Shimano Nexus 8 Speed Hub Reassembly - Putting It Back Together...

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I was challenged by my viewers to try to re-assemble the Shimano Nexus 8 Speed Hub that I disassembled in my last video. The hub is a Shimano Nexus SG-8R20. Fortunately, I had my video of taking the hub apart, which helped me in figuring out how to put it back together again.
Shimano Nexus 8 Speed Hub - Dissection! Evisceration! Destruction!:
• Shimano Nexus 8 Speed ...
Here is the Shimano service manual:
si.shimano.com/pdfs/dm/DM-SG0...
For assembling the shift spring assembly, this video by Dan Burkhart was greatly helpful:
Shimano Alfine shift spring overhaul
• Shimano Alfine shift s...
* editing goof at 16:55 to 18:34 with one clip, and then a reshot version of the same clip. I redid it because I thought I could show it better. A little peek behind the curtain of shooting one of these videos.
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Опубликовано:

8 фев 2019

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Комментарии : 338

@RJTheBikeGuy 5 лет назад

For more bike repair videos hit the subscribe button ► bit.ly/SubRJTheBikeGuy

@MrSlava59 5 лет назад

Подписался на Ваш классный канал !Большое Вам спасибо за интересные и нужные видео пояснения !!!

@2L40K 4 года назад

9:05 - the spring does not sit correctly. It must be completely symmetrical, no skew allowed. Here is an old old video on Inter 8: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-H7JqCCkhSUU.html

@PiotrK2022 3 года назад

Next time... Google.com-> Shimano Nexus (model name) service manual and you everything from A up to Z including which one grease and where...

@robertkat 2 года назад

You only do that if the parts are free and your time is worth nothing. No warranty for this job.

@billd6565 4 года назад

As a Merchant Marine Engineer for more than two decades I’ve overhauled all manner of complex machinery (motors, pumps, purifiers, valves...) but this really challenges your attention to precise assembly. I watched you take this apart, and I was reminded of the old engineering saying that “assembly is never the reverse of disassembly”. Anyone can take stuff apart. Putting it back together is always the challenge. Bravo RJ, I could have used you on the ship.

@mangoie 5 лет назад

Hey RJ. I had a shifting problem with my Nexus 8, so I found this vid while I was looking for a possible solution. Thanks for such this detailed video, I learned a lot!

@misterfive5520 4 года назад

Such a detailed and comprehensive comment yet no more than a 'heart' comment reply. People way too busy nowadays if you ain't bringing value to them.

@bozhidarvorukov7348 4 года назад

Yes is roller clutch like one on fly reels or fishing reels. If you reverse the clutch you transfer the fly reel from right hand to left hand. the diagram si.shimano.com/pdfs/ev/EV-SG-8R20-2236G.pdf

@neilbain8736 4 года назад

@@bozhidarvorukov7348 This pdf is really useful!

@dudeonbike800 4 года назад

Roller or sprag clutch. Too much grease shouldn't be a problem. The accumulated rust on the bearing retainer and perhaps other places might be the culprit.

@LTPottenger 4 года назад

Great to hear, I have always thought of getting one of these.

@AntonBabiy 5 лет назад

I find it amazing how they design these things! So complicated

@RGV2300 5 лет назад

Indeed, they take epicicloidal gearsets found in automatic transmissions to a bike, i freaked out the first time i saw this.

@Za7a7aZ 4 года назад

Gears...thats for autistic avants to design I think. Have you ever seen how they design the gears for watches...with those special challenges..what do they call it again... Anyways...with simulation software it is much more easier to design very complicated small mechanics...

@wongjock648 4 года назад

Yes indeed. Crazy skilled Japanese people just going hard on quality engineering and design.

@PiotrK2022 3 года назад

Yeah complicated as fuck.... Without knowing assembly procedure there's no chance to get it working back after disassembly.

@055_rickysuryapranata6 2 года назад

yet so cheap

@josjetwentytwo1540 3 месяца назад

I really enjoyed watching. Two years ago I fucked up a very dirty shimano 3 speed hub from my sons bike. I thought, well I can do this! I Watched reassembling videos but at the end it diden't work. Finally I bought a 2nd hand inner work for less and finished the job. Could not sleep for 2 nights, felt very disappointed in my skills. Your video reminds me about that my struggeling moments with the shimano hub. BUT, I really got BIG respect for the engineers who invented these hubs with so much parts, all designed with a purpose and all work together. Me myself, I am am audio/video composer but when I got a BMW R60/5 (1971)from my dad 15 years ago, I started to appriciate the wonderfull world of mechanical enginering. Great Video !!!

