Chainsaw Repair

Thanks, but I ordered the bearing first thing this morning.

Although all of my oiler parts look to be in good condition,
I got replacement drive wheel, the oiler piston and a new washer that goes under the drive wheel, that was missing.

Other than the missing washer, I really could not find a problem with the whole oiler system.
So it got cleaned up and put back together with the new parts.
Just need the new drum bearing to get things all put back together.
You ask "what happened to the old bearing?"
It disappeared.  Probably got thrown out with a bunch of paper towels while cleaning up.
Par for me.  Try to fix one thing and break or loose another thing. 
I could never make a living as a mechanic.