Question about Craftsman 18" Chain Saw Replacement Bar 36638 3619

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I have a 18" Craftsman gas chain saw. It will not keep running, after two or three cuts it just stops and cannot be started again until it sits for 15 to 20 minutes. I have cleaned the air filter and replaced the plug. any ideas?

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Try removing the fuel cap for a moment, then try restart. If ok, check the fuel vent for plugging. Check the fuel filter for plugging. Inspect the fuel lines for decay or other damage. Check for spark when it stops--it may be the ignition module failing when hot. Check for sawdust and dirt plugging the ventilation system--blow it out with compressed air. Does the engine 4-stroke at speed when not cutting, but does 2-stroke when cutting? Make sure the chain is being oiled while running. Hope this helps!

Posted on Jul 14, 2010

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1 Answer

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What are the steps to getting the chain saw started and idling? What are next steps to cut tree limbs and oil the chain? This chain saw was given to me without a manual.


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1 Answer

My chain saw will not start. I gave it to a guy who messed up the carb adjustments. Need to know the initial carb setting.


Turn both jet screws CW to stops (lightly), then back each out CCW 1-1/2 turns. This is a basic setting and should allow the engine to start and run. Start the engine and allow to warm up, then pull the throttle full on. Turn the H needle CW until the engine starts to speed up, but still 4-strokes. Correct adjustment is when the engine 4-strokes running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle so that the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

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1 Answer

How do you change the air & fuel filters on a Craftsman 18'' chain saw and any tips on its maintenance


The fuel filter is in the gas tank. You need a small stiff wire or something small with a hook on it. There is a fuel line that runs to the bottom of the gas tank. The fuel filter is on the bottom of it. You need to pull that fuel line out of the gas tank to change it. Be careful not to damage the fuel line while trying to fish it out of the tank. It's hard to replace. The air filter should just be under the cover for the carburetor.

For TuneUp

You need to set the mixtures for the carburetor. There is usually a rubber grommet on the side of the housing near the carburetor. You will find a Low and High adjustment screw. The default setting for the H and L carburetor jet is usually to turn them in all the way till they stop and back them out a turn and a half. You should start the chainsaw and warm it up untill it will run without choking. Make sure that the air filter is cleaned. Start by turning the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn from where it idled at the fastest rpm. At this point you may need to adjust the idle adjustment till the saw idles at a good speed but not fast enough that the chain turns. You may need to readjust the idle speed so the chain doesn't turn during idle. To set the high adjustment screw will require that you run the saw at max RPM. It may be a good idea to get someone to hold the saw so the bar doesn't hit anything while you're doing this. Hold the throttle trigger all the way down and then turn the high adjustment screw in and out until you find maximum rpm. Turn the screw back in a quarter turn. Your saw is now tuned for the elevation you're currently at.

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Remove the housing that covers that bar and sprocket. There are two plates on each side of the bar that set over the studs.They may be identical or slightly different depending on the saw but at least one of them will have a hole in it for the oiler. If you remove the bar and both plates you will see the oiler hole on the saw housing. This oiler injects oil through the plate and into a small hole in the bar where the chain picks it up and carries it around the saw. If this hole becomes plugged with sawdust it will keep your saw from oiling the bar proplerly. This hole should be cleaned out periodically. It's not a bad idea to remove the whole chain periodically and clean the chain guide all the way around the bar and get any sawdust buildup out so the oil can flow better.

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Whether you learn to do it by hand or buy a saw sharpening attachment keeping a sharp chain is #1 in my book for keeping your saw running properly. The more pressure you have to exert to cut makes the saw run hotter, the bar wears out faster, the chain wears out faster and the sprocket wears out fast plus it's just plain harder on you to run the saw. In my timber cutting days I would file my chain every time I filled the saw with gas. Here is a helpful video for sharpening a saw. http://www.youtube.com/watch?v=lkSYov5jcO0

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1 Answer

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