@davidrjamieson 3 года назад

Thank you for the detailed video. I was able to fix mine after many attempts. The second spring insert is the trickiest part, and it is what was wrong with mine. The spring has to be inside the upper flange tabs, and outside the lower flange tabs after you tighten it one turn, but it does not want to do that! Several times I thought I had it, but I couldn't get both sets of four gears to work. Upon inspection, I could see the spring was crunched up in the space, but not properly, so the mechanism that gave you the second set of gears was not moving properly. Finally, I had to ask my wife to help, and with four hands available, we got it in correctly, and now it works. Thank you!

@rewind1961 3 месяца назад

Thanks for another great video. I obtained a Nexus hub for just about free but was it frozen and rusted. I took a little apart, and got it shifting, but the pawls would not engage. More disassembly and eventually all working good. Your video was the best on RU-vid with careful and clear explanation of the assembly. This was probably the most complicated assembly I have ever performed and would of never got it completed without your detailed video. Thanks, RJ!

@Antje-Pikantje 5 лет назад

I enjoy repairing stuff on my bikes because they are always very simple mechanical things. This thing however is just unbelievably complicated. Thanks for showing how to take it apart and back together. Even if it still won't work properly, you are my personal hero!

@jurikristjouw 6 месяцев назад

it just needs one more spring and clip to be a nuclear bomb... dear lord... After this, I can rebuild the manual gearbox of my car in a heartbeat...

@brindlebot 4 года назад

Really appreciated this vid for my Nexus 8 service. More parts than I thought which would have been impossible to put back together without this video.

@Heleninhalinda176 5 лет назад

Man, as a cyclist and bike mechanic I absolutely love ur vids. I very very rarely enjoy any RU-vid video longer than 20 mins, but you 40min+ vida makes me thrive

@ralphievelasquez9985 5 лет назад

Great deal of knowledge... patience and integrity..RJ you are a very smart man.

@edriley6739 5 лет назад

the complexity of this hub is a-pawling and your stick-to-it-tive-ness to be applauded. keep at it. get those pawls aworking and astonish us

@nickandersonco 4 года назад

In the first video you didn't have a clue what you were looking at, now you have all the tools and can do the majority of maintenance on those, as well as a decent amount of troubleshooting. Very impressive and inspiring to watch. Thanks again!

@slideman. 5 лет назад

What an amazing piece of machinery! Thanks RJ! That's why I keep coming back to watch your videos! great job!

@MrBlurry2011 4 года назад

you where so close, I stumbled on this and got hooked. Never knew these existed, now I can see how they work. Pretty awesome device. Thank you.

@100rogerduncan 5 лет назад

Thanks for the great video. THE PAWLS ARE WORKING FINE! They don't get pulled down! They just get overridden by the shell because it moves faster in higher gears so the lower gear pawls just slide underneath while the correct pawl grips. I think if you tried this hub it would work fine!

@TopseyKretts 5 лет назад

..Man..that was impressive!......awesome work R.J..

@MrLuigi-oi7gm 5 лет назад

That was the most suspenseful video/movie I have ever watched! Will RJ succeed? Will be not? You did it!!! Take a huge bow RJ! That was so interesting. Can't wait for the sequel where you do battle with those stubborn prawls!

@diavalus 5 лет назад

6 months ago, I tried to service the same hub. Guess what, I've had the same issue and I gave up after a while. Anyway, cheers for your effort of putting everything back together!

@01FozzyS 5 лет назад

Now you're an authorized Shimano IGH mechanic. LOL! Nice job RJ!

@Francois_Dupont 3 года назад

actually no, he didnt fix it.

@johnburton9156 5 лет назад

If anyone can do it RJ definitely can. RJ you're the man love the videos keep them coming

@sitflyer2661 5 лет назад

and they said nobody could put Humpty Dumpty back together again! Well done!

@adrianharding1843 3 месяца назад

Great video RJ. I was a bike mechanic when I was younger. When one of these things showed up at the shop it really separated the guys that thought they knew (me) from the very very few that did. Your video was a great aid to me while servicing a nexus 8 with lots of drag. Thank you for putting this together.

@saqrsalem186 5 лет назад

RJ you are the best as always👍

@sunfirefilms 4 года назад

whipped out the popcorn and enjoyed watching the job that I will never ever do. You rock RJ

@recstoppauseplay 9 месяцев назад

Fantastic work RJ! I couldn't stop watching how this transmission (basically what it is) goes back together and how it works. I thought I had the 3 speed Sturmey Archer down then this comes along and .. wow.

