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Author Topic: replacing rear wheel cushman rubber  (Read 1387 times)

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Offline wvshooter

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replacing rear wheel cushman rubber
« on: September 04, 2012, 09:56:15 AM »
CB 750K - I want to replace the rear wheel bearings and rubber cushmans inside the rear wheel.  I've removed the 2 1/2" diameter aluminum nut with the fine threads but am stuck on getting the 7" diameter hub off. What am I missing? 
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Offline NewOldSchool

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Re: replacing rear wheel cushman rubber
« Reply #1 on: September 04, 2012, 10:03:49 AM »
I assume the wheel is off the bike, if so then lay on the ground brake side down. Grab the sprocket and pull up while wiggling it and the whole hub/sprocket/etc comes out of the cush drive as one piece.
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Offline flybox1

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Re: replacing rear wheel cushman rubber
« Reply #2 on: September 04, 2012, 10:05:32 AM »
it should just pull out once the axle is out.  turn it over and whack it with a rubber mallet.
why do you think the cush drives need to be replaced?
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Offline shinyribs

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Re: replacing rear wheel cushman rubber
« Reply #3 on: September 04, 2012, 10:06:08 AM »
What they said ^^^^   but if the sprocket carrier is that tight coming out,chances are your cushions are fine.
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Offline wvshooter

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Re: replacing rear wheel cushman rubber
« Reply #4 on: September 04, 2012, 11:18:38 AM »
Quote
why do you think the cush drives need to be replaced?

They may not need replaced, however, I'm doing a complete tear down and trying to bring all the wear parts back to new. It has been 38 years you know.
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Offline wvshooter

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Re: replacing rear wheel cushman rubber
« Reply #5 on: September 04, 2012, 11:41:39 AM »
Hub is off, thanks for the advice.

What I did...

Reattached the sprocket and ran the four attaching nuts down tight. Laid the wheel, sprocket side down over two 6 x 6" wood blocks with the sprocket suspended between the blocks. Slid a 12" cutting chisel through the spokes and onto the sprocket and whacked the chisel with a ball peen hammer. Hub came out fairly easily.

Cushmans look fine but I'm replacing anyway.
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Offline NewOldSchool

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Re: replacing rear wheel cushman rubber
« Reply #6 on: September 04, 2012, 12:03:01 PM »
Quote from: wvshooter on September 04, 2012, 11:41:39 AM
Hub is off, thanks for the advice.

What I did...

Reattached the sprocket and ran the four attaching nuts down tight. Laid the wheel, sprocket side down over two 6 x 6" wood blocks with the sprocket suspended between the blocks. Slid a 12" cutting chisel through the spokes and onto the sprocket and whacked the chisel with a ball peen hammer. Hub came out fairly easily.

Cushmans look fine but I'm replacing anyway.

Sounds like a really over complicated way, but glad it worked for ya. If it was that tight and difficult to get off, then the rubbers are fine. If they don't have any cracks in them they are even more fine. Why spend money unnecessarily?



Also, "Cushman?"
« Last Edit: September 04, 2012, 12:05:20 PM by NewOldSchool »
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Offline wvshooter

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Re: replacing rear wheel cushman rubber
« Reply #7 on: September 04, 2012, 01:54:12 PM »
Quote
If it was that tight and difficult to get off, then the rubbers are fine. If they don't have any cracks in them they are even more fine. Why spend money unnecessarily?

After looking at these they are fine. If it ain't broke don't fix it.

Thanks for the input.
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Offline CycleRanger

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Re: replacing rear wheel cush rubber
« Reply #8 on: September 04, 2012, 02:37:55 PM »
Even if they "look" fine the rubber after 35 years can be rock-hard. Just something to consider.
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Offline m00ntan

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Re: replacing rear wheel cushman rubber
« Reply #9 on: September 04, 2012, 03:34:28 PM »
Quote from: wvshooter on September 04, 2012, 11:41:39 AM
Laid the wheel, sprocket side down over two 6 x 6" wood blocks

When I did this, I pulled the doughnut wheel out of a junk car, 15" wheels.  It made this work a lot easier.

Those cushmans say pretty dark and greasy.  I can't imagine they could deteriate much.  When you clean the goop off, you might find they are better than new.  The best cleaner for that wheel is oven cleaner, lye, from the dollar store.

Then again, I'm always buying things I don't need.
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