Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle

New product launch: WIN an innovative aeroe Spider Rear Rack


Shimano FH-RM40-8 Freehub
#1
I have a Trek 4300 with Shimano FH-RM40-8 for the rear wheel hub which i am trying to service. It makes 1 knocking sound on every spin. Got a few questions:
- Can the Body Fixing Bolt be removed from the Freewheel Body? If yes, how?<br />
- Is there any trick to to remove the balls from the Freewheel Body? Can't seem to dislodge them as easily on the other side.
http://www.paul-lange.de/produkte/shimano/support/explosionszeichungen_archiv/FH/FH-RM40-8.pdf

  Reply
#2
To remove the freehub (Part 14) you undo bolt part 12. This requires a large 10mm Allen key inserted down the centre. Hold the wheel, insert the Allen key down the centre and make sure it is inserted far enough. You will probably have to use the long section and then put a tube or spanner on the short end. (right handed thread)<br />
To remove the balls I just poke around and flick them into the centre QR hole. Push them through and out the other side. (The grease holds them in place.) Some Shimano hubs have seals which can make it awkward to get the balls out but none are shown on the diagram.
You say you get a "knocking" every revolution.<br />
How is this showing?<br />
If it's only doing it when you are pedalling then I doubt it is the freehub.<br />
It may be a cracked ball or ( as happened to me) something completely different.<br />
I thought it was the hub but it turned out to be a slack spoke clicking when the tyre was pumped up hard. (once every rev' of the wheel.)

Ride hard or ride home alone!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
5,620
07-31-2015, 08:34 PM
Last Post: Painkiller
 
8,119
01-27-2015, 03:36 PM
Last Post: nfmisso
 
13,888
05-23-2013, 11:21 AM
Last Post: mmontero
 
7,032
01-26-2013, 01:29 PM
Last Post: 1FJEF
 
10,061
11-14-2010, 05:10 AM
Last Post: stancho

Forum Jump:

[-]
10 Latest Posts
Biking inUtah
Today 10:25 AM
26" Thruster® Street Style BMX | July 20...
Today 07:32 AM
Post a photo for aeroe Spider Rear Rack
Today 02:29 AM
Requested question
Yesterday 11:20 PM
Ceramic Oversize Pulley
Yesterday 11:07 PM
RD Alignment
Yesterday 03:40 PM
2020 road cycling season
Yesterday 02:55 PM
Taylor Phinney retires
Yesterday 02:54 PM
Axle is clunky/not spinning smoothly, is...
Yesterday 12:06 PM
replacement chain
Yesterday 11:35 AM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
81 posts
no avatar 2. CharleyFarley
23 posts
no avatar 3. Papa Dom
10 posts
no avatar 4. Painkiller
9 posts
no avatar 5. Nikko
7 posts