@normandgallant8106 2 года назад

Well done and thanks for your time ......my shimano 8 is still functionning great . The chain fell on the shifting cassette , replaced and all is ok . Replaced cog with a cog with a chain guard , it's needed along with a chain tensionner . I use the nexus 8 on a heavy tandem trike with long chains that are now enclosed in tubes so my chain won't come off on rough roads ....when I opened my hub the grease looked great and I added a bit more shimano grease but my hub did not look like it was oiled . This is the first time I've the oil .

@JohnD666 3 года назад

Hey RJ, thaks for posting this. The detailed vid just made my day, when i botched 'fixing' a Nexus 8 hub.

@Daniel-uo5lm Месяц назад

To me it looks like either the tabs on the turning thing that push down the pawls, or the parts of the pawls that get pushed down are worn out, which causes them to stay up too much. I guess the grime and sand that was in there before might've done that damage. Amazing job on reassembly and explaining all the workings of the hub at the end!

@keithschrack 5 лет назад

My kinda guy! The service manuals for SG-8R20 are available through Sheldon Brown's page, but I'm guessing you already knew that. The axle group (with pawls) appears to be a lowest replaceable assembly.

@OjStudios 5 лет назад

Not a suprise it costs a small fortune to get one of these fixed at a store. Nice job getting this back together! I know it's not easy, I've done one with 7 gears and it's a real PITA.

@classydays43 4 года назад

Kudos to whomever designed this thing, but rebuilding one deserves a beer

@villetta3705 2 года назад

Amazing understanding for machinery,mechanism and gadget! There’s no mentor about bicycle mechanism like you in Japan , though SHIMANO is made in our nation Japan😭 Thank you so much indeed. May god bless your hand and soul. Domo Arigatou❗️

@keeanmorishita8457 5 лет назад

I am amazed at your determination. You have inspired me to take apart one of these Nexus 8 myself! the model I have to try with is one generation newer than the one you have I believe? It is an 8 speed but some of the ring clips seem a bit different. Either way I have had shifting issues such as slipping gears regardless of cable adjustment. Numerous Nexus 8 have had gear 5 fail and I wonder if it has to do with the clutch engagement you showed. Thank you so much RJ. You are my favorite RU-vid bike mechanic

@dennisolsson3119 4 года назад

7 speed looks similar, but note that the cog wheel looking plate at 13:30 has an outside and inside and the shift arm will not fit if this plate is turned wrong. That was the case for the 7 gear hub. Thank you for the video! You saved a life today... The life of my wife's bicycle :)

@davidcollishaw2771 3 года назад

Blimey this Was a hard video to watch as some of the assembly seemed to run backwards, but I managed it after a service went wrong and I managed to jam it in gear by separating a spring and tab right down deep inside. I've never wound a vid back so much so thank you for this one.

@imawrench 5 лет назад

Well done Dr. Science, I mean RJ. I have a had a couple of these hubs apart, same situation, "something" not functioning properly. Very informative video, thank you for sharing it. Be well, Stephen

@ligmuhnugs Год назад

This is the best video out there showing one of these gearboxes going together. I have a nexus 7 speed that won't shift to 1st or 2nd gear.

@storlach 4 года назад

You, Sir, just saved -well not my live - but my wife's bike! Thank you so much for this perfect video!!

@XxXnonameAsDXxX 5 лет назад

Actual madman assembled it back! respect

@yasiryw1177 5 лет назад

That was coooooooool These hubs are really cool and a wonderful piece of engineering, it looks like NASA stuff. Thanks man, you Rocks

@user-xi3vr1kh9u 5 месяцев назад

great respect its really unbelievable to get this thing together

@MrKfq269 5 лет назад

The inventor of that type of hub is an absolute genius. Its hard to believe that its all for a bicycle wheel.

@alexs8941 Год назад

Dude you are awesome! I was having the exact same probleme of standing in front of a complete disassembled hub and now i can piggyback of your video.

@jackreacher1963 2 года назад

Thanks for videos on these hubs I now can take them a part and rebuild them no problem.

@TheJoePavlik 5 лет назад

Shifting ring part was so cool seeing the guts and pawls move.

