This is an animation used in Alkota's service school to help educate people on how the head of a triplex plunger pump is assembled/disassembled.

http://www.youtube.com/watch?v=Y5kNpVuBoAA&feature=c4-overview-vl&list=PLKaGYY0CshvrE2m2tl6OxGWZMtFjH9JvD