Hello Eric

The operator manual is here:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=64934

This is a 17" machine so you will need to look at the frame for cracks.
Yes, the reel sprocket is at the end of its life. They are available.

A competent sharpen and set should see this one running nicely.

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Jack