i disassemble, diagnose, and repair the oiler mechanism in my stihl 025 chainsaw. I replace several parts including the oil pump, worm gear, orings, oil pickup tube and oil pickup.
My saw had an additional problem, the clutch bell had melted away some of the plastic where the oil pump is installed, i had to clean and glue the oil pump holder so it would pump oil well.
see the end of the video for parts diagrams, list and prices of replaced parts.
link to the manual