Small Engines (Lawn Mowers, etc.): McCullough chain saw, eager beaver 3, mccullough

Question
I have a McCullough chain saw, Eager Beaver, 3.7 cid, 20" bar, model 60013302.  About 20 yrs old.

My question is:Where would I find out what size file I would need for sharpening:  5/32, 3/16 or 7/32?

I have the original box but not manual.

Thanks.

Answer
Hello,

The file size is determind by the chain pitch.  

For Chain Size
1/4", 3/8" LP,   use 5/32 Dia.
.325 -  use 3/16 Dia.
3/8 -   use 13/64
.404 -  use 7/32

As the chain wears smaller you can go to the next size file down if needed.

For tips see:
http://www.chainsawspecialists.co.uk/chain_sharpening.htm

Good Luck,
Michael