New Chain Sticking

[ballibeg]

Last time this happened to me one of the teeth was damaged that sat in the bar. Eventually got workmate to admit chain jumped off and wrapped itself around catcher causing the damage.

[Justjames1961]

Hi Guys, thanks for all the help so far.

Away from home for a few days now so can't check anything else till weekend.

When I put the new chain on, it's tight to pull round by hand. Old chain moves freely.

[Mark_Skyland]

The fact that you say it's meant to be a genuine still chain makes me wonder.

 

If it is a stihl chain and all the sizing matches the bar check for damaged dive links especially if you can see where the chain has been joined together. The dive links can get slightly bent while punching out the rivets if it's not done correctly.

[maria warwick]

Take chain off and go round the whole length of the chain and check each linkage for free movement . I had a chain that had one link that was nearly impossible to move…where the chain had been joined... because it was done too tight…….that was on a top-handled Protec…. with cheap chain.

[TGB]

When you get the chance, check the bar rails for signs of pinching. Maybe the old chain has drive links, that have worn thin and now easily glide along the bar. Whereas the new chain's drive links are thicker and are being squished by the worn rails. Just a thought.

[bolthole]

Hi all, wonder if someone can point me in the right direction here.

Fitted a new chain to my MS 251 and it runs fine for about 30 seconds or so, then it jams in the bar.

Saw is oiling fine, it's meant to be a genuine Stihl chain, thought bar was past its best so tried a new bar as well, same thing happens.

Put old chain on and runs fine. Confused .com???

 

I had this with a new Husqvarna I bought from the states a few years ago, when the dollar was 2:1.

 

I can't remember the exact details, but I think the chain and bar were right for each other but not for the sprocket. When you ran the saw the chain was jumping on the sprocket and the tips of the tangs were getting burred-out, making them too wide for the bar groove.

 

It did exactly what you described - started fine but as soon as you got the chain brake off and tried to cut, the chain would jam.

 

The chain was goosed, but the bar was basically okay and everything came good once we got the right sprocket for the chain and bar on!

 

Saw got nicked off the first job mind, but that's another story!.....

[Justjames1961]

Found this link on the chain, where it's been joined? although it moves freely and doesn't seem out off line I'm guessing this is the problem.

[C.J]

Those rivets look like the've been closed with a hammer instead of a rivet spinner.

[Hotrod81]

Should that link not be a cutter?

[C.J]

Should that link not be a cutter?

 

Good point - And I'll bet its not 68 drive links aswell.

 

Looks like the old rivets were ground off and they've reused the tie straps.:thumbdown: