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Cone bearings
I recently acquired a shimano mountain bike. I've replaced the bottom
bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. TIA Steve |
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#2
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Cone bearings
shazzbat wrote:
I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. traditional threaded hubs look like this: http://www.yellowjersey.org/photosfr...t/MAILLARD.JPG The freewheel removes completely cassettes something like this: http://www.yellowjersey.org/photosfr...t/CANEWHUB.JPG or http://bernd.sluka.de/Fahrrad/Shiman...0-7QR_1995.gif the ratchet assembly is part of the hub, the sprockets slide off. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 ** Posted from http://www.teranews.com ** |
#3
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Cone bearings
"A Muzi" wrote in message ... shazzbat wrote: I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. Many thanks for that. I think there may be both a cup problem and a missing dust seal. Mine is more like the one here - http://bernd.sluka.de/Fahrrad/Shiman...0-6NT_1994.gif But even so there are a couple of differences, ie I appear to have no component 7, which my poor German suggests is a dust cap. Also I seem to have two of component 10, rather than one each of 8 and 10. I'll go out and take a couple of pics in the morning, and see what can be sorted out. Thanks again Steve |
#4
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Cone bearings
"shazzbat" wrote in message ... "A Muzi" wrote in message ... shazzbat wrote: I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. Many thanks for that. I think there may be both a cup problem and a missing dust seal. Mine is more like the one here - http://bernd.sluka.de/Fahrrad/Shiman...0-6NT_1994.gif Right, I've put some pics here - http://s163.photobucket.com/albums/t.../bike%20stuff/ I'm now not convinced that the cup for the bearings is there, there's certainly far too much room for the balls and the cone. Steve |
#5
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Cone bearings
shazzbat wrote:
http://s163.photobucket.com/albums/t.../bike%20stuff/ I'm now not convinced that the cup for the bearings is there, there's certainly far too much room for the balls and the cone. Remove the freewheel (Shimano) and all will become clear -- /Marten info(apestaartje)m-gineering(punt)nl |
#6
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Cone bearings
shazzbat wrote:
I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. "A Muzi" wrote Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. "shazzbat" wrote Many thanks for that. I think there may be both a cup problem and a missing dust seal. Mine is more like the one here - http://bernd.sluka.de/Fahrrad/Shiman...0-6NT_1994.gif shazzbat wrote: Right, I've put some pics here - http://s163.photobucket.com/albums/t.../bike%20stuff/ I'm now not convinced that the cup for the bearings is there, there's certainly far too much room for the balls and the cone. Yes, that's a UG freewheel. The removal tools is cheap and ubiquitous but get a service manual! (online or dead trees, whatever). We can't see any detail on the cones (you should look closely) and you can't see the right side cup yet. There's no indication yet that anything is awry. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 ** Posted from http://www.teranews.com ** |
#7
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Cone bearings
"A Muzi" wrote in message ... shazzbat wrote: I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. "A Muzi" wrote Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. "shazzbat" wrote Many thanks for that. I think there may be both a cup problem and a missing dust seal. Mine is more like the one here - http://bernd.sluka.de/Fahrrad/Shiman...0-6NT_1994.gif shazzbat wrote: Right, I've put some pics here - http://s163.photobucket.com/albums/t.../bike%20stuff/ I'm now not convinced that the cup for the bearings is there, there's certainly far too much room for the balls and the cone. Yes, that's a UG freewheel. The removal tools is cheap and ubiquitous but get a service manual! (online or dead trees, whatever). We can't see any detail on the cones (you should look closely) and you can't see the right side cup yet. There's no indication yet that anything is awry. Something is definitely wrong. Today I put 9 balls in, poking them through the freewheel with a finger, and sticking them in place with grease. Then I reversed the cone on the spindle to put it in blunt end first, and it sits inside the ring of balls. I'm going to the bike shop tomorrow to get the spindle and cones, so I'll take the wheel with me to see what they say. Could it be relevant that whereas the freewheel is marked "shimano Singapore", but on the other side the outer surface of the cup is marked "grimeca Italy"? And could it be the case that the freewheel side needs larger balls than the other side? Steve |
#8
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Cone bearings
shazzbat wrote:
I recently acquired a shimano mountain bike. I've replaced the bottom bracket and it's bearings and now turned my attention to the rear wheel which had a lot of play in it. It's a 26" wheel and has a set of 6 sprockets attached. Removing the spindle, I found it to be deeply scored and the cone on the sprocket side badly mangled. Getting a new spindle and cones isn't a problem, but it seems to me there's probably something missing from the set-up, as there's a big gap between the cone and the housing, so even when I refit the spindle, cone and bearing balls, it's not going to take up the play. When I took it apart, the balls were around the outside with enough room for the cone to pass right through. Is there somewhere I could check out a diagram online to see what's missing? And how is the group of sprockets removed? Not that I need to right now, but I'd like to know for future reference. "A Muzi" wrote Most probably a freewheel hub, although possibly a cassette system. Either would have a cracked or eroded right side dust cap if it was ridden much with a bearing problem. Freewheels remove with a tool which holds the inner body and are specific to the freewheel model. Cassettes of that era disassemble by unscrewing the small gear. Either a more thorough description or a consultation with a competent LBS would be helpful. Do clean and inspect the cup inside the hub before going much farther. If it was ridden loose for a while you may have damage there, the bearing diameter being much larger after the cup erodes or cracks. I couldn't tell from your description if it was a bearing cup problem or a missing dust seal. "shazzbat" wrote Many thanks for that. I think there may be both a cup problem and a missing dust seal. Mine is more like the one here - http://bernd.sluka.de/Fahrrad/Shiman...0-6NT_1994.gif shazzbat wrote: Right, I've put some pics here - http://s163.photobucket.com/albums/t.../bike%20stuff/ I'm now not convinced that the cup for the bearings is there, there's certainly far too much room for the balls and the cone. "A Muzi" wrote Yes, that's a UG freewheel. The removal tools is cheap and ubiquitous but get a service manual! (online or dead trees, whatever). We can't see any detail on the cones (you should look closely) and you can't see the right side cup yet. There's no indication yet that anything is awry. shazzbat wrote: Something is definitely wrong. Today I put 9 balls in, poking them through the freewheel with a finger, and sticking them in place with grease. Then I reversed the cone on the spindle to put it in blunt end first, and it sits inside the ring of balls. I'm going to the bike shop tomorrow to get the spindle and cones, so I'll take the wheel with me to see what they say. Could it be relevant that whereas the freewheel is marked "shimano Singapore", but on the other side the outer surface of the cup is marked "grimeca Italy"? And could it be the case that the freewheel side needs larger balls than the other side? You can't adequately clean the right side cup, nor inspect it, without getting the freewheel out of the way. Do that first. Whether your freewheel was made in Singapore or made in Osaka or made in Milano is irrelevant. Remove it from the hub before you proceed. Grimeca makes moped brakes. ?? -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 ** Posted from http://www.teranews.com ** |
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