Shimano Tiagra STI RH shifter not working after cable snapped

[Twilkes]

OP replaced the STI and then opened the 'hatch' of the old one "Then I saw a screw on the bottom of the casing and thought it can't be that simple, but undoing the screw allowed the half of the casing to come off, showing the ratchet mechanism and a wee stowaway."
@Zohair - have you tried this to hoik out the broken cable end?

Yeah basically this, if there's an obvious screw on the shifter, undo it and see what comes off.

If the case comes off you might be able to unjam the mechanism.

If all the bits of the mechanism come off then don't undo that screw.

 

[Zohair]

Ok so after 5 very intense hours I managed. So I have the Shimano Tiagra 4700 shifter I believe and I wasn't able to shift down so that I could put the new cable in the hook spot. Then after coming here I realised the old snapped cable was stuck in the shifter still (probably jamming it). On my shifter do not have the screw to remove it, but rather the e-ring, Shimano offers a tool to remove this e-ring but its not really available in my area. so after searching around I found a video of just around about how a e-ring works. getting this e ring out was by far the hardest part, and required me to make some tools myself due to how thin the ring is it. After 1 1/2 hours I finally managed to get the e ring off and separate the STI. After that I can't say for sure what it was but just playing around with it and the new cable which was threaded through I got the shifter to down shift and could take out the broken cable and insert the new. putting everything back together wasn't the easiest but I managed and was definetly easier then getting it apart. Also id like to add I am in noway a bike specialist and this was my first time actually ever changing any sort of bike cable.

 

[C R]

Ok so after 5 very intense hours I managed. So I have the Shimano Tiagra 4700 shifter I believe and I wasn't able to shift down so that I could put the new cable in the hook spot. Then after coming here I realised the old snapped cable was stuck in the shifter still (probably jamming it). On my shifter do not have the screw to remove it, but rather the e-ring, Shimano offers a tool to remove this e-ring but its not really available in my area. so after searching around I found a video of just around about how a e-ring works. getting this e ring out was by far the hardest part, and required me to make some tools myself due to how thin the ring is it. After 1 1/2 hours I finally managed to get the e ring off and separate the STI. After that I can't say for sure what it was but just playing around with it and the new cable which was threaded through I got the shifter to down shift and could take out the broken cable and insert the new. putting everything back together wasn't the easiest but I managed and was definetly easier then getting it apart. Also id like to add I am in noway a bike specialist and this was my first time actually ever changing any sort of bike cable.

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Well done fettling that, you'll fit right in in here.

 

[Twilkes]

Ok so after 5 very intense hours I managed. So I have the Shimano Tiagra 4700 shifter I believe and I wasn't able to shift down so that I could put the new cable in the hook spot. Then after coming here I realised the old snapped cable was stuck in the shifter still (probably jamming it). On my shifter do not have the screw to remove it, but rather the e-ring, Shimano offers a tool to remove this e-ring but its not really available in my area. so after searching around I found a video of just around about how a e-ring works. getting this e ring out was by far the hardest part, and required me to make some tools myself due to how thin the ring is it. After 1 1/2 hours I finally managed to get the e ring off and separate the STI. After that I can't say for sure what it was but just playing around with it and the new cable which was threaded through I got the shifter to down shift and could take out the broken cable and insert the new. putting everything back together wasn't the easiest but I managed and was definetly easier then getting it apart. Also id like to add I am in noway a bike specialist and this was my first time actually ever changing any sort of bike cable.

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Both my sets of 4700 shifters have black levers and that little casing screw so if yours are silver (which they look like in the photo) then they might be 4600s.

Chapeau on the E ring though.

edit - apparently the 4700 shifters route the cable under the bar tape, whereas the 4600 shifters don't, so that's another way to tell.

 

[Twilkes]

This happened to me again, and after re-reading the post above managed to free the debris in 2 minutes without taking the shifter off the bike. What a difference the second time round the block makes!