You can get a copy of the owner's manual from Marlin. There are instructions on the breakdown procedures in it. Try their website
http://www.marlinfirearms.com/If that doesn't work, let me know and I will scan the pages from my copy. I had to take mine apart 2 years ago for a thorough cleaning because the lever would not seat properly and I was having trouble shooting.
Went to their site and got the snail mail address for you.
How can I get a product catalog or Owner's Manual?
To obtain an Owner's Manual
Please send your name and address to:
Marlin Services
P.O. Box 248
North Haven, CT 06473
Be sure to specify the model name and serial number of the specific firearms.
Steve