Husqvarna chainsaw bar bolt loose and leaking oil

Not all 345 machines had an adjustable oiler, it is retro fittable if it does not, however if it hs an adjuster, the screw is located on the bottom of the saw between the cranckcase and the fuel tank, just below the sprocket, there will be an oil symbol and a - and + sign there, the pump is three position, for 13/15/18" bars.

It can be defective. Or not right installed.

Check the sprocket to see if it has very deep groves wore into it.The chain might be getting in and out of the worn grove making it get tight.You also might not be getting enough oil to the chain.If the sprockets ok try cleaning the bar grove out with something like a small flat blade screw driver.There are small oil holes near the bar bolt holes.they need to be cleaned out every so offten.Blowing it out with compressed air helps .You should also flip the bar over every 2 to 3 hours of use.So it doesen't get wore bad on one side.Also try running the saw with the bar off to see if oil is coming out ok.If not your screen inside the oil tank might be plugged up.

This machine has a geared side adjust tensinor, i woud say the gear system may have striped, remove the clutch and drum, remove the allen screw securing the silver bar protector plate, the adjuster will now just lift away complete, check its function, replace if required, check the oiler is working, hold the saw over some cardboard, rev the engine and check to see if there is a good oil spray onto the card.

At the end of the bar there's a small hole. Every time you fill the oil you should also put some oil into that hole and turn the chain so it spreads into the bearing. The chain oil is not intended to be enough for that bearing. I hope that will solve your problem.

Remove the bar and chain. Start the engine and observe the oil delivery port in the side of the engine case. At a fairly fast speed, the oil should ooze out of the port. If little or nothing, check the pump, lines, and in-tank filter. If ok, clean the bar drive-end holes of sawdust and dirt, especially the small passages that go from the large holes out to the chain groove. Clean the entire groove and the outer end sprocket. Reassemble and test the oiling by running the bar tip at speed in front of a piece of cardboard--it should throw off a thin line of oil after several moments. Hope this helps!

An IPL (exploded parts list) for your saw can found here:
HusqvarnaUSA.com
http://www.husqvarna.com/us/homeowner/support/download-manuals/
Serial number decode – for use with IPL
06 1500198
06 = year produced – 2006 (single digit before 2000)
15 = week produced - March
00198 = 198th unit produced by Husky that week

The manual and IPL list no way to change oiler output. Your manual (page 16) says
"If the chain lubrication system is still not working after
carrying out the above checks and associated measures
you should contact your servicing dealer." HTH
Lou
One question - are you using bar oil? It is thicker and stickier than most oils.

You may have a problem with blockage in the oiler system somewhere. Try emptying out all of the bar oil and swishing some gas around in the bar oil tank to clean it out. This will work some of the time. Sometimes you have to take the oiler off and blow thru the lines into the tank,( make sure the oil fill cap is off) and blow into the oil tank out thru the line to clear out any debris . The adjustment for the oil pump should be on the bottom of the saw. Here is the manual with the procedure on page 32 of the manual. Hope that helps you.
http://weborder.husqvarna.com/order_static/doc/HOUS/HOUS2004/HOUS2004_1140235-95.pdf

Turn the Hus 345 chain saw upside down, you may see a little Icon of a oil droplet and a + - arrow by the chain. THe adjustment screw is not pictured in any of the standard user manuals,. but it is a small black slot headed screw over a rectangale metal tab by the chain. I believe if you turn it counter-clockwise, it will give you more oil,, It did for me. If you have the bar off, you can start the saw and see it come out the hole, that would verify your oil pump is working. Make sure the holes on the bar are clean also. running the saw at a fast idle for 1 min should oil the chain well enouth that it starts spraying off the end of the bar when you gun the engine.

Replace the bar. Your bar has gone bad and that is why you are losing power. Bars are made by the chain saws to be completely oiled at all times. When the bar does not get oil the bar will start to warp and that is what will cause you lack of power when trying to due a top cut