Saw runs fine but oiler is not working. I have cleaned the saw, rinsed out the oiler hole and pressurized the oil tank thrue a bolt hole when you remove the muffler. I ran the saw w/out the bar and it still wont oil. Is the oiler adjustable? How do I fix this? Do I need to split the case? How does the oil pump work? Please expalin thouroghly w/ as many steps as possible. I havent done much work w/ chainsaws. I did a search, but didnt come up w/ much info. Thanks ahead of time.. Steve..