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Tool Talk Discussion Forum

Chain saw spits chain off

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dopp creek

01-13-2021 20:49:07




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My wife runs a 40 volt Ryobi saw and she loves it, perfect tool for her. The chain comes off frequently, more than any saw Iíve used in the last 45 years. I can put it back on, tension it and within a few minutes it will come off. It is mostly used for limbing so the nose of the bar gets most of the action. I believe it has the original Ryobi bar and chain. Anyone got any ideas?




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Traditional Farmer

01-14-2021 10:38:52




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Too thin gauge chain for the bar?



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Guido

01-14-2021 10:36:00




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Dopp creek,

A couple of things to check. One: is the adjusting tang in the bar slot?

Two; get the adjuster lock nut tight.
If it's an hand adjuster (no tools) get it tight. Most people are not strong enough to do it by hand only, use a pair of pliers.

Never seen a worn bar causing your issue,

Guido.



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Janicholson

01-14-2021 09:48:55




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
I knew my neighbor had a Ryobi (corded) pole saw. I had a branch on a wire and asked to use it. The chain was off, so, as normal, I fixed it. The chain adjuster was pretty flimsy. I put it together and used it gently. No issue. Look it over to see if you can't "improve" the adjuster. Under cutting limbs a bit befor cutting through from top helps avoid bend pinching ! Jim



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kencombs

01-14-2021 08:36:22




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
too little oil will cause them to heat,stretch and jump out of the groove.



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miangus

01-14-2021 08:27:28




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
I have had a chain get a twist in it from being pinched and it would not stay on.



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rvirgil_KS

01-14-2021 06:49:54




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
"It is mostly used for limbing so the nose of the bar gets most of the action." Natural off balance of the limb twists the limb as the cut is near completed and pops the chain off the bar??



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Steve@Advance

01-14-2021 05:35:36




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Has it always been a problem or is this something new?

If it's always done it, could be something assembled wrong or mfg defect.

Take the bar and chain off, look things over carefully, look for a worn or bent bar, something caught up in the bar, the sprocket for wear, the sprocket alignment with the bar.

Does the chain stay tight? If it backs off, could be a problem with the tensioner or the nuts not tightening down correctly on the bar. Be sure the bar sits flat against the case, nothing caught up under it or a screw backed out keeping it from sitting flat and tightening down.

Hold the chain stretched out between your hands, bow it side to side, it should bow the same both ways. If it has been run on a bent or misaligned bar it may be worn in such a way it favors one side and will continue to jump off even if the root cause is corrected.

Check the sprocket shaft for front to rear, and in and out play. If the bearing is bad the sprocket will be misaligned.

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Bret4207

01-14-2021 05:26:23




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
I see this often with the little dinky saws. You have a tiny chain on a plastic saw. Anything gets under the chain and it will flip the relatively flexible chain right out of the relatively shallow groove it rides in. My Stihl 011 is horrible about that.



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Dusty MI

01-14-2021 05:24:28




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Quoting Removed, click Modern View to see

Or the bolts that hold the bar in place?



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timcasbolt

01-14-2021 03:43:11




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Quoting Removed, click Modern View to seeIs there any chance the threads on the tensioner are worn or undersize causing the chain to go slack when she puts a load on it?



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Charles in Aus.

01-13-2021 20:53:04




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 Re: Chain saw spits chain off in reply to dopp creek, 01-13-2021 20:49:07  
Sounds like the bar is worn . Take it off and trace its shape onto a piece of paper , flip it over and then see if the shape is symmetrical. If not rotated often the under side will wear and create a gap that lets the chain fly off .



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