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 Post subject: Xt rear mech stripdown
PostPosted: Mon Jun 24, 2013 10:35 pm 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
I'm wanting to strip down my xt 739 rear mech so I can give it a good clean and polish, possibly reanodize it.
Question is; can the pins that hold the 3 main body parts together be reused? Also whats the chance of getting the bugger back together? I know theres a lot of tension on them there springy bits. I'm quite handy at fixing stuff(in my own special way,) has anyone else tried this with success?
Ta lots.


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PostPosted: Mon Jun 24, 2013 10:51 pm 
Retro Guru
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Joined: Thu May 03, 2012 7:13 pm
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Location: The Cock Inn, Tillett, Herts
You really need a machine vice. Done it once year ago, and while its doable with some sweating it's virtually impossible to take the parallelogram apart without scratching it up.


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PostPosted: Mon Jun 24, 2013 11:10 pm 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
Cheers for that.
Sounds like I'm heading down a slippery slope but nuts, I'll have a go. Just bought two knackered spare mechs off ebay to practice on.
I've got a soft jawed vice, what's the worst that can happen?! ;-)


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PostPosted: Mon Jun 24, 2013 11:49 pm 
Old School Hero

Joined: Sun Apr 28, 2013 8:56 pm
Posts: 209
Location: Flipping between Wigan and Lincoln
Not like you can make them any worse if they're already broken :D

"The worst that could happen"...

You could lose an eye to a "springy bit"?

Aside from that I can only think of the dreaded fridge-suck claiming something small and non-ferrous :p


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PostPosted: Tue Jun 25, 2013 1:20 am 
Retro Guru
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Location: Near Gatwick
Chopper1192 wrote:
You really need a machine vice. Done it once year ago, and while its doable with some sweating it's virtually impossible to take the parallelogram apart without scratching it up.


How did you pull the pins out?


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PostPosted: Tue Jun 25, 2013 5:49 am 
Old School Grand Master
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Joined: Sun Sep 05, 2010 1:10 am
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Location: Heathfield, East Sussex
You have to file/grind off the peened-over 'tabs' holding them in place then drift them out with a parallel punch...


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PostPosted: Tue Jun 25, 2013 7:56 am 
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Location: The Cock Inn, Tillett, Herts
integerspin wrote:
Chopper1192 wrote:
You really need a machine vice. Done it once year ago, and while its doable with some sweating it's virtually impossible to take the parallelogram apart without scratching it up.


How did you pull the pins out?

I pressed them out with a machine vice. Made a release out of wood to support it but still scratched it up.


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PostPosted: Tue Jun 25, 2013 10:06 am 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
Thanks for the info everyone.
As for taking my eyes out with the springy parts, I'll just stick my goggles on. ;-)
I'll put up some pics of any progress I may make.


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PostPosted: Tue Jun 25, 2013 6:12 pm 
Retro Guru
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Joined: Fri Jan 13, 2012 2:28 am
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Location: Near Gatwick
Chopper1192 wrote:
integerspin wrote:
Chopper1192 wrote:
You really need a machine vice. Done it once year ago, and while its doable with some sweating it's virtually impossible to take the parallelogram apart without scratching it up.


How did you pull the pins out?

I pressed them out with a machine vice.


The M735 pins are all in blind holes.


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PostPosted: Fri Jun 28, 2013 11:17 am 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
Is there a way to strip down the mech if the pins go into blind holes? I assume the only way would be to carefully drill out old pins, and then replace them. Probably have to use roll pins as originals come only in unobtainium, unless anyone knows differently?


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