Chainsaw Repair

They have an impulse driven diaphragm type auto oiler.  It's in the same housing as the manual oiler pump.  The diaphragm is thankfully a simple one without any metal parts riveted to it.  Allows us to cut our own diaphragms out of suitable material if needed. 

There's a square section o-ring (called a quad ring by Poulan) in the manual oiler.  When it fails the oiler doesn't work right.  Sucks air and/or leaks.  AFAIK there was never any updates/changes to the oilers in this series.

Supposedly, the early 3400's had an adjustable auto oiler pump......................but I've never seen any evidence of that (in the SM, IPL's, in person, or in pics).