You need to be more specific and identify a manufacturer and model, i.e. Winchester Model 94, Marlin Model 39, etc. For the most part, you don't want to dissassemble beyond what the owner's manual recommends for cleaning.
marauder.homestead.com
Best left to a trained gunsmith
You really should leave this to a trained gunsmith.
You can download a manual here - http://www.henryrepeating.com/freestuff.cfm
how can i disassemble this gun
You need to find a gunsmith.
If you are not trained to do this, I recommend you do not try it. Chances are better than even you will be taking a box of parts in to a gunsmith and that's not good.
Since there several different makes and models, and they are all different, contact the maker thru their website, and ask for the owner's manual that will show you how.
Marlin 336 Owners Manual at Marlin Firearms website: http://www.marlinfirearms.com/pdfs/manuals/MFC_Centerfire.pdf
Revolvers are not lever action firearms. Sorry- can you rephrase your question? Lever action firearms are most often rifles, rarely shotguns. A very few lever action pistols were made, but not revolvers.
well if you mean as in lever action there is winchesters with lever action ive seen a 10 gauge Winchester with lever action its a fine piece of wor i wish i could have shot it
Try the related link >>>> It doesn't explain HOW it works, but gives the steps to completely disassemble one.