As you are probably aware, finding literature for these old guns can be frustrating. Here's the first step, a link to an exploded diagram.
Luckily, your gun is a typical pump. Having a fixed barrel, cleaning is a little more complicated and dropping the trigger group is recommended. Check out the exploded drawing and you'll see that like modern pumps, the trigger assembly is restrained by a cross pin. With your gun, the stock is anchored to the trigger group, not the receiver. Perhaps one of the other members can help with specific assembly instructions.
