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Dahon Jack folding mechanism very stiff

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Dahon Jack folding mechanism very stiff

Old 03-23-17, 06:56 AM
  #1  
nad12
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Dahon Jack folding mechanism very stiff

Hi all,
I have a Dahon Jack folding mountain bike. It's about 9 years old. I rode it, not very often, on and off for the first two years of having it. For the last 7 years it has been sat in the shed in the unfolded position. I got it out the other week and could not fold it. The folding mechanism was completely stiff. I turn the bike upside down and sprayed some WD40 and a good amount of oil in the folding mechanism hole that I could see. Two days later I was able to fold it but I literally had to stand on one half of the bike and pull, with all my strength, the other half to get it to fold. I tried this process a few more times in hope it would lessen the stiffness but it didn't. Looking at, what I can see of, the folding mechanism bar I cannot see any rust - but the majority of the bar is in the bike's frame.

Have others had this problem of the folding mechanism being this stiff (I mean 'incredible hulk' stiff)?

Have others got the folding mechanism loose again after suffering the stiffness?

I see other Dahon Jacks, the same age as mine, for sale with the mechanism folding fine - I guess it must be due to the 7 years of not using/folding it that has caused this.

Any remedies to get the folding mechanism loose again?

Thanks in advance.
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Old 03-23-17, 07:31 AM
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dahoneezz
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Aluminum bike. Galvanic corrosion?
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Old 03-24-17, 07:43 AM
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nad12
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Originally Posted by dahoneezz View Post
Aluminum bike. Galvanic corrosion?
Sounds like Galvanic corrosion. Do you think other bikes, the same age as mine, have avoided Galvanic corrosion because that have been used on a weekly/monthly basis? Mine has had it set in due to not being used for years.

Do you think some plusgas oil will loosen it all?
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Old 03-24-17, 03:58 PM
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jur
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Aluminium oxide occupies more volume than raw aluminium so when moisture gets in, galvanic corrosion forms the oxide which then clamps down *powerfully* around the hinge pin. This is not uncommon for we get this question from time to time. I also had this on a Dahon. Your only hope is to saturate it with thin oil such as WD-40 and operate the hinge and perhaps it will improve. Mine got slightly better. Recently someone else also reported improvement.
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Old 03-24-17, 09:20 PM
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Azreal911
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My wife has a Dahon Jack and what i did was flip the bike so the open hole to the hinge bolt is facing up and exposed. I had some mobil 1 motor oil so i put a few drops of it in and let it seep in a day or two. after that it became easy to fold and unfold. Keep the bike upside down when you do that so the oil will slowly get in there for a day or two. I had the exact same problem where is was taking a crazy amount of force to fold that friggin Jack.

Please report back to us if any of this worked out for you.
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Old 03-25-17, 01:25 AM
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dahoneezz
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My experience with rusted bolts is to NOT use force. Use heat and penetrating oil and repeat. No experience with aluminum oxide corrosion of hinge pin though. Good luck.
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