First you loosen 2 bar nuts , then tighten adjuster screw ,this is on cover behind bar nuts or between bar nuts or inside bar on crankcase depending on what model you have ,its also helpfull to lift nose of bar while you tighten adjuster,dont over tighten chain ,then tighten bar nuts
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Tom, Check the attached links,instruction and guides on Husqvarna chainsaw, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." Husqvarna rancher 55 chain bolt replacement
as chain saws operate in bad conditions , check the air filter for blockage
as there are many carby's on the market with screw adjustments or no adjustments , exactly what make and model would be a big help
Here is a helpful link for the owners manual and maintenance guides. The chain should be tight, but still have some movement when you lift the chain from the guide, however the bottom links should not come out of the guide.
if you are talking about the bar chain oil (?) --- then all you need is just that ' bar/chain oil ' ,, you can get it from any hardware store that sells chainsaws.
now out here in the middle of nowhere Alaska where I am,, we just use used motor oil from our generators as a bar chain lube and it works just fine, ( not my ideal thing to use , but that is what the boss says to use and after 3 years here and using it -- I have not had any issues with our 4 saws that get over 3000 hours of use every year ).
I say -- use only good,clean and new bar chain oil.
Assuming you can pull the starter cord and the engine turns freely (e.g. engine not frozen due to improper fuel mixture), check for debris near the clutch wheel. Also, loosen the bar tension screw to see if the chain and clutch can move.
If you pull the starter cord and the chain moves, your clutch may either be jammed in the engaged position or may have gone out.
Make sure that you don't have the chain tension too tight and that you always have plenty of bar oil.
please excuse my english.There are two locknuts on the cover of the chain sproket(release them a little)Now you have to find the screw to adjust chain tightening.It is in front or on the right side of the chain cover.For tightening move the screw clockwise andthen tighten the locknuts.