How do I access my Stihl MS170 chain saw oiler? It's approx. 7 years old and will not put out any oil. I've checked the port and it's clear, but I don't know how to get inside to look at the pump, etc and if need be replace any parts as necessary. Pictures of this would be very helpful.

Renovator72, April 2011

.on the MS170 you have to take the handle off,take the throttle rod that goes to the carburator off remove buffer caps and the handle should come off,might have to remove muffler and air filter box to make it easier.Underneath the pump is accessed by popping the rubber suction hose from the engine housing, M5 screw is used to pull the pump out,pump only faces one way .The hose should be resealed using automitive silicon where it goes into housing they pump air instead of oil if not sealed properely has to be clean when you do this.The oil pump drive is under the clutch the worm gear could be damaged or the pick up screen on end of oil line going into oil tank could be blocked

Dave Fix, May 2011

I'd start by ensuring that the Clutch Drum (Behind the Chain drive sprocket.) is engaged with the oil pump.

There are some extremely good maintenance videos on the Stihl US site.

T, April 2011