Chainsaw Knowledge questions

[ADB328]

Ill set the scene a friend recently attended an interview for a conservation job and was asked

If the chain is creeping and the idle speed has been adjusted and the chain tensioner is fine what could cause chain creep?

 

The answer if i remeber right from what he said is

 

The clutch plates are worn and its causing slippage and The bearing behind the sprocket is seized which also causes slippage.

 

This might not be exactly right its been a few days.

 

So ive worked with C saws for a long time now and i didnt know that so i began to wonder what else i dont know so i'm going to brush up on bits of info like this.

 

So my point is where do i go to find this kind of stuff out, the little quirks or the random bits of info that is not usually known, i thought the manual but its basic at best.

 

Any ideas?

[treequip]

You have changed creep to slippage.

 

Creep is when the chain moves with the saw at idle speed

 

Slip is when the clutch wont transmit full power under load.

[GardenKit]

Ill set the scene a friend recently attended an interview for a conservation job and was asked

If the chain is creeping and the idle speed has been adjusted and the chain tensioner is fine what could cause chain creep?

 

The answer if i remeber right from what he said is

 

The clutch plates are worn and its causing slippage and The bearing behin

d the sprocket is seized which also causes slippage.

 

This might not be exactly right its been a few days.

 

So ive worked with C saws for a long time now and i didnt know that so i began to wonder what else i dont know so i'm going to brush up on bits of info like this.

 

So my point is where do i go to find this kind of stuff out, the little quirks or the random bits of info that is not usually known, i thought the manual but its basic at best.

 

Any ideas?

Firstly, the creeping chain is due to weak or broken clutch shoe return springs, or possibly a failed needle bearing.

 

Secondly, where to come to learn odd bits of info?, Here of course.

[fergusonforestry]

bit of an odd question for an interview? think i'd have been stumped on the spot with that one haha, although i guess if the springs in the clutch were knacked that would do it and the stuck bearing scenario, not really something thats ever cropped up for me

[Arran Turner]

Firstly, the creeping chain is due to weak or broken clutch shoe return springs, or possibly a failed needle bearing.

 

Secondly, where to come to learn odd bits of info?, Here of course.

 

And do a cs30 short course it'll clear up everything

 

Arran

[3dogs]

worn springs or lean fuel mix

[RobRainford]

I would have thought idle too high! Wouldn't have thought of the clutch

[GardenKit]

I would have thought idle too high! Wouldn't have thought of the clutch

Very often people try to get the chain to stop creeping by lowering the idle speed, but you can only go so far before the idle becomes unstable.

If the mixture is lean the engine will race at idle, but will be faster than the specified idle speed, richening will bring it down but if you reach the specified speed and the chain is still creeping then it indicates week springs which allow the centrifugal clutch shoes to fly out at too slow a speed. A very common problem.

[spudulike]

Gardenkit is right - chain creep at idle with a properly tensioned chain and idle speed is down to clutch springs almost all the time and a tight needle bearing or string/crap around the bearing/shaft rarely.

 

You usually get that annoying tinging noise as well Grrrrr:lol:

[pleasant]

Repaied a MS250 last week with exactly that problem. Diagnosed sticking clutch drum needle bearing.

 

Don't see many saws with that problem, probably only four or five in last ten years.