Author Topic: Rear Hub Destroyed  (Read 947 times)

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Offline dgilling

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Rear Hub Destroyed
« on: May 31, 2014, 07:17:55 PM »
I took my rear hub to the machine shop to get the bearings pressed out.  I could only get the brake side out by myself.  I really didn't realize there was a inner retainer ring and neither did the machine shop.  He pushed them out and everything came out at once breaking the aluminum on the inside where the retainer ring would sit.  I guess I have to replace the whole hub?  For a 1977 will other years fit? 

The piece that my finger is on flaps around and the gun powder looking spot is the busted aluminum.


My other question is, where on earth is a picture by picture step of removing the rear bearings?  All I could find was very minimal and really only talked about the outer retainer ring.  I still don't think I really understand how to properly remove the rear bearings.  Seems like the following steps should have done the trick.

1.) Remove Brake side bearing by catching a rod on the inner lip and hammering it out.
2.) Drill out taps on drive side outer retainer ring
3.) Remove drive side outer retainer ring
4.) Flip wheel over to have Brake side up, Hammer on inner shaft to push out Driver side outer most bearing
5.) Now that the inner bearing retainer ring is exposed, drill out taps and remove the inner retainer ring
6.) Finish hammering out Inner bearing

What am I missing?

Offline dgilling

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Re: Rear Hub Destroyed
« Reply #1 on: May 31, 2014, 07:25:10 PM »
Will a 77 CB750A Hub fit a 77 CB750K?

Offline 750K

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Re: Rear Hub Destroyed
« Reply #2 on: May 31, 2014, 08:22:19 PM »
I'm pretty sure an early hub is the same as the late hub, it's the sprocket carrier and rim that are wider. The sprocket carrier is 10mm wider as is the output shaft on the motor. Someone please correct me if I'm wrong though but if that's the case then any 750 hub will work. You'll just have to lace it to your 77 rim.
77 Cb750, 78 Kz1000

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Rear Hub Destroyed
« Reply #3 on: May 31, 2014, 08:37:30 PM »
Go to Motogrid.com, find your hub part number then use their cross reference to see which other bikes hubs will work.   
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline scottly

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Re: Rear Hub Destroyed
« Reply #4 on: May 31, 2014, 08:40:30 PM »
I've got a complete K7 rear wheel I'd sell for cheap, but the shipping to Denver might be expensive...
Don't fix it if it ain't broke!
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Offline dave500

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Re: Rear Hub Destroyed
« Reply #5 on: June 01, 2014, 02:06:49 AM »
#$%*ing great machine shop?

Offline ekpent

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Re: Rear Hub Destroyed
« Reply #6 on: June 01, 2014, 05:15:10 AM »
If the machine shop is paying I may have one for----------

Offline calj737

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Re: Rear Hub Destroyed
« Reply #7 on: June 01, 2014, 05:23:09 AM »
You are now properly "experienced" to know there are threaded inner rings. Youre right, not much in the way of pictures in the manuals. But this forum is filled with exactly this type of information.

You can likely find a quality used hub in the For Sale section or PM a few members to see if they have one stashed away. I'd ask the shop to split the cost or at least to provide some small level of credit to your next service.

Going forward, find a vintage bike shop, or at least one that deals with Harley's. These guys will know about this type of fitment.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline lucky

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Re: Rear Hub Destroyed
« Reply #8 on: June 01, 2014, 10:46:00 AM »
#$%*ing great machine shop?


What kind of machine shop would be that !@#$!!

Offline dgilling

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Re: Rear Hub Destroyed
« Reply #9 on: June 01, 2014, 10:19:37 PM »
The guy was a joker but I feel like an idiot too. I should have looked through stuff more. I'll be doing a full write up with pictures when I get a new one. Sounds like scottly is going to help a brother out.