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How do I alter the chain tension?

I have a Stihl 010av chainsaw but I cannot find the adjustment screw for the blade, there is a bolt which alters the angle of the blade is this it?
terence, January 2006
There is a Pan Head Screw at the front of the saw next to the blade. This turns a tensioning nut that locks into one of the holes in the chain bar. It turns clockwise to tension, and anti-clockwise to loosen.
If the screw isn't there, the pan head nut won't be either, not will the sleeve which goes on the Pan Head Screw as a spacer.
(The Pan Head Screw is a M5x50)
Stihl part number for this are:
Pan Head Screw 9043-319-8100
Sleeve 1120-664-2600
Pan Head Nut 1120-664-1500

mike, May 2006