Quoted from xTheBlackKnightx:
Definately never just use two people to dead carry a machine up or down stairs, it makes backs go out.
Yeah.... the 5 1/2 foot cast iron tub i have was fun to get up stairs. It involved quite a lot of people and I was genuinely worried that my stairs were gonna cave with the combined weight. Luckily the pins stay downstairs. Actually I had one other friend help me move my first one up the three stairs from my garage and he told me not to call him for any others.