Quoted from xTheBlackKnightx:

The heaviest PINBALL machine is Caveman (Gottlieb, 1982) as a System 80A at 400+ lbs all parts installed (uncrated, unpalletized, and unboxed) , and heavier than ALL present JJP games. No BLY/WMS pinball machine ever came close to this weight. It outweighs Hercules and even PK2K due to the older style Happ monitor (for the video game portion), cabinet design, brackets, and added parts.
For the heaviest machine categories, several pitch and bats are easily over 400+ lbs and outweigh bingos and other speciality EMs due to the running man units, extra wood, and components. Bingos generally run in the 300+ lbs arena with several exceptions. Several dual EM gun games are even heavier at 450+ lbs. Single cockpit games can be around 550+ lbs due to the hydraulics. EM ball bowlers can weigh in at up to 650-750 lbs due to the long wood decks and pin mechanisms. Speciality simulators that are NOT single cockpit (think "mini shuttle" size) can be up to a near metric ton (2205 lbs), and never moved as a complete unit.
The "all time" heavyweight of arcade games is Fascination (Taylor Engineering Corporation), when it was installed in multiple banks of 20-50 units. Single EM units start at a little less than 300 lbs each and DOES NOT include the control panel which is close to 450 lbs alone. When 50+ units where operating together (as exampled in 1928) the combined weight was over 7 1/2 tons! This is because most of the parts are based on archaic telephone architecture, early electrics, and a major precursor to late model EM games. There is one game operating near me at Funland Arcade in Seaside, Oregon with 20 units together. It is impress even today. You can see Randy Senna moving individual sections of this game on an episode of Hoarders, which the producers of the show were completely baffled. There are very few left in existance. https://en.wikipedia.org/wiki/Fascination_(game)