Knobs on Chain Saw for ?

I bought an old Sears 14" electric chainsaw model 315.34160 at a garage sale and cannot locate and online source for an instruction manual for it. I have used it several times after installing a new chain, and it cuts great, but cannot figure what one of the controls is. There are three knobs: One is a silver pushbutton that seems to manually pump oil onto the chain. A knob just next to it has to be the filler cap for the bar oil, and I have filled it. Right next to the filler cap is a black knob mounted on a threaded machine screw, that just moves up and down when unscrewed/screwed. What is that for? I was guessing it might set the rate of the oil flow with each button push, but that was just a guess. Also, how often does one need to manually push the button, in a typical cutting session? I pushed it every couple of minutes, and it overoiled the chain, causing sprayback. Also, any hitnts about where to find a manual would be welcome.
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Is it possible that the knob is to adjust the chain tension?

sale
have
filled
any
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would you like to sell it?
I have a craftsman chain saw with an AUTOMATIC SHARPENER...
with the chain turning, you press the button and it sharpens the top of the chain.
does not do the sharpening that a round file can do...
turn it down as the chain and stone wear...
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Phil, I took off the sharpener attachment, on the advice of the chainsaw repair shop. He said it was nearly useless compared to using the usual round file for this purpose. Roger

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OK Roger, here is exactly what to do:
Go to this Sears parts website: http://www3.sears.com/ Enter in your number 315.34160 for your electric chainsaw in field number 2 entitled "Type in your model number. Click on "go". Then click on "Continue" on the next screen which verifies that you are looking at the right machine. On the next page click on the View Diagram radio button, then continue, and another window opens with every part on your machine shown with a part number in an exploded view. Now back on the original window click on the View Part List radio button, then continue, and you see the name for each one of those parts. Now just switch back and forth between these two windows and you can identify every single part on your electric chainsaw.
Easy as cake. (I have been doing this recently as I have been fixing up our Kenmore washer, dryer and fridge...) Hope this helps, Tomes

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Thanks for the pointer. Excellent. Yes, that diagram ID's the silver button as the pump, as I expected, and the cap as the filler cap, so that indeed must be for the oil. On the mystery knob, it is still not clear what it does, it is just called an "adjustment knob". Just *What* it adjusts is not clear. Next time I go into the chainsaw repair shop, I'll ask the guy there. Thanks again. Roger
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If it says "adjustment" and there isn't another part that says something like "chain tensioner" then that's probably what it is, since there has to be one somewhere...
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Do you not think that it once adjusted the sharpener before you removed it?
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Glad it helped Roger. I am betting on it being the chain tensioner like the other folks here. Since you now have my curiosity up, please let us know what you find out, thanks. Tomes

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