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Left Shifter Not Pulling Enough Cable

Old 05-04-21, 05:46 PM
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jolly_codger
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Left Shifter Not Pulling Enough Cable

Hello,
I am trying to set up a Shimano 105 10-speed drivetrain and am having the most front derailleur trouble I have ever had in 40 years of cycling. Here is what I am struggling with: Shifters are ST-5800 & front derailleur is FD-5800 - when I try shifting to the big ring, the shifter does not seem to be pulling enough cable to complete the shift. I've backed out the limit screw almost completely out and when I bow-string pull the cable on the downtube the derailleur moves well past the big ring and that is why I am down to the shifter as the problem. I pulled the cover off the shifter and can see that the cable spool is hitting a hard stop after going thru the trim positions, but do not see any way to adjust that. The stop mechanism also has a tab on the other side to stop movement towards the small ring so I do not think that is broken. The Shimano Dealer's Manual is no help on this issue either. I don't see any foreign object in there to be hindering the motion of the shifter. Does anyone have any suggestions on how to get the FD working?
I appreciate any help that you all can send my way,
Thank you,
John
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Old 05-04-21, 06:47 PM
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Make sure that your shifter is in the lowest gear position and reattach tge shift cable to the derailleur.
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Old 05-04-21, 06:59 PM
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More and more front shifters and ders need zero cable tension when "at rest" and may work better with some cable preload. Is there a cable adjuster to fine tune cable tension? Andy
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Old 05-04-21, 09:05 PM
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icemilkcoffee
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Originally Posted by jolly_codger View Post
Hello,
I am trying to set up a Shimano 105 10-speed drivetrain and am having the most front derailleur trouble I have ever had in 40 years of cycling. Here is what I am struggling with: Shifters are ST-5800 & front derailleur is FD-5800 -
the 5800 series is 11 speed. Are you somehow mixing 11 speed and 10 speed components?
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Old 05-05-21, 03:28 AM
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Check the orientation of the front DER in relation to the face of the chainrings, they should be parallel. Also some pictures (detail) of how the cable is attached to the DER (I have seen it done wrong that causes this issue). Last if your lower gear limit is under adjusted, it may cause less cable movement thus not being able to get into the higher gear.

Here is a video on the installation that may help

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Old 05-05-21, 04:52 AM
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Originally Posted by JoeTBM View Post
.... if your lower gear limit is under adjusted, it may cause less cable movement thus not being able to get into the higher gear....
This was my thought as well. I leave about 1mm of clearance when setting the low limit.
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Old 05-05-21, 04:58 AM
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There are no shortage of wrong ways to attach the cable on those derailleurs. The most common way to attach it wrong is by wrapping the cable over the pinch bolt. refer to the dealer manual for the proper installation. https://si.shimano.com/api/publish/s...002-05-ENG.pdf
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Old 05-05-21, 10:00 AM
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On the FD-5800, Shimano has a fixture to put on it to determine whether a switch on the FDR needs to be flipped. That might be your problem. Make certain you don't have an FD-5801 though, because that doesn't use the fixture.. IIRCC.

Or as another suggested you have too much slack in your cable. Possibly your cable housings aren't staying seated in the cable stops and ferrules when in the small front.
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Old 05-05-21, 09:51 PM
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What Iride01 and dsaul said. What the converter pin does is optimize the pull angle of the cable on the derailleur arm. If the pull direction is too close to arm pivot, shifting is hard and strenuous. If the pull direction is too far out, the pulls aren't crisp and low trim doesn't do anything. Remember, on 5800 low trim is lower than low. Before attaching the cable shift to low trim.

Another issue is that because low trim is lower than low, cable tension on 5800 is tighter than what we've been used to on other Shimano derailleurs. To assist getting enough tension I like to pull the derailleur out a little by either overtightening the low limit screw a little or sticking a 4 or 5 mm Allen wrench between the derailleur and the frame. Also, make sure your inline adjuster is screwed mostly in. With the derailleur out, route the cable correctly past the correctly positioned converter pin, pull snug (needle-nose pliers help), and clamp it down. Restore limit screw to correct position (or pull out the Allen wrench) and fine-adjust for indexing. Remember, low trim is lower than low.
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Old 05-06-21, 03:53 AM
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Yep, I'm an idiot. Thank you icemilkcoffee (got me thinking) and JoeTBM (once I saw the FD in that video I knew I had egg on my face) for making me realize it. The FD is actually a 5700 with the lever arm being shorter than the 5800; ergo, less movement for same pull. My sincere apology for wasting everybody's time.
John
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