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Tom Mabbutt

560xp + Sugihara bar - blueing/HOT.

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Hi I can't figure out what the problem is here, probably something silly.

 

I have a 560xp running an 18inch Sugihara solid pro bar (.325 .058), the chain is an Oregon 21bpx (.325 .058 chain 72 links).

 

I put these on new after the nose sprocket went kaput on the previous Husqy bar, immediately the new bar started to blue and get really hot.

 

Made sure the chain wasn't too tight, blew the saw out turned up the oiler so it was flinging out loads and it still happened.

 

Figured it might be something to do with the hardness of the Sugihara steel so put an Oregon bar on and it still happened, not only this it wore the bar rails down like made just over a short time.

 

So I then had the whole oiling system stripped and it still happened.

 

Looking at the chain I can see the the bottom edges of the tie-straps and cutters are sort of burred and pretty worn considering the chain has had little use.

 

The helpful chap at chainsawbars.co.uk said the fact that I hadn't changed the rim sprocket could be contributing to the issue, but it hardly got any wear, and the drive links on the chain look fine.

 

Any ideas? I'm certain that I'm not running the chain too tight either.

 

Ps. Using Oregon bio oil.

Edited by Tom Mabbutt
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Have you got the right gauge chain for the bar? Just because it says it on the box might not mean the chain is right. Mix up some where along the line. It might be worth changing the drive sprocket for what they cost then that would eliminate that if it was a problem or not

Edited by CHC

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Or it could be that you have damaged the chain when the original bar went caput, probably a slight twist on one or two drive links or side straps, take the bar off the saw and put the chain on the bar and move the chain by hand and you might see a tight spot as the chain goes around the tip of the bar if there is a tight spot there then there is your problem.

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As said . Might be an .063 gauge chain .

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Made sure the chain wasn't too tight.....

 

By pulling it from the bar I assume, did you also check it was running freely? ie. pulling it around the bar?

Reason I ask is today I fitted a brand new 20" Sugi light pro bar to the 372 and the chain didn't like it. The bar is a Stihl mount so .063 gauge and the chain is 75LPX (so obviously .063 too). However the chain wouldn't sit in the groove properly and I couldn't pull it round. It was as if the drive links were too thick. As soon as the saw fired up the chain went a bit slack as it settled in so it was re-tensioned. I'm assuming it was just an edge left by the factory. Shouldn't be the chain as it's half way through a reel. Will see tomorrow whether it heats up.

 

Regards,

 

Steve.

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Or it could be that you have damaged the chain when the original bar went caput, probably a slight twist on one or two drive links or side straps, take the bar off the saw and put the chain on the bar and move the chain by hand and you might see a tight spot as the chain goes around the tip of the bar if there is a tight spot there then there is your problem.

 

Seen a few issues with chain damage due to worn drive sprocket ,one in last week , owner fitted 560xp with new 18" bar new oregon chain used for 2 mins and the links were burred so bad that they were binding in the rail .

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Apart from the obvious excess heat, is the chain cutting ok? And is the nose sprocket free running or not?

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