Dura Ace 7400 stem, stuck.
06-12-19, 12:24 PM
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Dura Ace 7400 stem, stuck.
These seem to be as much of a PITA as they are cool. This one is stuck pretty good, all the screws turn just fine but it isn't budging. They are a crappy design IMHO, everything is trapped by set screws so the cone wont come out the bottom, Shimano says DON'T tap on the wrench/bolt so WTF.
It's been soaking with PB blaster and Marvel Mystery oil for 2-3 days.
Any words of wisdom will be much appreciated, TIA
It's been soaking with PB blaster and Marvel Mystery oil for 2-3 days.
Any words of wisdom will be much appreciated, TIA
06-12-19, 12:34 PM
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I have never owned one , but it looks like if you can get the cover screw off you could tap on the tighten up screw with a proper drift punch and the cone will move down (first loosen up the bolt a few turns , sorry if you knew that ) . If it's stuck onto the steerer tube then keep up with the PB Blaster from the top and the bottom . I just went through this with a 3TTT stem , finally after about 2 wks. I got it .
06-12-19, 03:31 PM
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I have never owned one , but it looks like if you can get the cover screw off you could tap on the tighten up screw with a proper drift punch and the cone will move down (first loosen up the bolt a few turns , sorry if you knew that ) . If it's stuck onto the steerer tube then keep up with the PB Blaster from the top and the bottom . I just went through this with a 3TTT stem , finally after about 2 wks. I got it .
06-12-19, 04:50 PM
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I own a few of these stems and havent had any get stuck.
I would twist and turn the whole stem when its inserted in the steer tube. Then pull.
I would twist and turn the whole stem when its inserted in the steer tube. Then pull.
06-12-19, 05:55 PM
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06-12-19, 07:11 PM
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06-12-19, 07:24 PM
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Well, look how well their advice has turned out so far with that stem?
Stuck.
Stuck.
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06-12-19, 08:47 PM
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How about pouring a little Krud Kutter rust remover into the steerer tube. Might just break up that cone on inner steering tube connection.
06-12-19, 10:05 PM
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06-12-19, 10:12 PM
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06-12-19, 10:18 PM
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The ultegra 6400 and DA 7400 have the same quill + nut wedge design. Seems the nut is seized and isnt allowing the wedge the drop and free up the stem. I'd try a long ratchet from the fork bottom entry and loosen it from there.
06-12-19, 10:56 PM
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They don't though? HS-7400 has a cone like all the other DA stems, and HS-6400 has a wedge like all the other 600 stems. 600 stems have a nut on the bottom of the wedge, DA stems have set screws that are perpendicular and prevent the cone from rotating.
Last edited by Kuromori; 06-12-19 at 11:08 PM.
06-12-19, 11:05 PM
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It seems to be that Shimano stems are a better design in this regard. Tapping should be completely unnecessary because turning the screw should force the expander out.
Last edited by Kuromori; 06-12-19 at 11:14 PM.
06-12-19, 11:21 PM
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OP may have to tie the stem and fork to 2 tractors and have them pull in opposites directions.
06-13-19, 12:53 AM
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Here's the manual, can't really read it though.
Last edited by merziac; 06-13-19 at 01:19 AM.
06-13-19, 04:36 AM
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I don't have one in front of me, but if you were able to give the bolt a few turns it should already be disengaged. I believe the bolt has 2 different thread pitches which are both LH threads. When you turn CCW, the bolt moves down through the stem with the coarse pitch, and the cone moves up on the fine pitch, although the cone moves down more than it moves up due to the difference in pitches. Keep turning the bolt CCW, and the cone keeps moving up the bolt, but down out of the stem, until it runs out of fine threads.
As Macala says, I think at this point it's just the stem stuck to the steerer, not the expander being stuck, so time to use chemicals and force.
As Macala says, I think at this point it's just the stem stuck to the steerer, not the expander being stuck, so time to use chemicals and force.
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06-13-19, 05:50 AM
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You people are missing the simplest solution.
Send the bike to me. Problem solved.
Why so complicated?
Otherwise:
Turn upside down.
PB Blaster 2 days in a row.
Cover with a blanket.
Do the hissy-fit &^%$# bike dance.
Drink something cold and refreshing.
Smile at complete strangers.
Wait 4 days.
Give 10.00 to charity.
Ride 27.34 miles.
Wait 2 days.
Lather, Rinse, Repeat.
That sucker will come right out.
You simply have to honor the mojo.
Send the bike to me. Problem solved.
Why so complicated?
Otherwise:
Turn upside down.
PB Blaster 2 days in a row.
Cover with a blanket.
Do the hissy-fit &^%$# bike dance.
Drink something cold and refreshing.
Smile at complete strangers.
Wait 4 days.
Give 10.00 to charity.
Ride 27.34 miles.
Wait 2 days.
Lather, Rinse, Repeat.
That sucker will come right out.
You simply have to honor the mojo.
Last edited by RobbieTunes; 06-13-19 at 05:55 AM.
06-13-19, 06:41 AM
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I was trying to visualize the wedge design being described then I came across that exact part while perusing eBay this morning: https://rover.ebay.com/rover/0/0/0?m...2F372652115917
06-17-19, 02:00 AM
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You people are missing the simplest solution.
Send the bike to me. Problem solved.
Why so complicated?
Otherwise:
Turn upside down.
PB Blaster 2 days in a row.
Cover with a blanket.
Do the hissy-fit &^%$# bike dance.
Drink something cold and refreshing.
Smile at complete strangers.
Wait 4 days.
Give 10.00 to charity.
Ride 27.34 miles.
Wait 2 days.
Lather, Rinse, Repeat.
That sucker will come right out.
You simply have to honor the mojo.
Send the bike to me. Problem solved.
Why so complicated?
Otherwise:
Turn upside down.
PB Blaster 2 days in a row.
Cover with a blanket.
Do the hissy-fit &^%$# bike dance.
Drink something cold and refreshing.
Smile at complete strangers.
Wait 4 days.
Give 10.00 to charity.
Ride 27.34 miles.
Wait 2 days.
Lather, Rinse, Repeat.
That sucker will come right out.
You simply have to honor the mojo.
As always, patience is key, soak, lather, rinse, repeat, change fluid, wait and Voila!
I think the MM Oil helped as well.
