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#1
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Help with old Shimano Deore XT Front Derailleur
Hi all:
My daughter bought an old Cannondale Mtn. bike (7 cog rear cluster) and brought it home expecting me to put it to right. It has Shimano Deore XT components. I'm having difficulty getting the front derailleur set properly and wonder if I've screwed something up. Maybe somebody can give me an assist. This particular derailleur has a clamp set up that I'm not familiar with. The clamp itself is a C-shaped piece of spring steel whose ends go into the derailleur body. In removing the derailleur I kind of let things "explode" over the garage; I THINK I found all the parts and I THINK I've got them assembled correctly, but the derailleur keeps sliding down the seat tube even though I've cranked down the bolt pretty damn hard, so it seems like maybe it isn't correct after all. The order of assembly of the pieces is: bolt is placed in derailleur body from the right side; next, a short coil spring is slid over the bolt threads from the left side , then a small silver washer; finally, a cross-shaped nut is started on the threads; the C-shaped clamp is placed on the seat tube and the ends are pressed into the derailleur body. The two ends of the C-shaped clamp have slots that fit over two ends of the cross-shaped nut and as I tighten down the bolt the nut draws the clamp into the derailleur body. At least, that's the theory I'm working under. But, as I said, even though I'm tightening the bolt about as snug as I dare, and the derailleur seems to be pretty solidly attached to the frame, working the derailleur results in the derailleur sliding down the seat post. Can anybody tell me if I'm missing a piece, have the order of assembly wrong, or can point me to an exploded diagram of this derailleur so I can see what I'm doing wrong here? TIA. Tom Young |
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#2
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Help with old Shimano Deore XT Front Derailleur
Ouch! I've had that "explosion" happen unexpectedly when working on
various vehicles and bicycles--the subsequent hands-and-knees hour in the garage is not the most fun. Hopefully somebody more familiar with that exact model will have an answer. For the rest of us keyboard speculators, a photo would be most welcome for seluthing. Most clamp-on derailleurs are pretty straight forward and don't require fierce torque to stay put. |
#3
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Help with old Shimano Deore XT Front Derailleur
TomYoung wrote:
Hi all: My daughter bought an old Cannondale Mtn. bike (7 cog rear cluster) and brought it home expecting me to put it to right. It has Shimano Deore XT components. I'm having difficulty getting the front derailleur set properly and wonder if I've screwed something up. Maybe somebody can give me an assist. This particular derailleur has a clamp set up that I'm not familiar with. The clamp itself is a C-shaped piece of spring steel whose ends go into the derailleur body. In removing the derailleur I kind of let things "explode" over the garage; I THINK I found all the parts and I THINK I've got them assembled correctly, but the derailleur keeps sliding down the seat tube even though I've cranked down the bolt pretty damn hard, so it seems like maybe it isn't correct after all. The order of assembly of the pieces is: bolt is placed in derailleur body from the right side; next, a short coil spring is slid over the bolt threads from the left side , then a small silver washer; finally, a cross-shaped nut is started on the threads; the C-shaped clamp is placed on the seat tube and the ends are pressed into the derailleur body. washer first, then the spring I think. Makes assembly easier, doesn't affect clamping The two ends of the C-shaped clamp have slots that fit over two ends of the cross-shaped nut and as I tighten down the bolt the nut draws the clamp into the derailleur body. At least, that's the theory I'm working under. correct. Try reversing the cross shaped nut, the stamping has a high and a low side But, as I said, even though I'm tightening the bolt about as snug as I dare, and the derailleur seems to be pretty solidly attached to the frame, working the derailleur results in the derailleur sliding down the seat post. Can anybody tell me if I'm missing a piece, No you did well have the order of assembly wrong, or can point me to an exploded diagram of this derailleur so I can see what I'm doing wrong here? Make sure the cross nut engages with both ends of the band You might resort to some tape under the clamp -- --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
#4
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Help with old Shimano Deore XT Front Derailleur
TomYoung wrote:
Hi all: My daughter bought an old Cannondale Mtn. bike (7 cog rear cluster) and brought it home expecting me to put it to right. It has Shimano Deore XT components. I'm having difficulty getting the front derailleur set properly and wonder if I've screwed something up. Maybe somebody can give me an assist. New front derailers are very cheap and compatibility isn't too hard to work out, I wouldn't waste a lot of time on it. |
#5
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Help with old Shimano Deore XT Front Derailleur
Diagrams of all Shimano components are available on the Shimano web
site. You might download the appropriate one and check yours against it. |
#6
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Help with old Shimano Deore XT Front Derailleur
Marten:
Thanks for the input. It does seem to me that the problem does come down to the orientation of the nut, as I'm certain (well, as certain as I can be in the situation) that the ends of the nut are both engaged in the band. So... The nut has one face that's fairly smooth, glossy black, edges gently rounded. The other face has more "square" endges and isn't as smooth and glossy. Two ends of the cross - opposite one another - are shorter than the other ends and these shorter ends are slightly bent towards the non-glossy, non-smooth face of the nut. The longer ends of the cross are longer than the other pair because they have short tangs that project past what otherwise would be the square ends of their arms. It looks to me that the longer ends, the ones with the tangs, go into the derailleur body vertically, with the tangs riding in groves in the body; this prevents the nut from spinning in the body while things are in the process of being tightened down. The two short ends of the cross look to be the ones to engage the clamp slots as their slight bend towards the open end of the "C" provides a firm engagement with the slots. If I switch the orientation of the cross nut such that the short ends are vertical and the long ends are horizontal, the short ends don't engage the groves in the body and the length of the pair of long arms prevents the nut from being pulled very far into the body. If you agree that my orientation of the nut is correct, perhaps I'm not getting the proper engagement of the nut to the band. Thanks. Tom Young |
#7
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Help with old Shimano Deore XT Front Derailleur
Ok, I got it right, finally. The problem really was that the band
*wasn't* engaging the ends of the cross nut correctly. It appears that you really have to push hard on the derailleur to seat the clamp properly in the derailleur body. Having done that, the band pulled down just fine and the derailleur has stopped moving around. Thanks to all that responded. Tom Young |
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