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Old 05-05-14, 02:08 PM   #1
harshbarj
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Shimano inter 8 shifting issues.

I have a fairly new, 2 moths old, shimano inter-8 hub that is now acting up. I installed the hub myself and after about a week, got it perfectly adjusted so all 8 gears worked great. Then suddenly after about a month or so of perfect operation gears 5-8 now want to skip. I can get gears 1-4 to shift as expected, but no amount of adjusting seems to want to fix the issue. I can get around fine on gears 1-4, but it would be nice to have the option to use those gears.

I don't ride hard, and only apply light to moderate pressure on the pedals. Just enough to get going at a slow pace.
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Old 05-05-14, 02:23 PM   #2
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cable out of adjustment is the first thing to check, line up the 2 pitch marks ..
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Old 05-05-14, 02:31 PM   #3
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it is my understanding
that the nexus and alfine internally geared hubs
are very finicky when it comes to cable routing

a problem i have had when trying to kludge together a working bike
is that if you use the wrong anti turn washers
the cable has a very good chance of touching the chain
which can make the shifting act like it has ants in its pants

edit
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Originally Posted by harshbarj View Post
after about a week, got it perfectly adjusted so all 8 gears worked great
this statement raises red flags for me

nexus hubs generally have one adjustment to make
and that is to set the cable tension so that the lines on the hub are lined up when the shifter is in the marked gear
and if that adjustment is made correctly
the hub should work perfectly the first time

so

please describe your setup including
droupout type ie vertical or horizontal
which anti rotation washers you are using
how you have your cable routed
and which shifters you are using

a picture would be very helpful

Last edited by Wilfred Laurier; 05-05-14 at 02:37 PM.
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Old 05-05-14, 04:58 PM   #4
harshbarj
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cable out of adjustment is the first thing to check, line up the 2 pitch marks ..
If I line up the two marks, it's out of alignment and all gears skip. I have to adjust it so the mark is about 2-3mm further back. It's been that way from day one.
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Old 05-05-14, 05:51 PM   #5
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Gears 5 thru 8 are attained when the clutch engages the planet carrier and by passes the low range reduction gear. Best bet is the clutch is not fully engaging, possibly due to a weak spring, or more likely the tabs are hanging up in the shift spring mechanism.
You need to find somebody that has the tools and know how to disassemble it that far.
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Old 05-05-14, 06:07 PM   #6
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Gears 5 thru 8 are attained when the clutch engages the planet carrier and by passes the low range reduction gear. Best bet is the clutch is not fully engaging, possibly due to a weak spring, or more likely the tabs are hanging up in the shift spring mechanism.
You need to find somebody that has the tools and know how to disassemble it that far.
I was hoping it was a simpler problem.

I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.
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Old 05-05-14, 06:13 PM   #7
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Quote:
Originally Posted by harshbarj View Post
I was hoping it was a simpler problem.

I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.
At the very least, you will have to remove the carrier from the axle to see anything. By attaching the cassette joint and working the shifter, you should see the clutch snap forward when you shift to the fifth gear position. If it appears to hang up, you will likely have to remove the driver to sort it out. This requires special tools as you must know if you have fiddled around with these before.
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Old 05-05-14, 08:44 PM   #8
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sounds like something wrong
at the cassette joint it should
line up perfectly

but dan burkhart you
have more experience so
i think you're right too
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Old 05-05-14, 11:02 PM   #9
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Quote:
Originally Posted by harshbarj View Post
I was hoping it was a simpler problem.

I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.
Taking it apart and partially re-assembling it onto the bike as shown in Dan's video https://www.youtube.com/watch?v=x_Gn...GZxhd1WdyVTi-h really helped me track down an engagement problem. It might help solve your problem.
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Old 05-09-14, 09:39 PM   #10
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The drive side cone nut was loose. Tightened it down and then tightened the lock nut. Did not have to adjust a thing. Works great again. Did my shopping rounds and not one skip (about 15 miles total). I'll not worry about the yellow marks not lining up as it works fine again. Wish all problems were this simple. I was worried it was something internal.
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Old 05-11-14, 04:13 PM   #11
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Quote:
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...I'll not worry about the yellow marks not lining up as it works fine again....
Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
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Old 05-11-14, 04:50 PM   #12
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Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
so OP was happy but had it wrong, then became unhappy, fixed it, and was happy again, now you're telling him he had it wrong all along and should never have been happy in the first place. have i got it right?
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Old 05-11-14, 06:27 PM   #13
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so OP was happy but had it wrong, then became unhappy, fixed it, and was happy again, now you're telling him he had it wrong all along and should never have been happy in the first place. have i got it right?
better to ask that
than to suggest tearing it
apart for no reason
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Old 05-15-14, 01:22 PM   #14
harshbarj
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Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
All 8 gears, yes. I actually have checked to ensue I am getting all 8 as I to am a bit concerned by how much the mark needs to be off. But as long as it works and gets me around town, thats all I really care. I may just have a misaligned hub, and I can live with that. Shifting is smooth and trouble free.
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