Help with modern suspension thing!!!

[JamesM]

The shock really could do with a some attention. It has a bit of a scar on the stanchion(?) and the pro pedal knob just goes round and round (might just need the grub screw doing up). I didn't really want to prise those plates apart but the distance between them is about 2mm less than the width of the fitting hardware so it won't just pull straight out.

Whats the DU?

 

[dbmtb]

DU insert is the bushing the fitting hardware presses into. They eventually wear and can cause sideways play.

http://www.msb-bearing.com/e-product-01.htm

 

[JamesM]

ok thanks, I'll take a look but I don't think its worn as there is zero play. Thats one of the reasons I can't remove it easily.

 

[dbmtb]

The shock really could do with a some attention. It has a bit of a scar on the stanchion(?)
Whats the DU?

As long as it's not losing pressure, it won't be a problem.

To remove and service, you need to get as much air out of the shock as possible, while it's still fitted to the frame (extra leverage).

 

[dbmtb]

but the distance between them is about 2mm less than the width of the fitting hardware

In that case you don't have many options beyond prying them apart. Seems like they've got distorted and/or overtightened.

What state are the bearings in?

 

[JamesM]

its not distorted. If you look at the photo there is an insert with a thread then another one around the threaded part. these then slot into what I guess is a bronze bushing in the mount that forms a part of the shock body. It's these two inserts that I think need pushing out of the bronze bushing. look at the thickness of the plates (bike) at the edge and then look at the whole id and you can see that the silver threaded part and it's buddy are poking through the whole a bit. On the other side they are poking through even more. I'd have to bend those plate out a fair bit to get it out and I dont like the idea of doing that at all. I suspect I should be able to just push out those silver inserts leaving the bronze bushing in place.

There doesn't seem to be any play in any of the links or pivots and everything seems smooth so I think all the bearing are good. Just want to get the shock off so I can get it serviced/fixed.

 

[dbmtb]

What you call the bronze bushing is the DU.

To service the shock, you don't actually need to remove the fitting hardware (the spacers pressed into the DU) but most people take them off while they're at it anyway to prevent them seizing.

Were you able to unfasten the shock at the swingarm? If so then it should just be a question of wiggling/squeezing it out. You won't be able to remove the hardware before the shock is out of the frame.

What often happens is that the hardware develops play and people overtighten the fitting bolt. The tolerances are very small and overtightening the bolt isn't normally a catastrophe.

Depending on the construction, it looks like the fitting nut might have snapped, leaving the thread inside the mounting hardware. Would probably be best to bash this out AFTER you've got the shock out.

 

[cyfa2809]

put a bolt in the threade bit (not all the way) and bash it

 

[dbmtb]

Problem is you have to be sure you are bashing it the right way....