Stuck 105 derailleur

brokenbus
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Stuck 105 derailleur

Postby brokenbus » Mon Feb 19, 2018 10:50 pm

My 5700series 105 front derailleur will not change down to the small ring even though it has cable slack. It will change if you push it. It happened a month ago so I lubes all the pivot points with silicon spray and worked it back and forward until it was working again. I haven't ridden the bike since until today and back to the same problem. I have got it going again by lubing and working the mechanism but was wondering is this a common thing and do I need a new derailleur if lubing the pivots is only a temporary measure?
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OnTrackZeD
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Re: Stuck 105 derailleur

Postby OnTrackZeD » Tue Feb 20, 2018 9:21 am

Try degreasing it before you relube it.

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ValleyForge
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Re: Stuck 105 derailleur

Postby ValleyForge » Tue Feb 20, 2018 9:30 am

brokenbus wrote:I lubes all the pivot points with silicon spray and worked it back and forward until it was working again.

Can I ask why silicone spray?
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Duck!
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Re: Stuck 105 derailleur

Postby Duck! » Tue Feb 20, 2018 1:14 pm

OnTrackZeD wrote:Try degreasing it before you relube it.

That won't do anything. It needs a corrosion-breaker.
I had a thought, but it got run over as it crossed my mind.

brokenbus
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Re: Stuck 105 derailleur

Postby brokenbus » Tue Feb 20, 2018 1:32 pm

ValleyForge wrote:
brokenbus wrote:I lubes all the pivot points with silicon spray and worked it back and forward until it was working again.

Can I ask why silicone spray?
\


I have a can of it with a fine nozzle so I can accurately spray it where I want. I works great as a lube on door locks.
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brokenbus
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Re: Stuck 105 derailleur

Postby brokenbus » Tue Feb 20, 2018 1:35 pm

Duck! wrote:
OnTrackZeD wrote:Try degreasing it before you relube it.

That won't do anything. It needs a corrosion-breaker.

Hi Duck can you be more specific with what a corrosion breaker is?
I put some innox on it last night which is a better form of WD 40.
I also have some liquid lithium grease spray- worth a shot of this.
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ValleyForge
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Re: Stuck 105 derailleur

Postby ValleyForge » Tue Feb 20, 2018 1:37 pm

PTFE perhaps on door locks. Silicone spray for nylon garage door runners.

Once the corrosion is cleaned off per Duck!'s post, some standard gear lube might be in order.

Hope it is easier to take apart than my Campy R/SR FDs. E-washers flicking all over the garage. :roll:
Ha ha ha! Cookies on dowels.

lone rider
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Re: Stuck 105 derailleur

Postby lone rider » Tue Feb 20, 2018 2:49 pm

Is the spring broken?

AndrewCowley
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Re: Stuck 105 derailleur

Postby AndrewCowley » Tue Feb 20, 2018 7:15 pm

The FD is the only place I use WD40. I find anything else just doesn't get into where it needs to. I also have a 105 5700 FD and have been told that it getting stuck / gummed up is a known issue. Mine once got so bad that it wouldn't move at all. WD40 fixes it for me. I now apply it regularly.

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Duck!
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Re: Stuck 105 derailleur

Postby Duck! » Tue Feb 20, 2018 7:31 pm

lone rider wrote:Is the spring broken?

Doesn't sound like it. If the spring or its locating tab were broken the derailleur would be able to move very freely, just not able to pull itself to the low gear position. It's stuck, which screams out corroded pivot pins & bushings, or a bent derailleur body.
I had a thought, but it got run over as it crossed my mind.

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Duck!
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Re: Stuck 105 derailleur

Postby Duck! » Tue Feb 20, 2018 7:34 pm

ValleyForge wrote:
Hope it is easier to take apart than my Campy R/SR FDs. E-washers flicking all over the garage. :roll:

5600 & later derailleurs are rivetted together, so completely impossible to pull apart. 5500 & older models were bolted, so could easily be dismantled for service, with no e-clips to fly everywhere.
I had a thought, but it got run over as it crossed my mind.

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Duck!
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Re: Stuck 105 derailleur

Postby Duck! » Tue Feb 20, 2018 7:41 pm

brokenbus wrote:
Duck! wrote:
OnTrackZeD wrote:Try degreasing it before you relube it.

That won't do anything. It needs a corrosion-breaker.

Hi Duck can you be more specific with what a corrosion breaker is?
I put some innox on it last night which is a better form of WD 40.
I also have some liquid lithium grease spray- worth a shot of this.

Corrosion breaker, for want of a better term, is exactly that; a product intended for getting in & freeing corroded parts. WD40 is passable, Inox is better, but there are also other products to do that.

Degreaser is exactly what its name implies, a product for dissolving grease, and that's completely irrelevant to the problem at hand. In fact, many degreasers are quite alkaline, which also makes them rather corrosive, so if anything will make the problem worse.
I had a thought, but it got run over as it crossed my mind.

brokenbus
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Re: Stuck 105 derailleur

Postby brokenbus » Wed Feb 21, 2018 10:47 am

Thanks everyone for the comments. I will keep the lube up to the pivots. I have thought about it and are probably guilty of keeping it too clean and not lubing the pivots at all.
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