Campag veloce 10 speed shifter issues...

[BigonaBianchi]

The chain jumps across the cassette from the middle sprockett to the smallest sprockett. However it only does so when I click the shifter thumb button properly. When I simply flick the button down in rapid succession the chain shifts correctly, one cog at a time. It shifts from smallest to largest fine no matter how I operate the thumb button on the shifter.
I've reset all the indexing, all limit screws & reset the front mech as well. Greased a new rear gear cable and replaced. I'v e checked the hoods and the little rubber knob is sitting inside it's hole in the shifter fine. There is no bar tape affecting the thumb button free operation.
The shifter is relatively new, about a year. I'm guessing its the shifter and nothing else simply because it shifts fine when i flick the thumb button instead of pushing it down click by click. Did I miss anything?
Cheers.

 

[TissoT]

The springs may have gone in the shifter... similar happened to mine jumping in the middle sprockets this was a Centaur End up with a new body .

 

[accountantpete]

What I think should happen is that pressing the thumb shift down releases the spring based drum inside holding the cable and sets up a stop after a certain amount of cable has been released. However something goes wrong with the timing on this type of shifter (wear or whatever) and if you press fully down on the thumb shift the drum turns releasing the cable but the stop is not set up properly and the ratchet fails to engage. This results in the spring loaded drum revolving all the way around and releasing all the cable.

I don't know of any fixes - I did sort out a similarly malfunctioning left hand shifter but that was far easier that a right hand one.

 

[Graeme_FK]

This can occasionally happen in Veloce and Centuar shifters made since 2007.

Prior to that, the internals were all metal and basically very similar to the Record unit (albeit with materials and some differences in how some of the mechanical parts were made).

In 2007/8 season the decision was taken to make the action much lighter and to bring the entry-level shifters in line with how other maker's shifters work ... so the "Escape" mechanism, now also used and re-branded as "PowerShift" was born.

Depending on whether you have Escape (made up to end 2008) or PowerShift (made from 2010), you'll either need some variation on complete lever body EC-VL100 or EC-CE300 to fix the problem ... there are some different part number according to whether the lever behind the brake lever (Lever 2) is in silver alloy or composite. The brake lever, clip and hood swap across to the new body complete.

There are no serviceable parts in these shifters. There are odd parts floating around but internal spares for these shifters are not supplied. Even fitting a new part into the lever body sub-assembly in many cases won't guarantee a fix - even fixes achieved by swapping the cable bushing (the part often identified as at fault) may not be permanent as the problem that has been seen is, as AccountantPete says, a timing error, but the timing error is produced by a couple of different mechanisms, one of which can be plastics degradation in the presence of some combinations of mineral oils - it took long time to identify the problem and fix it as it's produced specifically by a combination of oils and it often only occurs over a relatively long time in service.

A new body, in the case of PowerShift, made since Nov 2013 (as pretty much all will be, that are now supplied) will not have the problem due to a change in materials.

HTH
Graeme
Velotech Cycling Ltd, UK Main Tech and Service Centre for Campagnolo

 

[TissoT]

Just as a matter of interest Greame do you/velotech repair centaur and veloce shifters
Are they worth saving given the parts inside are not as good as a record ?

 

[Graeme_FK]

Hi TissoT, yes, at Velotech we'll repair anything Campagnolo (or indeed any other brand but our main expertise is Campagnolo) that is repairable, as long as the parts are available and we have a reasonable expectation that the repair will last. Our mantra is generally one of repair being preferable to replacement but there are times when it's either just not economic and we'd be doing the customer a dis-service by making a repair when there are better options available - and there are occasions where we could make a repair but we'd have the expectation of a failure occurring again within a short time.

 

[TissoT]

Thanks for replying and for the information Greame .
its is good to hear you will try to repair rather than replace when ever possible .
I may need your services one day Campagnolo being on all of the bikes I own .

 

[Smokin Joe]

Thanks for replying and for the information Greame .
its is good to hear you will try to repair rather than replace when ever possible .
I may need your services one day Campagnolo being on all of the bikes I own .

Top man, even though I'm on the other stuff now because it came with a bike I bought.

 

[TissoT]

Top man, even though I'm on the other stuff now because it came with a bike I bought.

I don't mind the other stuff its a bit more robust ... I have Italian frames so I thought I would keep with theme !!