How to detach Shimano derailleur from hanger

[vitataxman]

I have a Trek Navigator 50 with a Shimano Tourney derailleur (shown in photo). I would like to repair the derailleur hanger which appears to be slightly bent. All the videos/tutorials I can find show simply unscrewing a 10mm bolt to detach the derailleur from the hanger. There does not appear to be any obvious way to access the bolt which holds my derailleur to the hanger. The plastic cover of the derailleur is not removable as far as I can tell. I can remove the hanger+derailleur assembly from the bike frame (have not done this yet) and then maybe figure a way to detach the derailleur from the hanger; is that the proper way to proceed? Hope I'm not missing something obvious.

 

[fritz katzenjammer]

It’s the exposed bolt at the top of the derailleur. It takes an M5 Allen key.

the black bracket is part of the derailleur, the bit you want to assure is straight is the silver part it is attached to.

 

[vitataxman]

Attaching another photo. The black bracket bolts on to what appears to be the frame of the bike. Is that something that can be safely bent?

 

[fossyant]

You've potentially got two bent bits, the 'silver' hanger and the top metal bit of that Mech. You can bend them back, but I'd suspect it's the black bit on the top of the mech that's bent - usually metal on these Tourneys.

 

[Ajax Bay]

Shimano Tourney derailleur. . . to repair . . . slightly bent.

There does not appear to be any obvious way to access the bolt which holds my derailleur to the hanger. I can remove the hanger+derailleur assembly from the bike frame (have not done this yet) and then maybe figure a way to detach the derailleur from the hanger; is that the proper way to proceed?

This is a steel frame and there is no separate hanger!
Remove wheel.
Remove RD
Straighten “frame-integrated” rear derailleur hanger in situ and steel will take the bend (whereas bending (back) a separate aluminium hanger is a temporary measure only.
(A rear axle is the same thread and diameter btw and I use a broken one if this needs doing (steel frame).)

 

[T4tomo]

This is a steel frame and there is no separate hanger!
Remove wheel.
Remove RD
Straighten “frame-integrated” rear derailleur hanger in situ and steel will take the bend (whereas bending (back) a separate aluminium hanger is a temporary measure only.
(A rear axle is the same thread and diameter btw and I use a broken one if this needs doing (steel frame).)

the issue with that is that if the integrated hanger is lined up straight (which it probably already is now btw) but the top bit of the mech is bent, the indexing will still be all to cock.

it might be agricultural, but maybe the OP is best off just bending the tourney mech back until it looks straight and seeing if that works (or gte a new tourney rear mech to fit to the straight integrated hanger.

a hanger aligning tool is useless in this scenario as its the mech that is bent (probably)

 

[raleighnut]

That looks to me like a mech with integral hanger (built in) so not 2 separate components.

 

[Ajax Bay]

 

[All uphill]

View attachment 751881

Available new for around £8.

I'd get the hanger straightened and stick on a new rd.