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Shock mount failure - Printable Version +- Wanderlodge Gurus - The Member Funded Wanderlodge Forum (http://www.wanderlodgegurus.com) +-- Forum: Yahoo Groups Archive (/forumdisplay.php?fid=61) +--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63) +--- Thread: Shock mount failure (/showthread.php?tid=7690) |
Shock mount failure - david brady - 02-20-2009 05:00 I guess as long as the gussets are 120 deg apart they will always sum to an equivalent of one in tension and an equivalent of one in compression regardless of the direction of the incident force (assuming it's perpendicular to the stud). Are they 120 deg apart on the WB? David '02 LXi, NC david brady wrote:
Shock mount failure - Don Bradner - 02-20-2009 05:19 I can't find a photo that shows the angle definitively, but I believe they are 120. None exactly along the axis of the shock. On 2/20/2009 at 12:00 PM david brady wrote: >I guess as long as the gussets are 120 deg apart they will >always sum to an equivalent of one in tension and an >equivalent of one in compression regardless of the >direction of the incident force (assuming it's perpendicular >to the stud). Are they 120 deg apart on the WB? > >David >'02 LXi, NC Don Bradner 90 PT40 "Blue Thunder" My location: http://www.bbirdmaps.com/user2.cfm?user=1 Shock mount failure - Jon - 02-20-2009 06:20 --- In WanderlodgeForum@yahoogroups.com, "Don Bradner" > > I can't find a photo that shows the angle definitively, but I believe they are 120. None exactly along the axis of the shock. > > On 2/20/2009 at 12:00 PM david brady wrote: > > >I guess as long as the gussets are 120 deg apart they will > >always sum to an equivalent of one in tension and an > >equivalent of one in compression regardless of the > >direction of the incident force (assuming it's perpendicular > >to the stud). Are they 120 deg apart on the WB? > > > >David > >'02 LXi, NC > > Don Bradner > 90 PT40 "Blue Thunder" > My location: http://www.bbirdmaps.com/user2.cfm?user=1 I have been following this post and I know most people wouldn't know a gusset from a pineapple and this kind of scares me. When folks pay out a hundred thousand dollars for a Wanderlodge they must expect that there buying a machine that will go for hundreds of thousand of miles without a major problems. Kind of makes our older Wanderlodges look a little bit better as I have never heard of this type of problem with them. Oh well I just hope if I ever get enough cash to buy up to a newer model that this gusset problem won't happen to me but what a pain in the butt to keep on thinking about while going down the road. Jon > Shock mount failure - timvasqz - 02-20-2009 17:35 Jon, it is not a big problem. It is more of a forseen issue now that the members have recorded reoccurance. most of what is posted is theory followed by an explanation to support a theory in the hopes that we find truth. I looked at my 94ptwb today and there are no cracks in the welds. I believe when it cracks then tears it takes time as evident by Dons photo showing old rust at the crack then fresh cut at the tear. Had the shock installer been alerted to the problem area, I believe Don could have gouged out the crack and run a bead weld in the crevice ($100). The service here is a reminder to check the failure prone area. My dump truck is checked several times a year by DOT inspectors so I look over the underside real good to keep from being redtaged roadside. . Never has a year gone by that a suspension component was not replaces due to wear or failure. the million mile engine wives-tale fails to credit the quarter million dollars of maintenance/repair during those miles. we here seek to reduce that 250K. Greg ofTim&Greg 94ptca > > I have been following this post and I know most people wouldn't know > a gusset from a pineapple and this kind of scares me. When folks pay > out a hundred thousand dollars for a Wanderlodge they must expect > that there buying a machine that will go for hundreds of thousand of > miles without a major problems. > > Kind of makes our older Wanderlodges look a little bit better as I > have never heard of this type of problem with them. > > Oh well I just hope if I ever get enough cash to buy up to a newer > model that this gusset problem won't happen to me but what a pain in > the butt to keep on thinking about while going down the road. Jon > > > Shock mount failure - Don Bradner - 03-09-2009 12:10 I got the bus back today with the shock mount repaired - also had a leaking drive axle seal replaced, generator serviced, etc. Original damage: http://www.arcatapet.net/image/shockmount.jpg Repaired: http://www.arcatapet.net/image/shockrepair.jpg As you can see, they took a substantially different repair route than was used on Pete's. Don Bradner 90 PT40 "Blue Thunder" My location: http://www.bbirdmaps.com/user2.cfm?user=1 Shock mount failure - Pete Masterson - 03-09-2009 13:59 That's a very nice, clean-looking repair. I suspect that the bent, torn piecefrom the base platemight have pushed them in that direction. CCW had a press that they used to flatten it in about 10 seconds -- but it's not the kind of tool I'd expect to see in most shops. It's impressive how much alike the before image was to mine...
Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 (For Sale) El Sobrante CA "aeonix1@mac.com" On Mar 9, 2009, at 4:10 PM, Don Bradner wrote:
Shock mount failure - Eric Perplies - 03-09-2009 15:22 My front left shock mount broke just before the Q rally in 08. CCW in Riverside fixed mine shortly after the Q rally. On my coach the shock mount ripped out a chunk of metal on the frame. A piece of steel about 1/2" x 8" x 6" was welded onto my frame. A hole was drilled in it to accommodate the brake air line. The original shock mount with it's three gussets were removed from the broken out piece. That original shock mount was then welded back onto the 1/2" plate mentioned above. The welds made during the repair were VERY thorough. There was an indication that the original BB welds may not have been as through as they could have been. (One side of one of the gussets had not been welded onto the frame.) That having been said this could not be the reason for the failure. After all the frame on my coach had a section ripped out of it. The shock mount itself did not fail. A far more interesting question is: What causes the failures on the shock mounts? Shock mount failure - Don Bradner - 03-09-2009 15:40 Did your tear look at all like mine (mine looks almost exactly like Pete's)? Presumption is that the slamming downward when the wheel bottoms into a pothole or similar is the issue. Countless slams, and the metal gives way. Note that it is not the frame, but rather the steel mounted to the frame - that steel is a part of the axle assembly and was presumably not welded by BB. The repair done on mine comes close to matching the original assembly, making it possible/likely that sometime in the next 20 years it will fail again. I'm going to try to remember to stick a camera in there for photos every few months (more often to begin with!) that it is driven. On 3/10/2009 at 2:22 AM Eric Perplies wrote: >My front left shock mount broke just before the Q rally in 08. CCW in >Riverside fixed mine shortly after the Q rally. On my coach the shock >mount ripped out a chunk of metal on the frame. A piece of steel about >1/2" x 8" x 6" was welded onto my frame. A hole was drilled in it to >accommodate the brake air line. The original shock mount with it's three >gussets were removed from the broken out piece. That original shock mount >was then welded back onto the 1/2" plate mentioned above. > >The welds made during the repair were VERY thorough. There was an >indication that the original BB welds may not have been as through as they >could have been. (One side of one of the gussets had not been welded onto >the frame.) That having been said this could not be the reason for the >failure. After all the frame on my coach had a section ripped out of it. >The shock mount itself did not fail. > >A far more interesting question is: What causes the failures on the shock >mounts? Shock mount failure - Pete Masterson - 03-10-2009 06:20 There is a sub-frame that holds the shock mount, air bag, and other parts of the front end. It's a piece that's about 24 to 30 inches long. That piece comes from Ridewell. (Although Ridewell might claim that Blue Bird provided the specification.)The speculation is that the Ridewell piece is not thick enough (or otherwise not sufficiently strong) to take the constant hammering. Awhile back on one or the other WL lists, someone reported that lowering the leveling jacks with the suspension still aired up puts an unusually large stress on the front shocks and mounts. That may start the weakening process. However, I know that it was rare for me to forget to dump the suspension before I leveled the coach. Before the complete failure of my shock mount, I'd noticed a 'popping' noise in the front end when encountering theporpoisingmovement that occurs after passing over one of the multitude of ground subsidence undulations that are frequently found on the freeways, especially in the SF Bay Area where the highways are frequently built on fill (near the bay) or unstable clay soils (nearly everywhere else in the area). Later I realized that the noise was cause by the flexing of the split (and eventually broken) piece of the Ridewell sub-assembly. (The acoustics caused it to sound like it came from the opposite side.)
Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 (For Sale) El Sobrante CA "aeonix1@mac.com" On Mar 9, 2009, at 7:40 PM, Don Bradner wrote:
Shock mount failure - Dan Williams - 03-10-2009 08:30 Pete, I may be getting in on this Dan Williams, 88WB38, Jackson, MS From: WanderlodgeForum@yahoogroups.com There is a sub-frame that holds the shock mount, air bag, and other parts of the front end. It's a piece that's about 24 to 30 inches long. That piece comes from Ridewell. (Although Ridewell might claim that Blue Bird provided the specification. thick enough (or otherwise not sufficiently strong) to take the constant hammering. Awhile back on one or the other WL lists, someone reported that Before the complete failure of my shock mount, I'd noticed a 'popping' Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 (For El Sobrante CA "aeonix1@mac.com" On Mar 9, 2009, at 7:40 PM, Don Bradner wrote:
Did your tear look at all like mine (mine looks almost exactly like My front left shock mount broke just before the Q rally in 08.
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