@rajkins2k 4 года назад

i love how you re did ~min 16 - 19 as your part and demonstration went off-screen in the first part -*Thumbs-up*

@hatsunemikussnzbmindcontro4444 5 лет назад

The parts inside 😮 Its mind blowing! ( And to fix ) 👍🏼 🙋🏼‍♀️

@Ricobass0 5 лет назад

looking forward to when you do get it figured out!

@tonyconnors1342 5 лет назад

Really enjoyable i knew you would make this video someday thank you love watching your videos very educational.

@SuperJerot 5 лет назад

Last time the word was "here", now it's "little". RJ The Lil Bike Guy. Glad you were up for the challenge for assembling this thing!

@BrandtRalf 2 года назад

Thank you that helped me a lot, when doing a big maintenace on my nexus intr 8 gear hub.

@Bikeops2021 5 лет назад

Great work RJ, very clever design work here hope you get it working correctly sometime.

@bb1039 3 года назад

best one so far on how it should work

@lingoflamingo622 2 года назад

Thx, this vid saved my day and my customers hub

@oldkins 5 лет назад

Wow, someone has been doing a bit of homework, Chrystal clear instructions RJ. Thank you.

@Geoffrey150 3 года назад

Crazy interesting!! Amazing video, thank you!

@truckertom3323 5 лет назад

There you go see, i knew you would get it done, Genius.

@bruceabe3139 5 лет назад

RJ you are a hero!...Standing O for you pal! I've always wanted to take one apart but have no time at the shop. This series of disassemble and re-assemble will come in handy one day. Thanks for sharing your knowledge.

@anthonyschmieder3174 5 лет назад

You have the patience of a saint!

@MrSlava59 5 лет назад

Большое Вам спасибо. За интересное ! Нужное !И очень понятное !Видео пояснение сборки Shimano Nexus 8 Speed

@fatihd.1792 2 года назад

the best bicycle mechanic.

@rb6951 4 года назад

Thanks RJ, thanks to your video I was able to repair my bike.

@thecrew257 4 года назад

Can I youse cooking oil ass Shimano oil?

@tinkerbilletjes 2 года назад

Hey RJ, thank you so much for this video. Used this together with other sources in order to repair/rebuild my Inter Nexus 4 - because I hadn't taken any pictures.. Unfortunately the hub is still broken although I can't see how/where, but it didn't shift anyway when I got it. Unfortunately also my rear wheel doesn't rotate with the chain any longer. I gave up after having taken the hub apart for the 12th time ;) (I can dismantle/reassemble it in my sleep). Thank you for the detailed videos on bike fixing!

@tinkerbilletjes 2 года назад

Got it working to shift to 1 and 4 one time, but the entire thing made and still makes an awful scraping noise when freewheeling...

@user-lm6hx2ti4g 4 года назад

It was very helpful to me. I appreciate it very much.

@darrengarvie8832 11 месяцев назад

Loved this video

@wodstalker2819 5 лет назад

Re assembly is even more impressive lol, goog job !

@leestimson12 5 лет назад

Absolutely amazing!!! I got thinking while you were working on the hub about the people who designed and engineered that whole mechanism and the mathematics needed and then to make all those little individual parts and...... I'm sticking to just repairing bikes. Much easier. But this was truly fascinating.

@yuukiokazaki3543 5 лет назад

OMG YOU DID IT!!! :D SUCH A LEGEND

@namdarbolour9890 4 месяца назад

At 17:30 I believe the part you call a "ring bearing" is actually a roller clutch (a silent freewheel implemented by those rollers riding up ramps). It is not a bearing, rather a one-way clutch, or freewheel. Great video, thanks.

@balloney2175 2 года назад

You were able to put it back cuz you are the inventor of that.

@LauriAP 5 лет назад

Shifter sleeve was the part operating the paws. There is something wrong, Maybe cleaning helps. You found out how to do it, assembling the nexus hub, Congratulations :) !

@kenken-ss7jn Год назад

Great work and info

@ZzulfadliNasir 5 лет назад

Thank you thank you and again thank you i wait this video for quite so long on how to overhaul this gear 💋❤️

@mikeypictures983 5 лет назад

wow.. I am so impressed by your mechanical skill! and also by shimano's tech. thank you for sharing this video!

@choobv2 4 года назад

Definitely still useful and all the more interesting because you didn’t contrive a happy ending for us. Real life. In a garage.

