Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Fast onset terrible noise in Shimano generator hub

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Fast onset terrible noise in Shimano generator hub

Old 09-25-18, 05:43 PM
Senior Member
Thread Starter
Join Date: Oct 2015
Location: New Orleans
Posts: 53

Bikes: Aerotek 4000, Huffy Nel Lusso

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Fast onset terrible noise in Shimano generator hub

I've been riding on a Shimano DH-3N80 for 3 1/2 years. Today on my way home I noticed an occasional metallic popping noise coming from my front wheel, accompanied each time by a vibration I could feel in my handlebars. At first it was only apparent when I was on the bike, and seemed to spin smoothly when I stepped off and spun the wheel. I took off the wheel and could tell there was extra play in the hub, and what felt like a roughness in the bearings when I wiggled the axle on the side with the electrical connection that seemed to be the cause of the sound. I rode it another mile home and the noise increased in frequency until it was nearly constant. Does anyone have any idea what could cause this?

I overhauled the hub ~5 months ago. My ride today was very wet. I would compare the sound to riding on a hub with rusty pitted bearings and a broken axle.
eeuuugh is offline  
Old 09-25-18, 11:07 PM
Andrew R Stewart 
Senior Member
Andrew R Stewart's Avatar
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,660

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1734 Post(s)
Liked 46 Times in 33 Posts
Why don't you take the hub apart again and see the internal condition? Andy
Andrew R Stewart is offline  
Old 09-28-18, 10:27 AM
Ride, Wrench, Swap, Race
dddd's Avatar
Join Date: Jan 2010
Location: Northern California
Posts: 6,526

Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 78 Post(s)
Tagged: 0 Thread(s)
Quoted: 534 Post(s)
Likes: 0
Liked 19 Times in 19 Posts
I'm thinking the generator has an air gap, and that some bit of magnetic steel/iron detritus has dislodged from one part and is intermittently interacting within the air gap.

My battery-powered mower motor has this issue, it makes clicking noises and is enough to reduce the motor's output since the air gap is being closed (which messes with the magnetic field enregy conversion). I will need to take the motor apart.

Can you access the armature assembly?
dddd is offline  
Related Topics
Thread Starter
Last Post
04-30-10 04:46 PM
03-20-09 05:56 PM
Northern California
08-26-08 02:07 PM
General Cycling Discussion
04-18-05 03:10 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.