A chain saw bar oiler pumps oil up to the bar of the chain saw, which forces the oil into the grooves where it collects. Take a chain saw apart to understand how a chain saw bar oiler works with instructions from an experienced carpenter and construction specialist in this free video on power tools.
Hello my name is Mark Blocker and in this segment we are going to cover how a chainsaw bar oiler works. I have got a chainsaw broken down here with the side cover removed and bolts removed to hold the bar in place so I can gain quick easy access so I can demonstrate. Basically how the system works, the chainsaw will have a holding tank with a cap on it and that's where you fill the oil in it and that reservoir will hold the oil. There is a pump that is driven off the crank shaft sprocket or it could be a mechanical pump off the plunger assembly and that is going to push oil up and it brings it into the bar into this hole and also collects alongside the chain and that is what forces the oil into the groove. All the way around the bar has a groove assembly that the chain rides in and that is how it picks up the oil. I'm going to remove the bar here and here on the chainsaw this long slot here is how the oil is delivered so if I remove this cover plate you can see the pump assembly here that is driven off the crank shaft, this is a clutch assembly that pulls this chain, pushes up, excuse me, it's pushed up through this canal and this block off plate here directs it right into a long slotted assembly where it can pick up in through the hole in the bar. There is a hole on either side of the bar so you can reverse the bar and that forces it up through the groove and to the chain and that lubricates the bar and chain assembly. O'kay so that's how a chainsaw bar oiler works.