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CHAIN STRETCHS AS IT HEATS - KEEP CHAIN TIGHTENED CORRECTLY AND ALWAYS KEEP OIL IN OILER AND MAKE SURE IT OILS THE CHAIN. IF THIS DOESN'T FIX - REPLACE THE CHAIN. IF IT STILL HAPPENS THEN REPLACE BAR. WILL FAIL AGAIN WITHOUT OIL. POULAN WILL NOT HOLD UP WITHOUT CHAIN LUBRICATION. WORSE THAN OTHERS. IF CHAIN OR BAR OVERHEATED YOU'LL WORK ON IT MORE THAN YOU CUT. OIL IS THE KEY TO CUT WITH A POULAN!
The oil pump is run by a worm gear that will strip easily if the oil pump becomes clogged. You'll have to remove the bar and do some disassembly on the saw, but it is possible to fix. You can buy the replacement parts kit (that comes with an instruction sheet) from poulan for about 20 bucks, just call the number on the saw.
You shouldn't need any other oil than the oil to keep the chain and bar guide oiled (pressing down on the button adds more oil to the chain/bar). You can use standard Bar and Chain Oil, or probably pay a little more and use the Poulan brand oil, but in my experience, any bar oil for chainsaws will work, and the larger the container you buy, the less per ounce you will pay. Remember this is NOT an automatic oiling system, so it will be cheaper in the long run to remember to press that button than to replace the chain/saw if it overheats.
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!