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Help me understand my Dura Ace 7400 hub.

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Help me understand my Dura Ace 7400 hub.

Old 11-03-19, 09:01 AM
  #1  
rosefarts
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Help me understand my Dura Ace 7400 hub.

Before I mess it up.

Got the Uniglide cassette off no worries. Scrubbed the years of nicotine off the body, spokes, and rims. Now it's time to grease the bearings.

The assembly looks the same as most hubs except for some dimpled plastic caps that say "open" and "close".

What is that? A seal? Does it need to be turned to open before I grab the spanners? They're 35 years old and Uniglide, so if I break them, they're gone.

Speaking of Uniglide. Am I correct that according to Sheldon, I cannot do a HG freehub on this? The way I read it was that you can swap 6, 7, and 8 UG bodies but cannot put a HG on for Dura Ace.

So if I want to expand my 13-24 6 speed cluster, I need a Dremel tool, a 7 speed cassette that comes apart, and to guard my 13 tooth threaded cog with my life. This is a pretty cheap and viable option actually if it works.
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Old 11-03-19, 11:58 AM
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Originally Posted by rosefarts View Post
Before I mess it up.

Got the Uniglide cassette off no worries. Scrubbed the years of nicotine off the body, spokes, and rims. Now it's time to grease the bearings.

The assembly looks the same as most hubs except for some dimpled plastic caps that say "open" and "close".

What is that? A seal? Does it need to be turned to open before I grab the spanners? They're 35 years old and Uniglide, so if I break them, they're gone.

Speaking of Uniglide. Am I correct that according to Sheldon, I cannot do a HG freehub on this? The way I read it was that you can swap 6, 7, and 8 UG bodies but cannot put a HG on for Dura Ace.

So if I want to expand my 13-24 6 speed cluster, I need a Dremel tool, a 7 speed cassette that comes apart, and to guard my 13 tooth threaded cog with my life. This is a pretty cheap and viable option actually if it works.
In the open position, there is a small hole to admit a grease needle. moving to the closed position seals it off.
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Old 11-03-19, 07:11 PM
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According to the VeloBase web site there were 8-speed Uniglide/Hyperglide freehub bodies made for the 7400-series Dura Ace hubs as the FH-7403 model. Unfortunately, you are limited to freehub bodies specifically made for the 7400-series hubs as their mounting system is completely different from later 7700 Dura Ace, 105, Ultegra, etc. models.

Here is the VeloBase web page:

VeloBase.com - Component: Shimano FH-7403 / HB-7400, Dura-Ace 7400 (Hyperglide Rear)
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Old 11-05-19, 06:33 AM
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I can say with certainty that the 7403 freehub will handle a 10 speed cassette. I had a set of very nice 7400 hubs with a 7401 freehub. Since 7403 freehubs are basically unobtanium, I was lucky enough to pick up a set of donor hubs with a 7403 freehub. To swap the freehubs you will need the special tool, I don't see any way to remove the freehub without it, except for destructive removal. Not recommended. I had to lace the 7403 hub into a wheel to produce enough torque to remove the freehub.

You may have to swap in a longer axle to have the 7403 work with a 10 speed cassette in a frame with 130mm rear dropout spacing. Even if your axle is the proper length for 130mm spacing, the tool to tighten/remove the cassette lockring will not fit over the cone locknut. You just have to tighten the cassette lockring before inserting the axle.

Also, the cone/locknut on the drive side will be recessed into the 7403 freehub, so you'll have to tighten them before inserting the axle and make your preload adjustments on the NDS. Not a big problem, you just have to alter your normal sequence.
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Old 11-05-19, 09:07 AM
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Compatible within the 740x line and nothing else?

So I've got the bike together and rideable. It's actually pretty sweet as it sits. I'm going to leave the gearing as andi just not take this into the mountains.

I would like to get the UG freehub body off for lube. It's a 35 year old bike that has sat for 30. I'm absolutely certain that the freehub only has the lube it came with when new. Other than a specific tool that I probably can't get, can it be done? Can I inject light grease into it? Not the axle bearing (cleaned and lubed those already) but the freehub?
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Old 11-05-19, 09:12 AM
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I don't think there is realistically any way to remove the freehub without the tool.

I can ship mine to you so that you can use it, as long as you ship it back when you're done. PM if you're interested.
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Old 11-05-19, 09:35 AM
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I'll talk to my lbs tomorrow, if they can't do it, we'll make a plan.
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Old 11-05-19, 09:47 AM
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OK. Before installing it into the hub, I lubed my 7403 by soaking it for a couple of days in a bath of Mobil 1 Synthetic gear oil. Then took it out and let it drain for another couple of days. That should take care of it for a very long time.

Interestingly, the Shimano docs for the 7400 hubs say that the threads on the freehub and the threads in the hub should be dry, no oil or grease on either. Seems odd to me not to use something when dissimilar metals are threaded together but I followed their instructions.

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Old 11-07-19, 06:10 AM
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TL-FH10 tool dimensions needed (DA7400 freehub body remover)

https://si.shimano.com/pdfs/si/SI-N-...00-ENG_GER.pdf

Read this thread
Need TH-FH10 tool for ten minutes......
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