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3 speed slipping in 1st gear

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3 speed slipping in 1st gear

Old 04-23-19, 04:19 PM
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Dr1Gonzo
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3 speed slipping in 1st gear

After rebuilding a wheel and putting back into the dropouts, my hub is now slipping in 1st gear. It's an SRAM i3.
Amy ideas how to adjust it? I tried turning the barrel on the shifter but it's not helping
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Old 04-23-19, 04:24 PM
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CliffordK
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I've got a SRAM Duodrive that slips in one gear. I haven't been using it for a while, but meaning to tear it down and have a look inside. If you don't get a good response, I'll try to get to it this week.

Was everything OK before you did the maintenance?
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Old 04-23-19, 05:00 PM
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Originally Posted by CliffordK View Post
I've got a SRAM Duodrive that slips in one gear. I haven't been using it for a while, but meaning to tear it down and have a look inside. If you don't get a good response, I'll try to get to it this week.

Was everything OK before you did the maintenance?
Yes was fine before- an occasional once a week slip maybe but I put that down to just the way the hub works. Even now if i put it in 1st whilst it's slipping, I adjust the barrel a bit, it then stays in gear properly. As soon as I switch to 2nd or 3rd and then back, it slips again. Could be the wheel is in a slightly different position in dropout making cable shorter/ longer but I would have expected the barrel adjuster to help

Last edited by Dr1Gonzo; 04-23-19 at 05:07 PM.
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Old 04-23-19, 05:43 PM
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Mine slips in high gear under torque.

Tighten cable to upshift, loosen to downshift.

Have you tried disconnecting cable, and testing without cable?
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Old 04-23-19, 08:06 PM
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Originally Posted by CliffordK View Post
Mine slips in high gear under torque.

Tighten cable to upshift, loosen to downshift.

Have you tried disconnecting cable, and testing without cable?
Difficult to do? How do I keep the cable pulled out whilst turning the pedals to see?
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Old 04-24-19, 01:55 PM
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For "10-speed" bicycles, first gear is considered the easiest, and Tenth gear is considered the hardest. Also the same for driving manual transmission cars, where 1st gear is the lowest gear (with the possible exception of Granny).

What are you considering first: (easy/low), or (hard/high)?

I bought mine used, and it definitely slips in the high gear (hard), I believe with maximum tension on the cable. I tried changing the inline barrel adjuster to no avail. I didn't mess with the push/pull rod much.

I'll try to get the hub torn down later this week and see if there is signs of wear inside.

One thing about the 3-speeds. Slipping is probably really hard on them.

My other bike with the Sachs Dual Drive, uses the chain to shift, and is rock solid with shifting, although I do have some issues with the Ultegra shifters mated to it.
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Old 04-24-19, 02:07 PM
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SRAM has PDF of owner's manuals, online... to read how you adjust them ..
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Old 04-24-19, 04:29 PM
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Originally Posted by fietsbob View Post
SRAM has PDF of owner's manuals, online... to read how you adjust them ..
Yeah it says adjust the barrel.
I'm considering 1st gear as easy, like a car.
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Old 04-25-19, 06:00 AM
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Sram i3 is in IGH, right? I think those are supposed to occasionally be flushed and filled with new oil, aren't they?
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Old 04-25-19, 07:08 AM
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Originally Posted by Koyote View Post
Sram i3 is in IGH, right?
Yep.

I think those are supposed to occasionally be flushed and filled with new oil, aren't they?
Nope.
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Old 04-25-19, 10:24 AM
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I do not have this same hub, but I think it is like the other SRAM (Sachs) IGHs where the lowest gear is with the highest cable tension. If so, the likely adjustment will be increasing the tension by making the cable shorter with the adjuster. It is easiest to do this with the gear shifter in the highest gear (cable at least tension). Turn the adjust a half turn, then test to see if the first gear engages properly. Repeat until first gear engages or the cable is too short to allow the shifter to click into lowest gear (in the latter case, I would expect to rebuild the hub looking for inadequate lubrication or debris within the system). Often, when the tension is too high the middle gear starts to slip, so that will be when you have turned the adjuster too much. With 3 speed IGHs trial and error works well. I have found with older Sachs IGHs that they are very reliable, so if it will not work with cable adjustment, the problems are more serious - I found one which would not behave that the bearing cage had disintegrated and one of the pieces was trapped inside the hub preventing the gears from fully engaging.

-Will
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Old 04-26-19, 09:42 AM
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Otay, Spanky, the SRAM iMotion 3 is a low normal IGH: cable slack = low gear (1st). If the shifter is adjusted correctly so it just barely pulls high gear (3rd) into place as the cable goes completely taut and then low gear (1st) is slipping, the cable is not releasing (relaxing) far enough to allow first to cleanly engage.

Here's something to try: disconnect the shift cable and see if 1st gear still slips. (Don't let any dangling bits get into the chain/cog.) If it doesn't slip (i.e. if it runs smooth):

a) If you took the little fork thingy* (a.k.a. Shift Connector Strap 11.3115.020.000) off the end of the cable and then reattached it, it must now be a little closer to the end of the housing than it was. If this is too short, no adjustment at the shift barrel will help. So skootch the little fork thingy out a bit. SRAM has never published a measurement for this fairly critical dimension. What you need is for "3" on the shift cable to pull the cable out of the hub all the way, and for the little fork thingy/hub cable knob to go pretty nearly slack without coming disconnected in "1".

b) If you didn't take the little fork thingy off the end of the cable, then you've developed a hitch in the get along of the cable/housing or shifter. By relaxing, wiggling & reseating everything you should be able to sort this.

If you disconnect the little fork thingy from the hub and 1st (low) gear still doesn't run smooth, I'd check the hub internals for a broken part (pawl, bearing retainer cage and that slotted axle are known weaknesses in the iMotion 3.) Disassembly begins on page 36:

https://www.sram.com/sites/default/f...glish-reva.pdf

The iMotion 3 is easier to wrench than the ubiquitous Sturmey AW. There is no known source of spare parts for SRAM IGHs.

*Exploded diagrams and component part identification starts on page 5:
https://www.sram.com/sites/default/f...c_igh_reva.pdf

Last edited by tcs; 04-26-19 at 12:08 PM.
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