A B47 is getting long in the tooth now but it was a very quick baler in it's day. How much have you got to do ? 300-400 bales an hour was easy enough when they were set up right. You must have the ram up tight and have both the ram knife and the stationary knife pretty sharp but that's the same on any small baler.
If you have lots of "notches" on the two knives then sharpen the notches.
Is the feed auger and all the area around it nice and shiny ? If it isn't sand all the rubbish off an don't forget to clean and oil everything, including the complete chamber, when you've finished for the season. That material needs to fly up the pickup reel, under the auger and into the chamber almost on it's own without the packers and it will do if everything is nice and shiny and it's a warm and sunny day.
