Need New Freehub ?
12-26-21, 06:01 PM
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Need New Freehub ?
I have an old GT Agressor 26" mountain bike with 26" wheels. It has a Shimano FH-RM40-8 rear hub. When I spin the rear wheel without cranking, the cassette doesnt rotate of course when not cranking the pedals around, it remains stationary. It slightly rocks back and fortth. Do you think I need a new freehub ? I wish I had a spare 8 speed freehub to try on it...................
12-26-21, 06:20 PM
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Do you mean it rocks back and forth when the cassette is not spinning, like there is play as if the lock ring is not tightened enough? Or are you meaning a slight wobble when the cassette is spinning, though the lock ring is appropriately torgued. Sometimes, cassettes do have a slight wobble when being used, but not a wobble from looseness. You do not notice it unless you really look when it is in use.
12-26-21, 06:52 PM
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It rocks back and forth when the cassette is not spinning. I will see if the lock ring is tight. Highly possible I guess, havent checked it over in quite a while.
12-26-21, 07:51 PM
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If the slop is not enough to cause a chain engaging or shifting problem leaving well enough alone might be the best near term value. I do agree with a flush of old lube and replace with fresh stuff as a periodic service.
So, the question back is does the slop hinder function? Andy
So, the question back is does the slop hinder function? Andy
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AndrewRStewart
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12-26-21, 07:52 PM
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12-26-21, 08:23 PM
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Here is what you need if you want to pick up a backup, if flushing/lube works, or if you need another freehub body. This depends on if you want to continue using this bike.
Freehub Body: Y-3SL98030 (This is the same body used on an FH-C201 and can be found on eBay for less than $25).
You should check the DS cone to see if you need to replace it with the new FH body.
Drive Side Cone: Y-30G03000 (Maybe from LBS, possibly Wheels Mfg CN-R060).
Shimano Tech Docs..
https://si.shimano.com/api/publish/s...M40-8-1935.pdf
John
Freehub Body: Y-3SL98030 (This is the same body used on an FH-C201 and can be found on eBay for less than $25).
You should check the DS cone to see if you need to replace it with the new FH body.
Drive Side Cone: Y-30G03000 (Maybe from LBS, possibly Wheels Mfg CN-R060).
Shimano Tech Docs..
https://si.shimano.com/api/publish/s...M40-8-1935.pdf
John
12-26-21, 08:29 PM
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It isn't a bad wobble just a slight one and doesn't affect the shifting. From what I heard a little bit is normal. I will flush/lube and quit over thinking it 
thanks guys
thanks guys
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12-31-21, 09:30 PM
#9
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How do I remove the freehub?
How do I remove the freehub? I have an 11mm hex key and am looking at the tire from the freehub side. Do I turn the hex key clockwise or counter clockwise?
12-31-21, 10:31 PM
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CCW if you can put the tool in from the outside of the hub.
