SRAM Dual Drive

[Steveu]

I've been lucky enough to acquire a second hand (but barely used) Haibike Xduro Trekking SL (with all original documentation). Its in almost mint condition so having great fun trying it out. One small problem I don't know how to resolve: The SRAM hub gear appears to be working fine (cable moves OK and indicator in correct place in window of the click box) but 2nd and 3rd gear (the highest 2 of the 3 gears) seem to be the same - there is no noticeable change of ratio when switching from 2nd to 3rd or from 3rd to 2nd. Has anyone got any ideas why and what I can do to find the 'missing' gear?

 

[Blew it]

I've been lucky enough to acquire a second hand (but barely used) Haibike Xduro Trekking SL (with all original documentation). Its in almost mint condition so having great fun trying it out. One small problem I don't know how to resolve: The SRAM hub gear appears to be working fine (cable moves OK and indicator in correct place in window of the click box) but 2nd and 3rd gear (the highest 2 of the 3 gears) seem to be the same - there is no noticeable change of ratio when switching from 2nd to 3rd or from 3rd to 2nd. Has anyone got any ideas why and what I can do to find the 'missing' gear?

The pushrod may be bent, very easily done when the wheel is removed from the machine. Remove the click-box and check for full movement of the pushrod. You might need to rotate the cluster while doing so.

 

[Steveu]

Thanks Blew It. The push rod looks fine. It pulls out about 5mm to change from the lowest gear to the middle gear then another 2mm or so to the top gear position - does this sound right? I've measured the distance the bike travels for 5 pedal revolutions when in 2nd and again when in 3rd but its the same.

 

[Blew it]

Another check you might like to try, is to make sure the pushrod is fully screwed in. If it has unscrewed itself by just a couple of turns, that will prevent the high range from engaging. There are several internet forums that deal with dual-drive problems, have a google search and see what comes up.

Although not immediately apparent, the high range is very useful for reducing wear on the 11 tooth cog. Yes, there is a slight loss of efficiency which is detectable....but easily overcome by the electrical assistance.

By the way, you have cracking good bike there, my own Haibike eQ trekking SL is now five years old and still performs the same as when new. I hope you succeed in solving this problem with the hub, they really are excellent machines, both in build quality and geometry.

 

[Vasilis_Pap]

Does anyone have an sram dd3 manual to download for servicing or maintaining the hub gears?

Sent from my SM-P550 using Tapatalk

 

[Steveu]

More problem with SRAM dual drive: somehow the ball cage within the tube that the sprockets slide onto ripped itself apart leaving the rear cogs (and tube they are mounted on) 'wobbling' so they wouldn't stay parallel to the chain ring. I've put new ball race in (from other side of wheel) but it won't re-assemble - there's about 10mm axial play between said tube and the wheel. Having checked exploded diagram of SRAM DD3 hub, there are no parts missing but I can't see how the tube is to be held axially so the innards of the hub stay inside the hub shell. I'm guessing I'll need to get a new rear wheel as the above seems far too complicated to try to fix (and any problem will get ripped apart with the power going through it.