Shimano Nexus Hub Disassembly / Oil Conversion / Overhaul / Hub Adjustment (3 Speed Internal Gear)
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- Опубликовано: 2 окт 2024
- In this video I take you along with me as I figure out how to disassemble a Shimano Nexus 3-speed hub. I clean the hub, relubricate it with Royal Purple 75W-90 gear oil, reassemble the hub, and adjust the bearings.
This is a 3-speed hub mated to a Gates Carbon belt drivetrain, but I think that the procedure would be similar for any Nexus or Alfine hub.
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I've heard that kerosene is a good way to rinse or dissolve the old oil before dipping the hub in a new batch (In this case Royal Purple 75W-90). Would be nice to try that, seeing as kerosine and oil are “co-soluble” - they dissolve in each other.
A hair dryer can be used to speed things up after washing it with kerosene.
I can see that, probably a better solvent but also potentially messy. Then again this is a pretty messy thing to deal with either way.
@@spinningtrue Oh yeah. I'm thinking towel + isoprop to take away most of the stuff like you did. Then perhaps finishing it off with a kerosene bath and letting it dry before dipping it into a fresh oil bath.
Just curious if you had tried something similar before or not. But I guess I'll have to be the guinea pig after all x(
I see you used PPL-1 for the gears and bearings. Seems a bit more thick than Nexus internal hub grease (white). Any issues so far?
Thanks for posting this! I'm trying to fix this style internal hub, so it was great to see the process from start to finish. Also, it was nice to see it done with tools a home mechanic would have
No worries I just bumbled my way through it but I think that this process is solid, I haven't had problems with the hub since doing this.
This has actually been a huge help, thank you! I'm currently working on a friend's bike with this style of hub and it is in need of serious work. The shift pin is actually going too far into the hub and it's not shifting correctly, so I'm going to have to try and re-oil it! Here's hoping this works.
Hmm that's weird, first thought is it's the wrong pin, second thought is that it's not in the right gear when you're setting the cable tension... but it's possible something is messed up in the internals?
@@spinningtrue This hub has apparently never experienced maintenance in its life, and was stored outside for quite a long period of time! The oil is uh... Shall we say milkshake tier. I have a feeling something is internally wrong in the hub, I can get it to shift all three gears but I have to push the pin basically flush with the hub to get it into third, making it unable to shift with the actual hub shifter. Gonna try an oil soak like you did and see if that brings it around before replacing parts!
@@bellabella852 yeah I didn't get too far into taking the internals apart to figure out exactly how this works but I think a good clean and lube to free things up sounds like a good place to start for sure
WRONG. It needs some wiggle play, even after mounting. Damn paranoia about that. LOL. I can see your wheel grinding to a halt.
I have a SA XL-RD5w, X-RD3, and Nexus 7i. And Rohloff14 on my tour bike of course.
The Nexus was tight at first of course, like nearly all bearings on any new bike, wheels, pedals, headset, etc.
So I loosened the left side cone and then coasting almost doubled.
Soon after I got the SA hubs, I put in a thickened 10w30 lawnmower oil. I had a pretty good grease called Krazy Grease, but they stopped production. Still have trouble with it washing out. Excess oil bleeds itself out. All SA hubs are EASY to take apart 100%.
The 5w has done 46 mph on a hill. The Nexus 7i with boat anchor roller brakes only went 38.1 mph. It would only spin 33 seconds. LOL.
And it's actually heavier than glorious SA XL Drum brakes. Better than ANY else. My first SA XL-FDD has 32,000 miles, including 2 mountain tours. Rim brakes are a FARCE.
That's some good advice there, after riding this bike a bit I noticed that it is pretty loud compared to other Nexus hubs. Not sure if you mean that the bearings or the belt need some play in them but my belt was too tight, I loosened it a little and now it coasts very well but still seems quite loud.
I was always fascinated by my brother’s Sturmey Archer gears. I don’t think he ever attempted any maintenance on it though. I presume the Shimano works on the same principle.
I really have no idea! It's kind of like black magic I was just very careful to put it all back together the way it came apart. But I think you're right the principle is probably similar.
The 3-speed Shimano's are indeed pretty similar to the old Sturmey Archer/Sachs hubs.
All packed with grease, as well as the 5-speed Shimano i believe.
Alfine hubs generally use oil.
SA hubs have a SIMPLE design, while the others are hopelessly complicated and need fancy tools and voodoo knowledge. LOL. .
My best friend only ever had a SA 3 speed. He was taking it apart when he was 14 in 1965. There's nothing hard about it after the 1st time. Then decades later in 2012 I finally got smart and bought a SA XL-RD5w and in 2017 a 3 speed , both with drum brakes.
And then I figured out that the 5 speed deraileur I had in 1974 actually had LESS GI spread than my friend's 3 speed. WTF.
I do dozens of 100 mile+ day rides with all my IGH heavyweights. EASY.
My tour bike has a Rohloff14 that only needs an oil drain at 3,000 miles. Gets better all the time. Unlike deFAILeurs. LOL.
Is the sprocket supposed to on be that loose?
I think so yes because it is only held in place by the circlip, there is nothing that tightens it down futher.
Read the manual and use proper tools ...please!!!
"proper tools"? A wrench is a wrench.
And the manual only tells you to use original stuff (internal hub maintenance oil or internal hub grease) but that's so expensive. So it's nice to see some alternatives. It does not say wether you should clean the hub, or a way to rinse of the old oil before a new bath. So the manual is very useless in that sense.