@marvinmartion1178 2 года назад

I watched the disassembly and would love to see it back together working! You do have film for reference, so

@GordoGambler 2 года назад

Perfect video RJ, the other Shimano ones are almost all Russian. I now have a Nexus 7i with a nice trigger shifter. Perfect gears for medium hills, city and highway. It came with 44/22T, too slow for me. Now going to try 18T. The stupid roller brake makes it way slower than my finicky shift SA XL-RD5w. This 5w IS the fastest hub I've ever had, done 46 mph on a 8% hill. But I want to tell everyone to not be so afraid of a little play in ANY bearings. The 7i came tight and so did every pedal I ever bought. The 7i coasts way farther now, it was worse than my Rohloff ever was. LOL.

@sterremonstar 2 года назад

Wauw, super to see, thank you!

@davepowell1521 5 лет назад

So interesting and very well explained and filmed!👍👍 5 dislikes why??? Your video does what it says on the tin.

@ericpatterson8596 5 лет назад

Great job you did !! Thank you 👍

@that70sschwinn 5 лет назад

I found it very interesting and was rooting for it to function once reassembled...nice demonstration just the same.

@mrmott44 2 года назад

Good video. I learned to rebuild these from the Russian video but it’s nice to see another viewpoint

@claudiotrentini7567 5 лет назад

16:55 start clip 1 17:50 end clip 1 17:50start clip 2 (is the same clip) 18:34 end clip 2

@RJTheBikeGuy 5 лет назад

Hehe Editing goof! I saw the first clip had the unit out of frame, so I reshot it, and apparently forgot to remove the first clip. A peek behind the curtain.

@spinaway 4 года назад

This just goes to prove the theory that if you can workout how something works you can repair it, well done and thanks for sharing.

@LLOPEZJF 3 года назад

amazing work !!

@BikeLifePinas 5 лет назад

Interesting and fascinating. Maybe more of these videos soon

@mitzij 3 года назад

Amazing video dude!! Simply amazing, just like a mechanical puzzle. I admire you for your patience getting all these parts together.

@Pudd27ut 5 лет назад

My god,That circle spring installed:) N8 was revived And my soul too

@kleberguirado 5 лет назад

Fantastic! Like a Swiss watch. 😁👍

@shujin7024 5 лет назад

fascinating thanks a lot for sharing your experience :)

@n.v.b.3616 2 года назад

Thnx. Used it to fix mine!!

@hemtet5500 4 года назад

Wow a very engrossing Sunday afternoon watch the Pawl mech must be examined

@denislyons Год назад

Incredible. You are like a mad scientist! I have no idea how you can understand all the intricacies. Very impressive. I am having problems with my hub and I was hoping there would be a quick fix. Something got caught between the hub and the wheel and now when i pedal, everything slips and i can't propel the bike forward. Any ideas?

@danielbursch3605 Год назад

Very useful video! I have a Nexus 8 inter8, model number SG-C6000-8R. What I discovered is that I have a needle bearing type of clutch...so I do not have the pawls like other hubs have. I had removed the roller bearing ring and did not put enough tension on the spring when I reassembled it. The symptom I had was that when I shifted to 5th or higher, I could not pedal any longer...it locked up but the wheel kept spinning. I'd attach a photo of what my clutch looks like but I couldn't figure out how to include a photo....Thanks again!

@MrKatsu93 Год назад

I have the same issue, not same model thou. Which spring are you reffering to? General clamping of everything or the collar thingiy with lots of cylinders or maybe something else? Sry, not used to the names of everything 🤣

@kenken-ss7jn Год назад

17.02. i need to replace that ring, found a broken piece of it when i diambled the gear my gear jumps over in 4 and 8 and make a noisy metallic sound

@bob-ny6kn 5 лет назад

The pawls seem to ride a cam shaft, where pawls and cams do not perfectly mate, but close enough to "work" some of the time. Maybe the pawls are axially displaced along the cam shaft (a missing/broken/extra spacer or debris), or vise versa - the cam shaft is axially displaced inside the pawls.

@stewartgrant3607 9 месяцев назад

Good effort 👌

@martinberry1040 5 лет назад

Good gracious, what kind of mind invented that mechanism - I mean, someone must have been dreaming about it and got up at 3am and started sketching stuff out. Great attempt at putting it back together, maybe it did not conclude quite how you intended, but what the hell. In the real world, would it be economic to service a hub like that - the number of man hours involved must be quite large. Anyway, it's the sort of thing I would attempt, figuring out how it's working during the process. Good job and thanks for sharing with us.

@rustygramm7104 5 лет назад

very interesting. who knows how gunked up this inside of those pawls are? could just need a good cleaining and reassembly. thanks for making this video!