL. Clearance of the rig to the truck way less. Check the king pin-frame welds w/a flashlight, or get to a dealer ASAP. Our main box beam across the front, to which the king pin mount was welded, sheard inside the cap. Entire mounting frame had to be cut out and rebuilt/welded by a Lippert tech. Don't push your luck. Get help now, as others have said. Front cap off will reveal the real situation. Good luck.
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