thedoc46

So this weekend, i decided its been a while since i pulled my cassette apart to give it a good clean.. Except i couldn't for love nor money loosen the locknut. I know for sure i only tightened it last time to 4.0nm or 29ft lb, as i'm pretty anal about my torques.

I put so much strength into it that i snapped the chain whip tool. Only the bolt that holds the chain, and i've managed to fix it using a different nut and bolt. But the problem is that the goddam locknut still isn't coming apart.

OK now i know this sounds like a bit of a hack job, but i do have the tools, so i got out my 1/2" impact wrench, and using a 1" socket, i put it on the campagnolo cassette lockring tool and hit it with it.... Still nothing actually i may have even damaged the lockring tool a little eek!!!!! This thing removes rusted lugnuts, but won't remove a campag locknut ?? It's not been on there all that long, perhaps a yr, as it wasn't that long ago i changed my wheels.

Anyway, are there any tips from the pro's? to get stubborn locknuts off? normally i use just an large adjustable wrench and the chain whip and it does the job.. as its a weird size those tools, not quite a 25 and a little loose on a 26.. I found an 1inch fitted it best.. I guess i could use a breaker bar but i know i'll just shear that whip tool bolt again.

Any tips ?

kingston 

Putting the lockring tool in a bench vise and twisting the wheel works sometimes. You can wrap an old chain around the cassette and clamp that in the vise too if you can't hold it with your chainwhip.

rm -rf

It's a normal "right hand" thread, you are turning it counter-clockwise to remove it? It's only been a year or so? Seems unlikely to have corroded & frozen in place. You've done this before, so you have an idea of the force needed to remove it?

(Yes, the Park Tool lockring tool is a 1 inch hex, not a metric.)
I grease the lockring threads before installing, and have never had trouble removing a lockring.

I used a full sized Sears torque wrench, (19 inches long, 20-150 foot pounds) with a 1 inch deep socket. It takes a pretty good push on the wrench to get the lockring moving.

thedoc46

I'll have another go this weekend with a breaker bar, but just an FYI, what you're doing, that's very bad for the torque wrench. You should only tighten using a torque wrench, never crack a bolt with it. Very easy to throw off the calibration when you use it for cracking bolts, and those things are not cheap !