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Old 05-22-09, 07:11 PM   #1
Mr_Wrench
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Shimano Hg 22 Cog Lockring Removal

I've been searching like the dickens for information on cog lockrings, like on the Shimano freewheels. Are they right-hand threaded or left-hand? I know their not to be serviced but I want to transplant the cogs, and reuse them. Is their a tool for removing this cog lockring? I tried a hammer and punch counter-clockwise, but it's kind of tough. It recently cut it out of a trashed wheel. Perhaps the hammer and punch will work when I get it on a freewheel again? I hope I can do it without buying a new tool!

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Old 05-22-09, 07:38 PM   #2
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I believe that you use a pair of chain whips to remove these lockrings. You unscrew the smallest cog counterclockwise with a chain whip while holding one of the other cogs in place with the second chain whip.

In order to gain sufficient leverage do to this, you want to orient the handles of the two chain whips so that they are close together, so that you can squeeze them towards each other with both your hands, as if each chain whip handle was one half of pair of pliers.

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Old 05-22-09, 08:04 PM   #3
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Quote:
Originally Posted by hernick View Post
I believe that you use a pair of chain whips to remove these lockrings. You unscrew the smallest cog counterclockwise with a chain whip while holding one of the other cogs in place with the second chain whip.

In order to gain sufficient leverage do to this, you want to orient the handles of the two chain whips so that they are close together, so that you can squeeze them towards each other with both your hands, as if each chain whip handle was one half of pair of pliers.
That was the first thing I tried. It's not budging, I've had easier times removing suntour sprockets, and that's saying something. I also remember reading somewhere these are not made for removal. Which makes since with the advent of riveted cassette clusters and catridge-bearings(sadly) So, I'm pretty sure I need to remove the cog lockring first. Thanks for your reply, though

The face says made in Singapore and it's marked with an 08. Either 08 or D8, can't quite tell
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Old 05-22-09, 08:43 PM   #4
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What hernick described is a Shimano Uniglide freehub. Later styles of hub using a lockring. If you can see a lockring on the end of the cassette, you need a cassette lockring tool to remove it. They are supposed to be torqued quite tight so I imagine you'd have a hell of a time trying to remove one with a punch and hammer. The right tool is cheap so I'd suggest buying it rather than destroying the thing to get it apart.

http://www.universalcycles.com/shopp...8&category=221

Oh, and you turn it counterclockwise for removal.
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Old 05-22-09, 10:55 PM   #5
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I don't think I made myself clear. I want to remove the cog lockring on the outside.

Included is a picture

http://www.flickr.com/photos/12698671@N02/3555251935/

Are you sure it's a cassette? I thought it was a freewheel

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Old 05-23-09, 01:08 AM   #6
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Alas! I have removed the cog lockring. It's right-hand threaded not left(>_<) The one on the outside diamater. Like it thought, it turns out to be a freewheel not a cassette. When removing the sprockets I noticed the model no. was printed on the outside cog. How convient! It is Shimano MF HG-22. It turns out to be a rather cheap freewheel on a popular site at $18 and change. The ratchet body has two levels, something you see on cheap freewheels and it's not the same pattern as a Uniglide cassette. These appear to be hyperglide. FYI:Cassettes and freewheel splined sprockets can't be mixed.


Pictures to illustrate further:
http://www.flickr.com/photos/12698671@N02/3556225816/
http://www.flickr.com/photos/12698671@N02/3556225808/

Mod: Could you add to the title "(Shimano MFHG-22 Sprocket removal"?, please. That way someone searching for it can more easily find the repair. There appears to be no other information out there.

Last edited by Mr_Wrench; 05-23-09 at 01:16 AM.
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Old 05-23-09, 02:48 AM   #7
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The Hg 22 is a freewheel and the lock ring holds the cogs and spacers in place on the freewheel's body.

You need a chain whip to hold the freewheel and a lock ring tool to spin the lock ring off counter clockwise...this is seldom done as a replacement is cheap and individual cogs are not readily available.

To remove the entire freewheel you need the right tool which is either the Shimano TL FW30 or the Park FR1.
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Old 05-23-09, 02:49 AM   #8
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Title fixed.
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