Stuff you learn(t) the hard way by being your own mechanic

[ChrisF]

Question for those that know the SRAM electronic derailures.

 

A gent had a chain snap.  It was next to the quick link, removed one more link wrapped the chain and on his way ...

 

Nope ... we got the chain wrap wrong ... check again ....

 

Took a moment before we saw what happened ....

 

 

The mid idler wheel moved back .... so far back the chain was running from the cassette straight down to the bottom wheel.

 

Checked the locking pin ... fine

 

Just no "pull" on the bottom arm.

 

Is it some function of the electronic mechanism ?

 

Or did something break when the chain let go ?

[droo]

1 hour ago, ChrisF said:

Question for those that know the SRAM electronic derailures.

 

A gent had a chain snap.  It was next to the quick link, removed one more link wrapped the chain and on his way ...

 

Nope ... we got the chain wrap wrong ... check again ....

 

Took a moment before we saw what happened ....

 

 

The mid idler wheel moved back .... so far back the chain was running from the cassette straight down to the bottom wheel.

 

Checked the locking pin ... fine

 

Just no "pull" on the bottom arm.

 

Is it some function of the electronic mechanism ?

 

Or did something break when the chain let go ?

I'd guess the tension spring has either snapped or popped out of its perch.

Lock cage, remove back stop screw, remove cage pivot bolt, remove cage, and see what's what.

Problem should be reasonably obvious once it's in pieces.

[ChrisF]

44 minutes ago, droo said:

I'd guess the tension spring has either snapped or popped out of its perch.

Lock cage, remove back stop screw, remove cage pivot bolt, remove cage, and see what's what.

Problem should be reasonably obvious once it's in pieces.

 

So not exactly the type of DIY job in the ditch towards the end of Smitswinkel ....

 

But yes, a broken or unhooked spring makes sense.

 

 

Having already lost too much time, I advised him to walk the 1km back to the tech zone.

[droo]

14 hours ago, ChrisF said:

 

So not exactly the type of DIY job in the ditch towards the end of Smitswinkel ....

 

But yes, a broken or unhooked spring makes sense.

 

 

Having already lost too much time, I advised him to walk the 1km back to the tech zone.

Simple enough if you've done it before, but a few tiny bits to drop in the grass.

Tech zone was definitely the right call.

[Jono]

So was doing a caliper rebuild on a Shimano 4 pot. Was a bit too relaxed about the process and wasn’t being careful when removing the pistons. Applied compressed air to one of the ports and didn’t have a rag between the pistons. The one piston shot out hit the opposite piston and shattered. 
 

Soooo anyone have a scrapped caliper lying around or a piston? It’s the smaller piston I’m after.

Edited March 23 by Jono
Added pic and cry for help