Reader Alesu has kindly provided translations from German of technical documents about DG-7 series hubs including rebuilding isntructions for a couple of additional ones. Links in the list below will take you to these documents. Did you go too far when tearing down a hub? This site also includes information from reader Keith Lang on how to rebuild the axle unit of the 7-speed hub. Replacement parts availability is a concern, and so you may have to substitute an internal assembly from a different model.
The internal mechanism of these hubs is complicated, and the usual repair is to replace it in its entirety. It can usually be replaced with a newer version as long as the hub is of the same basic type with or without coaster brake and in the same series. The right-hand hub bearing cup of these hubs is vulnerable water contamination. Better lubrication is recommended to forestall this problem and to make cleaning and rebuilding easier.
Most parts lists include some compatibility information, and many are formatted similarly so that you can compare them visually like an astronomer looking at two sky photos in a "blink comparison" when searching for an exploding star or an asteroid.
In some cases, it is possible to convert an existing bicycle to use a Nexus hub. I have a very nice 's Raleigh Competition racing frame which I have converted into a Nexus 7-speed. Sheldon Brown's Nexus Raleigh Competition. My Peugeot "PX-7" has time-trial style " cowhorn " bars, which are a lot like the bottom part of drop bars. The usual orientation for the RapidFire shifter is on the right, hanging below straight bars, where it may easily be operated by the right thumb.
The cable runs inward parallel to the bar. On my Peugeot, I have it on the left side, clamped to the bar just below the brake lever, where it it very convenient to be operated by my left thumb. The cable runs downward, making a neat run toward the down tube of the frame. This works quite well for me. I have a separate page about this bike, with pictures. Reports of the demise of this Web site are greatly exaggerated! We at sheldonbrown. Harris Cyclery has closed, but we keep going.
Keep visiting the site for new and updated articles, and news about possible new affilations. The Shimano Nexus 7-Speed Hub. Nexus is a family of parts, of which the Nexus Inter 7 seven speed hub is one. My initial impression on actually using one was extremely favorable. I particularly like the RapidFire control unit, which is very easy to use and has a very light touch. I also am pleased at how well-protected the linkage to the hub is. This hub uses a rotating ring operated by the cable, inboard of the chainstay.
Brake arm unit Ball retainer B Remove the hub shell. Hub shell Internal assembly Now it can be replaced with the new internal assembly. Disassembly and assembly can be carried out quickly. Page 4 Remove the stop ring with a screwdriver. At this time, the stop ring come off with great force. Be careful of the safety using cloth and so on.
Screwdriver Stop ring Remove ring gear unit 2 and After removing them at the same carrier unit 2 at the same time time, remove carrier unit 2 from while turning ring gear unit Page 5 Remove ring gear unit 1 while turning it slightly to the left and right. Ring gear unit 1 Remove ball retainer H while pressing in pawl C on the driver and axle unit with a screwdriver. Be careful not to bend ball Pawl C retainer H. Page 6 Assembly of the Inter-7 hub Hold the two bevelled surfaces of the hub axle on the sprocket side in a vice.
Note: Do not damage the threads of the hub axle. Vice Note: Install ball retainer H while Be careful of the pressing in pawl C on the setting direction. Page 7 Engage the teeth of the planet Note: pinion in carrier unit 1 with Apply a liberal coating of internal the teeth of ring gear unit 1, hub grease to the planet pinions and then press in ring gear 3 places in carrier unit 1. Page 8 Note: Engage the teeth of the planet Apply a liberal coating of internal pinion in carrier unit 2 with hub grease to the teeth of the teeth of ring gear unit 2 the planet pinion 3 places in while turning carrier unit 2 carrier unit 2.
Page 9 Note: Place ball retainer B onto Be careful of the setting the hub shell. Apply a liberal coating of internal hub grease.
0コメント