Stihl 009 Instruction Manual - Page 39

Removing oil pump Component parts of oil pump in correct sequence 1 3 10 4 5 2 9 786 2 125BA024 LA 125BA025 LA If you have checked chain lubrication (see chapter "Guide Bar, Saw Chain and Chain Sprocket") and found that no oil is being delivered although the oil tank is full, switch off the engine and start looking for the fault on the cutting attachment. To do this, remove the chain sprocket cover, guide bar and chain. Thoroughly clean the oil inlet holes as well as the passage between the holes and the bar groove. Also clean away dirt that may have collected at the end of the oil hose and the area around it. Now check oil delivery again. If no oil emerges from the hose , the oil pump must be removed from the machine and cleaned. Drain the chain oil tank. Remove the fastening screws and withdraw the oil pump. If the oil pump is stuck, use a screwdriver to carefully pry it away from the crankcase. Pull off the hose and remove the polymere disc . Take the filter off the stub. Now pull the cover off the pump housing, making sure that the diaphragm does not stick to the cover and tear. Take the plunger and diaphragm out of the pump housing and remove the two gaskets Note the spring between the pump housing and diaphragm. It must not be lost. Carefully wash the pump housing, cover, plunger with diaphragm and the filter in clean gasoline. Thoroughly clean the gaskets and flange faces on the crankcase. Reassemble the pump by reversing the above sequence. Coat the plunger with a little lubricating oil before refitting.