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Saw is running, but chain is not moving

The saw is running but the chain is not moving on the bar. Can you help me with this

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  • dsirs Mar 04, 2009

    Just got the chainsaw from pawn shop. Started it, and won't idle, try the throttle and the chain will not travel.

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If you rev the engine and the chain does not spin, either the chain is jammed, or is adjusted to tightly on the bar, or the centrifugal clutch is malfunctioning. With the engine off and leather gloves on, see if the chain will move on the bar, you should be able to move the chain 4 or 5 inches. If you can spin it, the clutch is probably bad. If its stuck, take the housing off over the clutch and make sure the chain is seated on the sprocket and not jammed to the side. Inspect the chain on the bar, there should some slight play in the chain tension. Look for any links that dont flex. This happens to be cause I overtighten the chain to the bar.

Posted on Dec 22, 2008

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1 Answer

I have a Stihl MS 290, runs great, but the chain keeps tightening it's self on it's own


That's an unusual problem, usually the opposite happens. After making sure the chain brake is off, loosen the two nuts that hold the bar. Be sure to hold the bar up when adjusting the tensioner screw and adjust until the chain is just snug, but not too tight. While still holding the bar up, tighten the two nuts firmly. Check to see that the chain can move freely by hand. Then start the saw and run the chain at speed with something in front of the nose to check for adequate lubrication. You should note a slight fine spray of oil on the object in front of the nose of the bar. Inadequate lubrication, a chain that is binding on the bar, or an overly tight chain can cause the bar to heat up and expand, further tightening the chain. A properly adjusted Stihl saw will use almost all of the chain oil in the reservoir for every tank of gas. Too much oil is better than too little. The oil feed may have to be adjusted for operating in temperature extremes. If operating in very hot conditions, be sure that the saw has not run out of chain oil. The oil feeds faster when hot.

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1 Answer

How do i Tighten chain


Jo:
Unplug the saw.
Lay the saw on it's side so the chain and bar are up (lay it on 4X4 blocks or something similar so the motor housing doesn't make the saw rock back and forth) Loosen the two 1/2 or 9/16 nuts... don't take them off, just loosen them a turn or two. Look toward the saw where the bar comes out (the front of the housing where the blade comes out). You will see a small screw head. Turn the screw clockwise (as if you were tightening it) As you turn that screw, the chain will tighten. Put on some gloves and pull the chain around the bar (as if the saw was running, but you are the motor). The chain should move with a little resistance. Pinch the chain at the top-middle of the bar and pull the chain up away from the bar. the chain should pull away from the bar no more than 1/16 to 1/8 inch. If you look carefully between the bar and the chain, you'll see the dogs that run in the groove in the outside circumference of the bar. None of the dogs should be fully exposed when you pull up on the chain (in other words, None of the dogs should come completely out of the bar's chain groove when you pull up on the chain. Now, tighten the two nuts on the back of the bar. Snug them down good... if the bar slips on those two nuts, the chain will come off while you are cutting.

Good luck

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1 Answer

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Had this happen to mine when I was limbing stuff that was too small. I know better. There is probably a burr on one or more of the guide portion of the links where they run in the bar. This causes that link to be tight in the bar at this point. The chain probably hit something on the body of the saw when it flew off. Take the bar off the saw and run the chain through the groove in the bar. If you have any links with nicks, they will bind, causing the chain to stick and not run freely. Once you've identified the problem links you can remove the nicks using 120 grit paper backed up with a flat piece of steel so you only remove the high spots.

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1 Answer

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Turn the saw off. Look for several nuts on the right side of the saw that hold the cover on and the blade to the saw. Loosen these nuts, and before taking the cover off, loosen the chain adjuster by turning it (usually a screw head on the same side, or on the front of the saw as you look down the blade towards the saw.) Loosening the chain adjuster moves a pin that goes into the bar (the part the chain rides around when operating) to push it away from the saw to tighten the chain when you are tightening it. Take the cover off, and put the chain around the sprocket at the back like a bicycle chain, and then while holding the bar (sometimes a partner helps) parallel to the saw and outward away from the front of the saw, align the bottom parts of the chain inside the bar guide slot all around the bar, holding just enough tension that it doesn't fall off the sprocket or get misaligned in the bar guide. Try moving the chain a little bit to make sure it is not binding on anything. If it doesn't move at all, make sure the chain brake is not on. Once it is moving smoothly, put the cover back on, and begin to hand tighten the nuts. Just before they begin to get tight, eyeball where the chain tensioner pin is in relation to the hole it is supposed to go in. Adjust the chain tensioner screw to move the pin towards the hole. When it pops in the hole, continue tightening the nuts by hand until tight. Now you and your partner can let go of the bar. Adjust the chain tensioner for the proper tension in the chain, not too loose, not to tight, refere to your manual. Finish tightening the cover nuts using the universal wrench to the specifications given in the owners manual.

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1 Answer

I have a craftsman 16" 36cc chain saw. Engine


First thing is make sure chain brake is not engaged is so equipped. Next make sure that chain tensensioner is not to tight to allow chain to rotate. I wouuld remove bar and chain from saw and spray both several times with WD-40 and work chain link by link until they all move freely.Clean and lube guide channel on bar and make sure that bar is not dented or badly rusted.If all else fails replace bar and chain. Good luck and thank you.

Mar 14, 2011 | Craftsman Chainsaws

1 Answer

Chain saw starts and runs chain is moving at high speed but when placed against log it slows to a stop and does not cut, what should I do


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!

Jul 29, 2010 | McCulloch 16 Inch Gas Chain Saw MCC1635AK

1 Answer

Where can I find a replacement bar and chain for my saw?


Remove the bar and chain from the saw. Take these parts to a saw servicing dealer who can match the bar and chain. Be sure to clean the area where the bar mounts. Run the saw for a few moments--the oil port in the side of the case should ooze out oil. Install the bar first, then thread the chain onto the sprocket, then work it over the bar. Pull the bar out until the chain is fairly tight, then fit the cover, but leave the mounting nut(s) finger tight. Turn the chain adjuster until the chain doesn't droop from the bar, but still be able to turn the chain by hand. Tight the mounting nut(s) and recheck tension. Run the saw at full speed with the tip near some cardboard--it should throw off a thin line of oil onto the cardboard. Hope this helps!

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2 Answers

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Does the chain move when the motor is started? Make sure the chain doesn't droop from the lower side of the bar and the teeth cut toward you on the bottom side. The chain should not be so tight that you can't move it by hand. Run the saw for a few moments with the tip near a piece of cardboard--it should throw off a thin line of oil onto the cardboard. Make sure that the chain is properly sharpened and cuts without undue effort. Hope this helps!

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2 Answers

Chain saw motor runs but chain doesn't


There are a couple of reason the saw blade will not turn.
- Make sure you have bar and chain oil in saw.
-Make sure oil is running on the saw blade and chain.
-Make sure the clutch is not stuck.
- Make sure the bar sprocket is not frozen.
-The safety kick back guard needs to be re-set.
-Shut off saw. Push and pull guard.
Please let me know what you find.

Feb 10, 2010 | Chainsaws

1 Answer

How do I take chain off and tighten and then put back on.


The chain is not removed to tighten it.

Somewhere around where the bar (the "plate" the chain runs on) is attached to the body of the saw, there is a knob or screw which moves the bar back and forth.

Moving the bar back and forth control the tension on the chain.

Moving the bar away from the saw body tightens the chain, moving it in loosens it.

Charlie

Aug 28, 2009 | Ryobi Chainsaws

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