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There bar oil seal is not that great it wears out right away and leaks instead of squirting oil when you pump it.
Don't worry 80 % of all chain saw leak sooner or later. Just put oil when you use it then drain it when you store it.
to test if your oiler is functional remove bar and chain and start unit. if it drips oil with bar and chain off then clean the oil hole in the bar. if plugged it will prevent oil from reaching bar for lubrication of chain
Most are abel to be greased, wich helpes. Sounds like its it here not oiling right. When you start up place the nose of the bar near something dry and what to see a oil spaying of the bar . If that's ok,double check you aren't over tittering the chain.
You may have gotten some saw dust particles inside the oil resevoir that got sucked into the delivery tube, thus clogging up the oiler...you can drain the oil out of resevoir and run some seafoam thru the oil resevoir to see if you can get it unclogged
Husqvarna are reknown for this, remove the pump and pick up pipe with the filter on, slip a rubber o ring the correct size onto the hose, this will space the hose out the distance of the o ring and create a better seal against the oil pump body.
Fill the tank with petrol, this is much thinner than chain oil so you should very quickly see where the leak is.
There is no adjuster for the Husqvarna 450. Husqvarna recommend that if there's not enough oil reaching the bar that you slow down the engine by adjusting the carburettor screw. I have the same saw and also wanted to adjust the oil flow. I didn't change the carburettor and it's still cutting away without doing any damage. It's meant to use less than a tank full of oil to the tank full of fuel when you're cutting near constantly. With stops in between it will use more fuel and less oil.
The bar and chain require bar oil (only) to be placed in the capped tank. The motor itself is air cooled, and should be blown out with compressed air often to remove the accumulated sawdust. Make sure the chain is tightened just enough to prevent the lower part of the chain from drooping from the bar and can be turned by hand. Make sure to keep the chain teeth sharp by properly filing for best cutting. Test the chain oil pump operation by running the saw with the chain tip near a piece of cardboard--it should throw off a thin line of oil after a moment or two of running. Hope this helps!
Oil System Plugged. Remove the clutch cover, bar and chain. Clean the oiler hole and channel. Start the saw and see if it oils when revved up. If yes reassemble your saw. If no a blunted, hooked piece of wire can be used to pull the hose in the oil tank out. I recommend the filter be replaced. Work your way through the linkage cleaning and replacing any defective parts as you go. Carefully check the hoses for cracks especially at bends and connections. If equipped with an oil pump it is usually behind the clutch (clutch is probably left handed thread). Please make extensive notes & some digital pictures will help during reassembly. GL Lou