No oil flows to chain... - Husqvarna "Chain Saw - 16" Bar, 3 Hp

Interesting.
Chain lubrication is critical to the life of the bar and chain.
I'd be suspicious that you may not be using heavy viscosity chain lubrication oil.
Light weight oil will flow much faster.

ive not done much with this model but I can give you some basics on why I see lots of chainsaws loose there oiling of bar
(1) Wrong oil used in supply tank- most all chain saws take 30 wt bar chain oil . this is a lite/fine oil and needs to be so it flows thru small ports and pump on saws
(2) fine sawdust in supply tank - I guess anything can fall in the tank but I do find theres a lot of junk that falls in there over time , if it don't flow like oil does then it don't belong in the tank
(3) sawdust jammed in bar ports this id say is the biggest one I find , seems sawdust (all different size pieces) finds its way into the fine ports that oil is suppose to flow thru , sawdust mixed with oil makes a darn fine plug !!!

other than these simple things above , most saws have lots of parts that can break and fall off look for something just not right looking and sometimes it will be very obvious whats missing

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

Check to see if a piece of the chain tensioner broke off and is plugging and oil port or line.

Have you cleaned the oiling hole in the guide bar.? Scrape out the full length of the guide bar using a cleaning tool. There is an oiling hole at the back of the bar on either side which the oil flows into.

Is oil being pumped out the saw.? Remove side casing and guide bar, run the saw and check the flow.

Most hobby saws do not have an adjustable pump, if it is adjustable there will be an external screw close the the clutch and sprocket, would would not need to remove the bar and chain to acsess it.

cellphone

Remove the nuts that hold the clutch cover on, Then remove the bar and chain. Make sure the port hole in the bar is open for the oil to flow into the chain groove. The oil ports can get plugged by sawdust and chips. Bar oil is sticky. The bar and chain should be removed and cleaned on a regular basis. Clean the groove in the bar too. Also make sure the port on the saw body is open. Start the saw with the bar and chain removed, if oil doesn't flow from the port, then you have a faulty oil pump and will need to go in deeper to replace the pump parts.
Always use proper clean chainsaw bar oil. Using other types of oil can burn up your oil pump.

The filter can usually be caught with a hooked wire and drawn up far enough to deal with the filter. Oil filters are not prone to plugging unless the oil used is contaminated. If you run the engine without the bar and chain attached, oil should ooze out of the engine side port. If nothing, suspect problems with the oil pump. Some saws use a plastic gear in the pump and can strip the teeth of the gear. You should find it located behind the clutch assembly. Once you have oil flowing from the engine, clean the bar drive-end oil ports that go from the large holes out to the chain groove on each side. Finally, run the bar tip near some cardboard--it should throw off a thin line of oil. I have no idea what the plastic tube might be (a manual pumper perhaps?). Hope this helps!