New chain is noisy
 

Mystery solved: I took a break and went back and found that I threaded the chain wrong. I have the chain wrapped around the metal tab by the upper pulley. The noise sounds like it is coming from the cassette, but it's actually from the chain rubbing this metal tab.

I tried unscrewing the lower pulley to see if I can open the cage enough to let the chain through but no luck. It looks I have to open the chain again and hopefully find another pin tomorrow.

Original post follows:

I put a new chain on my bike, Shimano LX HG70 and found that it makes a lot of noise that seems to be coming from the cassette. There was no noise like that before the new chain. I tried putting T9 lube on there, but it does not seem to change anything.

Initially I did have a tight link where I put the ends together but I was able to fix that. The noise from the cassette is constant.

How old is the cassette and do you get the same noise from each cog ?

If the noise is coming from the cassette, must be a worn cassette responding to the new chain...assuming chain and connecting method were both ok

Mystery solved: I took a break and went back and found that I threaded the chain wrong. I have the chain wrapped around the metal tab by the upper pulley. The noise sounds like it is coming from the cassette, but it's actually from the chain rubbing this metal tab.

I tried unscrewing the lower pulley to see if I can open the cage enough to let the chain through but no luck. It looks I have to open the chain again and hopefully find another pin tomorrow.

Ha! I've done that before. Once is enough...

Save yourself hassle now and later by getting yourself a reusable master link to re-close the chain. Those one-time-use pins are a pain in the a$$.

I called a few shops and could not find anyone that carried the correct pins. I bought a KC Missing Link at the closest one.

Should have left the chain alone and disassembled the derailleur cage.

I noticed that the chain scratched up the paint at that part of the cage. Is it steel or aluminum? Just wondering if I need to cover it to prevent rust. The derailleur, I think, is a Deore M590, not the shadow version.