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Rob D

Changing the rim/sprocket and using old chains on new bars...

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It keeps cropping up - folks tend to buy a new chain when it stops cutting or it is worn out, a new bar when the same happens or fancy a change - and a new drive rim/sprocket rarely.

 

If you buy a new bar and are in doubt - change the drive rim + don't use old chains on a new bar - even if 'only got it a few days ago' or 'the saw is new'. A used rim wears the chain which wears the bar. Together they all wear together - buy a new bar and run an old rim/sprocket and old chain likely you will wear the bar inside the rails and on the rail surface, much faster.

 

If you have to - keep an old chain for when the bar is 6 months or so + then it's not so important. But with the high spec Sugi/Tsumura/Cannon bars the tolerances are tight - a slightly burred chain [on the drive links] will quickly gouge out your new bar and cause overheating to boot. It's a negative saving.

 

Sometimes a chain will de rail - and often this really burrs up the drive links - putting this on and using an stump to force the chain to start turning then revving the saw to get it running is going to knacker that bar and drive sprocket rapidly. And then put a new bar on - you will wear that bar out x5 as quickly!

 

 

You're better off running things longer and then changing everything together than replacing things one at a time.

 

 

 

 

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And I fully admit when I was full time on the tools I was one of the worst offenders!! Esp hedge reduction and having the chain de rail... I'd just get it back on there and run it until it cut again. I think fair enough - but when you do come to replace stuff replace it together.

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Good luck with this, from what I see, the saws generally only come in when they are totally knackered or someone wants their saw modified.

Preventative maintenance was something that went out the window when I left my 22 years of manufacturing!!

I am amazed that if you have say a top handle, 50cc and 70cc saw, that you would not get them serviced regularly if you haven't got backup saws but there you go and I am genuinely NOT looking for more work.

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On 09/10/2019 at 19:45, spudulike said:

Good luck with this, from what I see, the saws generally only come in when they are totally knackered or someone wants their saw modified.

Preventative maintenance was something that went out the window when I left my 22 years of manufacturing!!

I am amazed that if you have say a top handle, 50cc and 70cc saw, that you would not get them serviced regularly if you haven't got backup saws but there you go and I am genuinely NOT looking for more work.

 

Yep the tough part is when someone is determined to blame the gear ie. bar or chain - it can never ever be them. My opinion is - there is a chance it's the gear or there's a chance it's you. It's so counterproductive to buy a new bar and chain and then run that with a worn sprocket - such a waste of $$

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