Hello, New user here looking for some tech tips on removing a bottom bracket from my 25 year old Motiv mountain bike. I've put thousands of miles on this and it's a real beater so I am doing a long overdue tuneup. I'm more of a Singray and cruiser kind of guy so these bottom brackets are a mystery to me. If I'm not mistaken, this is similar to the type used on old Raleigh bikes. Mine has a good amount of slop in it so i want to take it apart for service. I got the nut holding the left crank arm off but no further. Do I need a puller to remove the crank arm? Also, beyond that, how is everything removed? I've enclosed photos and I do happen to have a tool that fits the outer ring with the notches in it.
I've attached a couple of photos. Any help is greatly appreciated.