German cottered bottom bracket overhaul
02-08-11, 05:23 PM
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German cottered bottom bracket overhaul
I'm new to this type of bottom bracket. I got the cotter pins out, but got stuck trying to figure out how to remove these cups. They don't just thread out, so I'm at a loss. There is play in the spindle, and I thought it would be nice to actually overhaul the BB since I already bothered to remove the cranks.
Ideas?
Ideas?
02-08-11, 08:15 PM
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Does speculation count?
Haven`t seen this particular model before but the design has some similarities with others.
The inner bearing cups are pressed into the bb and the outer cups sit on the axle. The drive side obviously threads on and normally the non-drive side is used for servicing.
Looks like you`ve already removed a spacer and locknut from the non-drive side and the outside race on that side looks like it just slides on a keyway. I suspect you`re already there. Try tapping the axle on the non-drive side - I expect it`ll exit the drive side with the drive side bearing cup attaached and the non-drive side cup will just slide back on that keyway.
Don`t force it - I may be being overly optimistic!
The inner bearing cups are pressed into the bb and the outer cups sit on the axle. The drive side obviously threads on and normally the non-drive side is used for servicing.
Looks like you`ve already removed a spacer and locknut from the non-drive side and the outside race on that side looks like it just slides on a keyway. I suspect you`re already there. Try tapping the axle on the non-drive side - I expect it`ll exit the drive side with the drive side bearing cup attaached and the non-drive side cup will just slide back on that keyway.
Don`t force it - I may be being overly optimistic!
Last edited by Burton; 02-08-11 at 08:19 PM.
02-08-11, 08:45 PM
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burton is right. tap the nds with a rubber mallet and the ds cone should push the center section of the ds out.
02-08-11, 10:40 PM
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Thanks - that makes perfect sense. I'll give it a whirl tomorrow.
02-10-11, 01:43 PM
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Smacked the spindle pretty hard with a mallet from the non-drive side. No luck. Hit it harder? Wouldn't mind seeing that service document... that would be great.
02-10-11, 02:25 PM
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i thought what i had was more in depth but hopefully this helps
also hopefully your bearing surfaces are ok because finding a replacement spindle is going to be .... difficult
also hopefully your bearing surfaces are ok because finding a replacement spindle is going to be .... difficult
02-10-11, 07:21 PM
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LOL The truth is out there!
There are indentations that indicate a profiled tool was used to aid the assembly but they`re so shallow that obviously no large amount of force was used.
Can you rotate the non-drive bearing cup and see it move and strike both sides of the keyway or is it an exact fit? Is there sufficient movement in the axle that you suspect the bearing cage has collapsed?
Keep us posted please! At this point I`m curious. Besides - happy endings are nice!
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