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1st shut saw off
2nd obtain wrench that fits bolt to hold bar on (theres only one)
3rd lose en the bolt for bar by only one turn !!
4th locate screwdriver (or a dime works too) and turn small screw next to bar just before it connects to saw
observe chain tension , stop when you can no longer lift the chain up from bar , don't overtighten!!
5th retighten the bolt that holds bar to saw , Tight!!!
6th restart saw and cut wood !!!
Tightening chain is performed by adjusting the bar. Two bolts generally hold the bar in place. Loosen these. Make sure that chain has enough play to easily move by hand. If it sticks, it's too tight. Then tighten the bar, check the chain oil, and cut wood.
The blade is no longer sharp, something not unusual after about an hour of cutting. How long a blade stays sharp depends on what type of wood you're cutting, whether the blade contacted the ground or anything other than wood at any time, and how hard you are working the bar through the wood. If you are cutting hardwood or something like railroad ties the lifespan of the blade is greatly reduced. You can easily sharpen the blade with a hand file or dremel tool with a chain saw blade kit on it or have the blade sharpened. Best practice is to have one or two extra blades so you can change them as they become dull.
. TAKE THE COVER OFF AND YOU WILL SE THE SPROCKET THAT THE CHAIN DRIVES FROM LOOSEN THE SCREW THAT TIGHTENS THE BLADE, IT SHOULD LOOK LIKE A PEG, IT GOES INTO THE BLADE
TO INSTALL CHAIN THE SHARP SIDE OF THE TEETH MUST BE POINTED DOWN ON THE TIP OF THE BLADE, REINSTALL SPROCKET COVER AN TIGHTEN BOLTS HAND TIGHT(MAKE SURE PEG IS IN HOLE OF BLADE)TIGHTEN THE SCREW TO ADJUST CHAIN TENSION , CHAIN SHOULD BE PULLED UP FROM CENTER OF THE BAR TO PREVAIL HALF THE CHAINS LOWER TEETH WHEN PULLED UP. NOW TIGHTEN UP THE NUTS THAT HOLD THE COVER, BUT NOT SCREAMING TIGHT. MAKE SURE TO OIL THE CHAIN WITH BAR OIL.. YOU MIGHT NEED TO DO THIS MANLY IF YOU DON'T SEE A SPRAY OF OIL COMING OFF TIP OF THE BAR WHEN HELD NEXT TO A PIECE OF WOOD WITH THE SAW RUNNING AT A HIGH SPEED ...BE CAREFUL !!! PLEASE , TAKE YOUR TIME, HAVE A GOOD FOOTING WHEN USING A CHAINSAW ! THERE ARE A ON A DANGER SCALE OF 1-10 THERE A SOLID 19 !
Set out the chainsaw parts in front of you. Make sure the chain is facing the right way to cut wood; the teeth should be facing away from you when you are holding the chainsaw.
Secure the chain around the sprocket (a cog-type part found near the chain tension nipple) and align it along the grooves of the bar. You will see a hole for the chain-tension nipple on the end of the bar. Line these up so the nipple fits in the hole on the bar. Pull the chain to tighten it, using the screw to achieve the desired tension
Place the cover plate back on top of the bar and line up the cover-plate housing screws with their corresponding screw holes
Screw the cover-plate housing screws back in and tighten. Test the chain to make sure it spins freely when pulled.
Check the chain to make sure you can lift it about 1/4 inch, so it isn't too tight to spin while cutting wood
You need to tighten the chain, and or remove and reinstall the chain depending on whether or not it has come off the drive wheel. The chain drive is on the right hand side of the saw, and there are either two nuts (about 1/2 inch or 13mm) holding the chain on, or there is a little half round handle you can use to tighten the chain after it is on the drive wheel properly. The saws with the two nuts on them have a small flat blade screw on the backside on the bar that you tighten the chain with. And to make things more confusing, some of the newer bars have a round hole in them, that after you loosen the two bolts, you stick a screwdriver in the hole and turn it clockwise to tighten the bar, then you re tighten the 2 nuts.
Since from your description that it wont engage to cut, you will have to remove and reinstall the chain since it is loose from the drive wheel. Clean out all the wood chips, etc in the drive wheel area before you reinstall the chain, make sure it is not on backwards and sharpen and oil it before you use it. Rick