Rear sprocket and hub issue
- Thread starter Yodaman1
- Start date
fooferdoggie
Well-Known Member
I forgot this is not hwere you need to spend much on better quality tools. the only differewnce between the park chain tool and a cheap one is a longer handle and blue plastic.
PCeBiker
No-Hands No-Pedaling No-Credentials
- Region
- Canada
It is for a freewheel.
The freewheel keeps tightening up as you pedal and/or the mid-drive motor pulls on it.
It can easily go over 100 Nm
Any chain tool will work to remove a cassette from a freehub.
On a freehub the torque goes from each sprocket into the splines on the hub, so the lock ring doesn't get overtightened.
Park Tool has a instructional on freehub servicing
www.parktool.com
I disassembled shimano freehub once which had pawls sticking but it may not be worth your time, unless you're curious, vs just replacing a typical Shimano or Sram $20-$30 freehub.
Freehub Service
This article will discuss freehub service for the following brands: Shimano®, DT-Hugi® (some Bontrager), American Classic®, Campagnolo®, Bontrager®, and more.
www.parktool.com
fooferdoggie
Well-Known Member
as long as the pauls spring back ok its fine. not too much grease or they can stick,
Gionnirocket
Well-Known Unidentified Member
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- USA
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- Y. O.
Pawls look damaged/chipped... How are the ratchet teeth they ride into on the hub?
If it's just the pawls, they are easily replaced.
You'll have to see what parts are available.
as @fooferdoggie says. A very light coat of very light grease on assembly.
If it's just the pawls, they are easily replaced.
You'll have to see what parts are available.
as @fooferdoggie says. A very light coat of very light grease on assembly.
fooferdoggie
Well-Known Member
ya its hard to see seems the inner ones look the same. can't tell if they are chipped or like that.
PCeBiker
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I took a couple snapshots of the video, and the ratchet teeth in the hub kinda look damaged??
If the hub needs to be replaced, then it turns into a Big Job.
Replacing the pawls might get it going, but it probably won't last too long before it breaks again?
@Yodaman1 Can you take another video of the teeth in the hub?
Gionnirocket
Well-Known Unidentified Member
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Hard to tell if the teeth are damaged or if it's just the grease on them..
Wipe it down and inspect for deformities
Gionnirocket
Well-Known Unidentified Member
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- Y. O.
Very interesting......
Pawls still look chipped and if you can find replacements I would do it as there probably inexpensive and easy to replace.
You've already done the hard part
Pawls still look chipped and if you can find replacements I would do it as there probably inexpensive and easy to replace.
You've already done the hard part
Yodaman1
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PCeBiker
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The Pawls do look to be damaged as though they weren't fully seated in the notches of hub??
I'm not sure what that washer was supposed to do but perhaps it wasn't supposed to be there, or it was the wrong thickness (shim washer) preventing the pawls from fully seating in the hub notches?
My hub motor has a shim washer on the axle so the axle nuts can be tightened up without the bearings binding.
See if your cassette is binding or rubbing on the hub housing with that washer removed.
If it seems to have clearance, then maybe that washer wasn't supposed to be there or is on the wrong spot on the axle?
I'm not sure what that washer was supposed to do but perhaps it wasn't supposed to be there, or it was the wrong thickness (shim washer) preventing the pawls from fully seating in the hub notches?
My hub motor has a shim washer on the axle so the axle nuts can be tightened up without the bearings binding.
See if your cassette is binding or rubbing on the hub housing with that washer removed.
If it seems to have clearance, then maybe that washer wasn't supposed to be there or is on the wrong spot on the axle?
Last edited:
Gionnirocket
Well-Known Unidentified Member
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1st...put the beer down when you're shooting video 
That chip on the ratchet teeth looks minimal to me and replacing the hub is much more work.
If it was my bike I would replace the pawls and give it a try.
That chip on the ratchet teeth looks minimal to me and replacing the hub is much more work.
If it was my bike I would replace the pawls and give it a try.
PCeBiker
No-Hands No-Pedaling No-Credentials
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- Canada
The notches in the hub look pretty good
New pawls should get you up and running again, and they may have broken because they weren't seating properly in the hub?
Yodaman1
New Member
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- USA
I'll replace the pawls however, are they universal for a sram 9sprocket cassette? Newbie here so be gentle.1st...put the beer down when you're shooting video
That chip on the ratchet teeth looks minimal to me and replacing the hub is much more work.
If it was my bike I would replace the pawls and give it a try.
Yodaman1
New Member
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- USA
Could be the reason but not sure.The notches in the hub look pretty good
New pawls should get you up and running again, and they may have broken because they weren't seating properly in the hub?
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