Hi Mike, as Jason says about the bolts, but how much/often you'll think you will need to service it, I don't know. I would suggest that a blow out with an air line every now and then, and like Frank says a squirt of oil on all the slidey bits and the thread should do.
If you feel you have to take it apart, it is fairly simply, no real need for any drawings (never sen any myself) just open it up as far as it will go and at the back you should find a pin stopping the nut from comming out of the dovetail.

Then if you turn it over you will see a split pin in front of a washer and spring at the handle end of the moving jaw.

This will have to be removed before you can extract the thread from the nut, but before you unwind it out of the nut you will need to tap out the pin in front of the nut and then using a mallet, tap on the end of the handle to knock the nut out of the dovetail.

The thread can then be wound out and you will then be able to remove the nut allowing the moving jaw to be slide out completly. Reassembly is the reverse procedure as they say. If you are unsure that you can't remember how it all goes back, take photos of each step as you take it apart.
Hope this is helpfull.
Regards Nick.
Edited By Nicholas Farr on 22/07/2014 19:05:43