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How to remove bottom bracket - old schwinn

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How to remove bottom bracket - old schwinn

Old 05-20-19, 12:14 PM
  #1  
brs485932
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How to remove bottom bracket - old schwinn

Hello,

Picked up a old Schwinn Frontier GS mountain bike at a yard sale last weekend and was working to get it all lubed up. The bottom bracket is pretty stiff and feel like the bearings need some help... google seems to show there are multiple types of the square style bottom bracket and before I mess something up I figure I would ask what the proper method is to disassemble.

Can the bearings be greased in these or do I need a whole new unit? Thanks!


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Old 05-20-19, 12:32 PM
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PARK HCW-4 for the DS & HCW-5 for the NDS.
Use lots of penetrating oil for a day or 2 before.
Fixed cup is Left Hand thread.

Once I get the adjustable cup & spindle removed, I'll lay the bike on its right side and dribble more PO along the BB shell threads so it can run down and reach the fixed cup from the opposite side .
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Old 05-20-19, 01:03 PM
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One thing... If you discover the axle is pitted, a loose ball BB is not easy to find now..

Old choice; have bike shop use their tools that once, or buy them , used rarely thereafter..

Cartridge BB is what took over, separate tool set for those..


....
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Old 05-20-19, 01:05 PM
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Get the right wrench as mentioned above. You may need a heat gun on the shell and mallet on the wrench handle for the drive side.
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Old 05-20-19, 01:21 PM
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I wouldn't mess with the fixed cup unless I had to.

After removing the adjustable cup (non drive side), the spindle and the bearings, clean the drive side cup (with solvent and rag) in place through the shell and look and feel if there is pitting in that cup. study the bearing surfaces and balls and replace if there is pitting or discoloration then slap it all back together with fresh grease and adjust to make those bearings happy (no play, no drag). The adjustment works best if you finger tighten the adjustable cup til it stops then finger tighten the locknut til it stops and then use tools to back the adjustable cup into the locknut.
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Old 05-20-19, 01:37 PM
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If you are totally unfamiliar with this type of bottom bracket I'd suggest finding a video on YouTube to familiarize yourself. In answer to your question, they can be serviced/greased. As long as the bearing surfaces on the cups and spindle races look good they will last a long time. Many came with caged bearing balls and going to loose bearing balls will often make them last longer. Especially those with slight pitting. It's great to have the right tools but I have used a big adjustable jaw wrench for the fixed cup with good results. Perhaps there is a bike coop close by with the right tools? The lock ring/nut on the adjustable side looks like it has a gash in it. As if someone used a chisel to tighten? Back in the 80's when I was poor and ignorant (not so poor now, lol) I would loosen and tighten the lock ring with an old flat blade screwdriver placed in one of the cut slots and a good sized hammer. Of course, getting the right adjustment was then pretty much a two person job. Having the correct tools is much better.
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Old 05-20-19, 01:51 PM
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Get a Hozan Lock Ring wrench for the left side. (counterclockwise to loosen)



Get a large adjustment wrench for the right side. (clockwise to loosen)
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Old 05-20-19, 08:46 PM
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Originally Posted by Mauriceloridans View Post
I wouldn't mess with the fixed cup unless I had to.
...+1. About the only reason to remove the fixed side cup is to repaint the frame, or to replace with something else, like a cartridge BB.
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Old 05-20-19, 10:36 PM
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Jeff Wills
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Originally Posted by mtb_addict View Post
Get a Hozan Lock Ring wrench for the left side. (counterclockwise to loosen)



Get a large adjustment wrench for the right side. (clockwise to loosen)
I would avoid using an adjustable wrench on the fixed cup. It's too easy to have it slip. Use the correct wrench (a Park HCW-4 or similar) to remove it.

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Old 05-21-19, 05:20 AM
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Originally Posted by Jeff Wills View Post
I would avoid using an adjustable wrench on the fixed cup. It's too easy to have it slip. Use the correct wrench (a Park HCW-4 or similar) to remove it.

Agree, and that also has pin spanner end for the adjustable cup, which comes in handy when eliminating spindle play. Alternatively..
.
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Old 05-21-19, 09:20 AM
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Even the fixed cup wrench has little to grip, but the edge, and so there have been tools made to hold down that tool..

and sheldon's BB bolt hack; a big bolt, nut + stack of split washers..
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Old 05-21-19, 12:18 PM
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I think an adjustable wrench might be better, because you can micro adjust the two flat survaces to be perfectly closed over the cup.

The Park wrench is always going to have some manufacturing free play involved. So my opinion is you're more likely to round off the cup's flat with the Park wrench.
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Old 05-21-19, 01:09 PM
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Bench vise works too .. just unscrew the frame from the BB cup then.. gripped in the vise ..
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Old 05-22-19, 12:14 PM
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Originally Posted by fietsbob View Post
Bench vise works too .. just unscrew the frame from the BB cup then.. gripped in the vise ..
Yup. If your bench vice has sharp enough edges, you can put the cup in the vice and turn the frame. Easy peasy.
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Old 05-22-19, 12:49 PM
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I would remove the fixed cup just so you can immediately put it in the garbage.

A Shimano UN55 cartridge BB is $15. I don't understand why anyone screws around with cup and cone BBs.
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Old 05-22-19, 04:16 PM
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Originally Posted by C9H13N View Post
A Shimano UN55 cartridge BB is $15. I don't understand why anyone screws around with cup and cone BBs.
...in general, I do it because they often last longer than a cartridge unit in service. YMMV
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Old 05-23-19, 08:36 AM
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Originally Posted by C9H13N View Post
I don't understand why anyone screws around with cup and cone BBs.
I few issues I ancountered with cartridge BB.

  1. Drive side flange not wide enough to cover the BB shell.
  2. Cartridge feels more frictiony. Cup-n-cone feels smoother.
  3. Diffifcult to match spindle offset length.
This is just to point out that if the cup-n-cone is working good for you...then don't switch to cartridge...because it can be headachy to find the right cartridge BB sometimes.

But if your cup-n-cone is trashed and you cannot find replacement on Ebay....then cartridge conversion is a wise chose.

Last edited by mtb_addict; 05-23-19 at 08:40 AM.
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