Shimano Nexus Hub Disassembly / Oil Conversion / Overhaul / Hub Adjustment (3 Speed Internal Gear)

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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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Опубликовано:

20 мар 2024

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Комментарии : 12

@bellabella852 28 дней назад

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.

@spinningtrue 25 дней назад

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?

@bellabella852 25 дней назад

@@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!

@spinningtrue 25 дней назад

@@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

@jeffturner8927 3 месяца назад

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.

@spinningtrue 3 месяца назад

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.

@nonegone7170 3 месяца назад

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.

@GordoGambler 2 месяца назад

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.

@ossmann89 25 дней назад

Is the sprocket supposed to on be that loose?

@spinningtrue 23 дня назад

I think so yes because it is only held in place by the circlip, there is nothing that tightens it down futher.

@GordoGambler 2 месяца назад

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.

@spinningtrue 2 месяца назад

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.