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After 10 mins cutting small logs the chain becomes lose and i have to re adjust

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If the chain is quite dull, the increased force required to make a cut will overheat the chain causing it to stretch. So will reduced lubrication to the bar and chain. Run the saw at speed with the bar tip near some cardboard--it should throw off a thin line of oil. If it seems to be stingy with the oil, remove the bar and chain (release the chain brake first) and run the engine for a bit to see if the side port in the engine oozes oil out. If ok, clean the two small oil passages that run from the large holes out to the chain groove on each edge. When re-assembling, adjust the chain just up to the bar, but not so tight that you can't turn it by hand. Hope this helps!

Posted on Nov 15, 2010


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Sears 18 42cc chain saw blade keeps coming lose

I have found that the number one reason for a loose chain is from stretching, and that comes from heat or clearing small brush.

Heat being that it is not oiling properly and wears quicker, and the small brush answer (cutting lots of 1/2 in Buckthorn) tends to jerk the chain and manually stretches rather than a steady cut in a log which tends to be smoother.

With that said, yours might be something else. If I can ask a few question... When the saw was purchased, did you install the bar and chain? Second your level of experience - and is this your first saw. What I need to rule out is that the bar could be on wrong.

This saw was more than likely built by Poulan and it should have 2 nuts holding the bar. Does the bar loosen up? If the answer is no you might have a bar that is miss matched to the chain. What that means is that the chains "drivers", the tooth that is down in the bar could be a .050 and the bar could be a .063, hence the chain wobbles more that it should and might be more prone to jumping off.

Solution: Replace bar and chain and make sure they are a matched, lastly, always cut with a sharp chain.

Good luck,


Aug 27, 2014 | Craftsman sears 18" Chain Saw Chain (...

1 Answer

The chain saw cuts through a log in a curve, and then will not cut. Depth gauges are correct and chain is sharp. Will plunge cut and cuts small logs, but will not go through a big log. What might be...

Cutting in a curve is either the cutters are longer on one side than the other, or the bar rails are badly worn, more so on one side.

Jul 12, 2011 | Garden

1 Answer

I have a Poulan ES 350 and need to know how to put chain back on and tighten.

Start by removing the cover securing nut, remove the side cover,wind the chain adjuster screw at the front of the saw anti clockwise, until the old chain becomes lose, pull the guide bar out and off the adjuster pawl, should now be able to remove the old chain, loop the new chain over the sprocket, and into the guide bar rails, make sure the cutting edge of the chain on the top of the bar is facing away from the saw ( the chain rotates clockwise as you look at it )make sure the bar is still located on the adjuster pawl, re fit the side cover, re fit the securing nut finger tight, now turn the adjuster screw with a flat blade screw driver, until the chain sits snugley in the bar rails, there should be no sagging on the bottom of the bar, now lift the tip of the bar and fully tighten the securing nut, run the saw for a couple of minutes, now re check the tention. The correct tention is so you can lift clear two of the drive teeth out from the top of the bar.

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1 Answer

Chain adjustment seems too have some type of problem; it keeps leting the chain come loose or off. ever couple of cuts

The chain adjuster does not actually hold the guide bar, that is done by the bar nut/nuts, the main reason for chains coming lose is inadiquate chain oil to the bar/chain, does the chain look dry? it can also be the result of what you are cutting, if it is very dirty timber or railway sleepers.

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1 Answer

My chainsaw throws the chain off every couple of cuts wont stay on

Release the chain brake, then remove the bar and chain. Lay the chain out on a flat surface and look for damaged links, or sideways bending of the chain. Replace the chain if you find any such damage. Clean the engine surface where the bar fits to, then start the engine--oil should ooze out of the small port there. If ok, then clean the small oil passages that run from the large holes out to the chain groove on each edge of the bar. Re-assemble the bar and new chain (if required)--tighten the chain adjuster until the chain just comes up to the lower bar, but not so tight that you can't turn the chain by hand. Tighten the bar mounting hardware and recheck the chain tension again. The chain teeth must be properly sharpened at a consistent angle to assure rapid cutting which keeps the chain heat down. With a new chain, recheck the tension every so often as the chain will initially stretch when used. Test the chain oiling by running the bar tip near some cardboard at speed for a moment or so--it should throw off a thin line of oil. There should be an oil-volume adjustment screw on the engine to achieve this. Check the sawdust coming from the cut--it should be small chips and curls if the teeth are sharp, but it will be a fine dust if they become dull. Hope this helps!

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Problem with the chain losing, i get 2 cuts and it is lose why

Your chain is getting loose because you are not putting the bar in the adjustment peg. On the front of your saw there is a flat headed screw that screw adjusts the tension on your chain . When you replaced your chain on the bar there was a hole in it down buy the two that hold the bar to the saw,that hole is the adjustment hole where you can adjust the tension on you saw.....

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Remove the clutch cover, bar, and chain. Wash out the interior of the clutch with spray carburetor cleaner to get rid of oil build-up. Reinstall the bar, chain, and cover after cleaning the bar drive-end small oil passages that run out to the chain groove. Adjust the chain up to the bar, but not so tight that you can't move the chain by hand. Hope this helps!

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1 Answer

Hi, I go t a new Husqvarna 450. It cut fine for 10 mins and then stopped cutting well. Engine runs fine but it barely cuts at all. The cut is black as if burned and there's sparks from the chain on the...

Suspect that the chain hit a rock or pocket of dirt which will dull the chain in a heartbeat plus pull debris into the chain groove area. Remove the bar and chain and clean everything thoroughly including the chain and bar groove. Inspect the chain teeth carefully looking for burned teeth and other physical damage. If badly damaged, suggest replacing the chain. It's not likely that the bar sliding surfaces have been severely damaged. When you have everything back together and the chain adjusted, start the saw and run the bar tip near some cardboard--it should throw off a thin line of oil in a few moments. There should be an oil volume adjustment screw on the back or just under the same area near the chain return. Turn the screw CCW to increase flow. Hope this helps!

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1 Answer

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