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Old 09-27-2002, 09:15 PM   #1 (permalink)
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Mog disk brake hub design

I am working on some designs for a disk brake swap on a 9 inch/mog axle.

I am considering using FORD unit bearing style rotors. The advantage to this that I see is that you can provide some protection for the seal like the factory mog has by machining a shield onto the hub that will surround the seal. The rotor will sit on the end of the hub. With a standard GM style rotor, it has to mount on the back of the hub and won't clear the shield that you incorporate.

I have one prototype done without the seal protection and a new one almost complete with it.

Upon further pondering of the idea, I am wondering if this will just trap mud and crap in it.

I realize that the factory mog one is a slightly different setup with a brake drum enclosing the entire assembly, but have mog owners pulled their brakes apart and found this shield full of mud and crap?

Any opinions?
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Old 09-28-2002, 08:33 AM   #2 (permalink)
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Nice brake set up. But in my opinion it doesn´t make sense to build a disc brake conversion and stay with the stock Unimog bolt pattern instead of a change to 8 lug. For the 8lug you can get real cheap the Hummer wheels with double bead loc and run flat device. Also a big variety of tires. I think it must be possible to get a Hummer rim with bead loc for less than 100$.
Also i do not like is that everything is bolted together instead of using only one solid adapter (hub). Too many bolts who can come loose.
A protection ring for the seal is easy to ad on our hub, but i think there is no need for.


www.killeraxles.com
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Old 09-28-2002, 09:42 AM   #3 (permalink)
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Daniel:

I bought my rear portal outers from Don. He sure is busy.
Him and Rich were putting together the front mog axle for your TJ 6x6 when I picked up my housing ends a week or so ago.


Wolfgang:

Have you had any seal failures with your hub design due to mud and crap getting into the seal?

I realize that it is a double lip seal, but it can only keep out so much crap.

It just seems a lot more exposed without the drum over it and I figure any bit of protection would help.
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Old 09-28-2002, 10:06 AM   #4 (permalink)
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Siebert
I never had a seal failure on my axles, and we have a lot of mud and water here.
Unimog also changed the seal design on the cast axle. The old ones had seal protection, the newer doesn´t have one.

BTW the drum only helps to keep the mud and the heat in!


If someone is interested, i take a sample of my hub and brake conversion to the supercrawl in Farmington!!

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Old 09-29-2002, 11:36 AM   #5 (permalink)
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Thanks for the replies.

One more question.

With all of the different posts on the backspacing of hummer rims, it is a little confusing. I have read different dimensions ranging from 7 to 8.75 inches.

What is the true backspacing of these? I have to allow enough room in the design of the hub to clear the back portal plate. With the current design, I will have about 7.75 inches from the mounting face of the rotor to the portal plate and without a rim to test fit, I am only going by dimensions that I have read. It will be a while before I buy a set, so any help here is appreciated.
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Old 09-29-2002, 07:10 PM   #6 (permalink)
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Quote:
Originally posted by Wolfgang
Nice brake set up. But in my opinion it doesn´t make sense to build a disc brake conversion and stay with the stock Unimog bolt pattern instead of a change to 8 lug. For the 8lug you can get real cheap the Hummer wheels with double bead loc and run flat device. Also a big variety of tires. I think it must be possible to get a Hummer rim with bead loc for less than 100$.

www.killeraxles.com
Those would be my axles. I chose to stick with the 'Mog 6 lug pattern because I can get my new centers welded into my hummer wheels cheaper than I could get an 8 lug conversion.
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Old 10-06-2002, 11:59 AM   #7 (permalink)
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discs

WolfGang,
I haved sinced designed a 8 lug brake conversion with new hubs that I make.

Don
taradon@uniserve.com
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Old 10-06-2002, 02:34 PM   #8 (permalink)
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Quote:
Originally posted by Daniel
THis should answer your question 7.25" backspacing
If you have more questions go here




Dont you mean 6.75" that is what that tape is measuring too.
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Old 10-07-2002, 11:43 PM   #9 (permalink)
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hey don! can you post a pic of your 8lug hub conversion.
also, any news on locking hubs for the mog 404's?
thanks
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Old 10-08-2002, 08:43 AM   #10 (permalink)
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I wish my Mogs had locking hubs..... oh wait they came stock from 1962 with front/rear diff locks.

Hehehe

Later.

Ken S.
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Old 10-08-2002, 06:08 PM   #11 (permalink)
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Quote:
Dont you mean 6.75" that is what that tape is measuring too.
That had me a little puzzled too. I took it to be 7 inches by figuring half way between the front and back bead seeing as it is on a slight angle. Either way is good news for me. I left about 7.75 inches to the portal backing plate.


Quote:
hey don! can you post a pic of your 8lug hub conversion.
also, any news on locking hubs for the mog 404's?
thanks
Don may be secretly working on something, but I have been staring at the parts trying to figure out a way to adapt a locking hub to this, but I just don't see it. I have been thinking about how you would adapt a spindle or a unit bearing hub assembly to the the portal gearcase and don't think that it is possible or nearly as strong as what is there now. If you wanted to use a more common locking hub, you would have to reduce the shaft size dramatically for even a 35 spline hub.

Nobody wants to hear it, but I think a better way would be to create a disconnecting axle up on the axle tube to create a method of unlocking it, or just live without like I am going to do.

If anyone figures out a good way to do this, I would love to see some pics.
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Old 10-10-2002, 05:06 PM   #12 (permalink)
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I don't have any locking hubs in the works, 99% of customers wouldn't even bother with them if I made them. It does seem that using an axle disconnect is a viable option and there is lots of room inside the housing to make one.

Chris if you need a hummer rim let me know I have one you can borrow.

Don
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Last edited by taradon; 10-10-2002 at 05:10 PM.
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